Pub Date : 2001-10-01DOI: 10.1080/10587250108030067
Kyung Lim Paik, Hwan-Kyu Kim
Abstract We have investigated the development of lanthanide-cored supramolecular complexes containing porphyrins to circumvent the solubility problem and maximize the optical amplification properties. Their chemical structures were identified by FT-IR, 1H-NMR, UV-Vis absorption and emission spectroscopies. FB-Por 1 and 2 show a very intense UV-visible absorption band at 419 nm, which is attributed to the Soret band. In addition, the relatively weak bands at 516, 551, 591 and 647 nm are assigned to the Q bands. Upon a photoexcitation wavelength with 430 nm, the PL spectra of FB-Por 1 and 2 exhibit a strong band at 653 nm and a weak peak at 715 nm. Zn-Por 1 and 2 show a very intense band at 420 nm for B-band π∽π* transitions. In addition, the weak bands at 547 and 585 nm were assigned to the Q bands. With an excitation wavelength of 430 nm, the PL spectra of Zn-Por 1 and 2 show a moderate band at 596 nm and a strong band at 646 nm.
{"title":"Synthesis and Luminescent Properties of Lanthanide-Cored Supramolecular Complexes Based on Porphyrins for Optical Amplification","authors":"Kyung Lim Paik, Hwan-Kyu Kim","doi":"10.1080/10587250108030067","DOIUrl":"https://doi.org/10.1080/10587250108030067","url":null,"abstract":"Abstract We have investigated the development of lanthanide-cored supramolecular complexes containing porphyrins to circumvent the solubility problem and maximize the optical amplification properties. Their chemical structures were identified by FT-IR, 1H-NMR, UV-Vis absorption and emission spectroscopies. FB-Por 1 and 2 show a very intense UV-visible absorption band at 419 nm, which is attributed to the Soret band. In addition, the relatively weak bands at 516, 551, 591 and 647 nm are assigned to the Q bands. Upon a photoexcitation wavelength with 430 nm, the PL spectra of FB-Por 1 and 2 exhibit a strong band at 653 nm and a weak peak at 715 nm. Zn-Por 1 and 2 show a very intense band at 420 nm for B-band π∽π* transitions. In addition, the weak bands at 547 and 585 nm were assigned to the Q bands. With an excitation wavelength of 430 nm, the PL spectra of Zn-Por 1 and 2 show a moderate band at 596 nm and a strong band at 646 nm.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"24 1","pages":"185 - 188"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83257064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030060
K. Lee, Jong Hyoup Lee, Haeyoung Choi, M. Cha, M. Chung, Young Jun Kim, Sang-Don Jung
Abstract High two-photon absorption (TPA) molecule having a fluorene π-center (TP-Flu-TP) was prepared by the Heck reaction of 2,7-dibromo-9,9-diethylhexyl-9H-fluorene and 4-(diphenylamino)benzstyrene. The linear absorption maximum of the TP-Flu-TP was observed at 410 nm. The dispersion of the TPA intensity for the chromophore was measured by nonlinear transmission using 7 ns laser pulse. Since the maximum wavelength of this molecule occurred at 740 nm, we fixed the pumping wavelength at 740 nm for TP-Flu-TP and measured the transmitted pulse energy versus the input pulse energy. From this experiment we observed a distinct nonlinearity from TP-Flu-TP demonstrating that it is a potential material for optical limiting. The calculated two-photon absorption cross section (Δ) by the Hartree-Fock Hamiltonian with single configuration interaction formalism was 1.37 × 10−47 cm4 sec/photon.
{"title":"Fluorene-Based Organic Molecule with High Two-Photon Absorption Activities","authors":"K. Lee, Jong Hyoup Lee, Haeyoung Choi, M. Cha, M. Chung, Young Jun Kim, Sang-Don Jung","doi":"10.1080/10587250108030060","DOIUrl":"https://doi.org/10.1080/10587250108030060","url":null,"abstract":"Abstract High two-photon absorption (TPA) molecule having a fluorene π-center (TP-Flu-TP) was prepared by the Heck reaction of 2,7-dibromo-9,9-diethylhexyl-9H-fluorene and 4-(diphenylamino)benzstyrene. The linear absorption maximum of the TP-Flu-TP was observed at 410 nm. The dispersion of the TPA intensity for the chromophore was measured by nonlinear transmission using 7 ns laser pulse. Since the maximum wavelength of this molecule occurred at 740 nm, we fixed the pumping wavelength at 740 nm for TP-Flu-TP and measured the transmitted pulse energy versus the input pulse energy. From this experiment we observed a distinct nonlinearity from TP-Flu-TP demonstrating that it is a potential material for optical limiting. The calculated two-photon absorption cross section (Δ) by the Hartree-Fock Hamiltonian with single configuration interaction formalism was 1.37 × 10−47 cm4 sec/photon.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"2 1","pages":"155 - 159"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78772122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024741
Hooi-Sung Kim, T. Heo, Mi-Ra Kim, C. Ha, Jin-Kook Lee
Abstract Optical properties of polyimide film with dispersed metalloporphyrin (ZnTPDPI) and those of polyimide film containing tetraphenyl-porphyrinzinc in polymer backbone (POTPPI) were compared. For ZnTPDPI, the increase of the content of ZnTPP in PI film exhibited the increase of absorption and emission. POTPPI showed higher emission and absorption than ZnTPDPI. Relative fluorescence quantum yield of POTPPI was 0.218, while that of ZnTPDPI was 0.125.
{"title":"Comparison of Optical Properties of Porphyrin Dispersed Polyimide and Porphyrin Incorporated Polyimide into the Main Chain","authors":"Hooi-Sung Kim, T. Heo, Mi-Ra Kim, C. Ha, Jin-Kook Lee","doi":"10.1080/10587250108024741","DOIUrl":"https://doi.org/10.1080/10587250108024741","url":null,"abstract":"Abstract Optical properties of polyimide film with dispersed metalloporphyrin (ZnTPDPI) and those of polyimide film containing tetraphenyl-porphyrinzinc in polymer backbone (POTPPI) were compared. For ZnTPDPI, the increase of the content of ZnTPP in PI film exhibited the increase of absorption and emission. POTPPI showed higher emission and absorption than ZnTPDPI. Relative fluorescence quantum yield of POTPPI was 0.218, while that of ZnTPDPI was 0.125.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"27 1","pages":"281 - 284"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87587092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030087
R. Yuge, A. Miyazaki, T. Enoki, E. Ito, F. Nakamura, M. Hara
Abstract Self-assembled monolayer of mesoscopic size with Tetrathiafuluvalene (TTF) skeleton has attracted because it is expected to have quantum size effect for perpendicular to the substrate as well as two-dimensional π-electron interaction. Surface plasmon resonance (SPR) revealed that TTF-CH2SH monolayer is formed on Au (111) only at proper concentration. The presence of etch pits which is characteristic to chemisorbed SAMs was confirmed by scanning tunneling microscopy (STM). From those SPR and STM results, it has been suggested that the molecular long axis of TTF-CH2SH was aligned nearly perpendicular to the substrate. In addition, cyclic voltammogram (CV) result indicates that TTF-thiolate SAMs on gold electrode are stable in repeated scans.
{"title":"Characterization and Electronic Properties of TTF SAMs on Au (111)","authors":"R. Yuge, A. Miyazaki, T. Enoki, E. Ito, F. Nakamura, M. Hara","doi":"10.1080/10587250108030087","DOIUrl":"https://doi.org/10.1080/10587250108030087","url":null,"abstract":"Abstract Self-assembled monolayer of mesoscopic size with Tetrathiafuluvalene (TTF) skeleton has attracted because it is expected to have quantum size effect for perpendicular to the substrate as well as two-dimensional π-electron interaction. Surface plasmon resonance (SPR) revealed that TTF-CH2SH monolayer is formed on Au (111) only at proper concentration. The presence of etch pits which is characteristic to chemisorbed SAMs was confirmed by scanning tunneling microscopy (STM). From those SPR and STM results, it has been suggested that the molecular long axis of TTF-CH2SH was aligned nearly perpendicular to the substrate. In addition, cyclic voltammogram (CV) result indicates that TTF-thiolate SAMs on gold electrode are stable in repeated scans.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"25 1","pages":"273 - 276"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85797121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030022
D. Sandman
{"title":"A Review of “The New Chemistry” editor-in-chief Nina Hall, Cambridge University Press, 2000; ISBN 0 521 45224 4; xi + 493 pages; $49.95","authors":"D. Sandman","doi":"10.1080/10587250108030022","DOIUrl":"https://doi.org/10.1080/10587250108030022","url":null,"abstract":"","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"20 1","pages":"273 - 273"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78904411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024744
Jongsun Lim, Hyungjun Cho, G. Park
Abstract Electro-optical measurements of ferroelectric copolymers of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) with VDF molar contents of 72 mol% and 50 mol% have been studied. Through the study of the relaxation dynamics of the EO coefficient for the P(VDF/TrFE) copolymer, it was found that the poling process improve temporal stability of P(VDF/TrFE) 50/50 mol% poled at room temperature and 72/28 mol% copolymer poled at near Tc.
{"title":"Electro-Optical Measurements of Ferroelectric Copolymers of Vinylidene Fluoride and Trifluoroethylene","authors":"Jongsun Lim, Hyungjun Cho, G. Park","doi":"10.1080/10587250108024744","DOIUrl":"https://doi.org/10.1080/10587250108024744","url":null,"abstract":"Abstract Electro-optical measurements of ferroelectric copolymers of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) with VDF molar contents of 72 mol% and 50 mol% have been studied. Through the study of the relaxation dynamics of the EO coefficient for the P(VDF/TrFE) copolymer, it was found that the poling process improve temporal stability of P(VDF/TrFE) 50/50 mol% poled at room temperature and 72/28 mol% copolymer poled at near Tc.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"28 1 1","pages":"293 - 296"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80121056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024688
Jiyoung Kim, Y. Oh, E. Son, Jin Un Kim, Burm-Jong Lee
Abstract A ligand exchange of trichloro-2,2′-dipyridylstearylamine ruthenium(III) (Ru(dps)Cl3) monolayer was investigated at the air-water interface and in the LB film. The optical image of the monolayer was monitored by Brewster angle microscopy. When the monolayer was spread on alkaline subphase (pH 11), the surface pressure spontaneously increased up to 15 mN/m. The λmax around 550 nm of UV-Vis absorption spectra of Ru(dps)Cl3 in chloroform was shifted to around 670 nm in the LB film. The FT-IR spectra of the LB films also supported the two-dimensional ligand exchange of chloride to water or hydroxide ions.
{"title":"Monolayer Properties of a Dipyridyl Coordinated Ruthenium Compound","authors":"Jiyoung Kim, Y. Oh, E. Son, Jin Un Kim, Burm-Jong Lee","doi":"10.1080/10587250108024688","DOIUrl":"https://doi.org/10.1080/10587250108024688","url":null,"abstract":"Abstract A ligand exchange of trichloro-2,2′-dipyridylstearylamine ruthenium(III) (Ru(dps)Cl3) monolayer was investigated at the air-water interface and in the LB film. The optical image of the monolayer was monitored by Brewster angle microscopy. When the monolayer was spread on alkaline subphase (pH 11), the surface pressure spontaneously increased up to 15 mN/m. The λmax around 550 nm of UV-Vis absorption spectra of Ru(dps)Cl3 in chloroform was shifted to around 670 nm in the LB film. The FT-IR spectra of the LB films also supported the two-dimensional ligand exchange of chloride to water or hydroxide ions.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"30 1","pages":"63 - 66"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87755325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030110
K. Okamoto, Tomoaki Tojo, H. Tada, M. Terazima, K. Matsusige
Abstract Microscopic patterning on polysilane thin film was observed after photoexcitation with an optical interference pattern using a nanosecond pulsed laser. The patterning processes were monitored by the diffraction of the probe beam. The observed diffraction signals consist of the transient grating component due to the temperature change and the permanent grating component due to a chemical reaction. It was found that the microscopic pattern was destroyed with prolonged laser radiation. The created microscopic pattern was observed by the optical microscope.
{"title":"Microscopic Patterning on the Polysilane Films by the Laser Induced Grating Technique","authors":"K. Okamoto, Tomoaki Tojo, H. Tada, M. Terazima, K. Matsusige","doi":"10.1080/10587250108030110","DOIUrl":"https://doi.org/10.1080/10587250108030110","url":null,"abstract":"Abstract Microscopic patterning on polysilane thin film was observed after photoexcitation with an optical interference pattern using a nanosecond pulsed laser. The patterning processes were monitored by the diffraction of the probe beam. The observed diffraction signals consist of the transient grating component due to the temperature change and the permanent grating component due to a chemical reaction. It was found that the microscopic pattern was destroyed with prolonged laser radiation. The created microscopic pattern was observed by the optical microscope.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"71 1","pages":"379 - 382"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87215327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108024728
H. Baac, Jae-Hong Park, S. Lee, Suk Hoon Kang, D. Choi
Abstract A novel control of the grating efficiency in a nematic liquid crystal cell with an azobenzene polymer surface is proposed. In an optical control regime, the grating effect can be controlled by alternate polarization switchings of one pump beam due to strong polarization sensitivity of azobenzene chromophores. Moreover, the grating efficiency can be easily tuned by an external ac electric field.
{"title":"Optical and Electro-Optical Control of Grating Efficiency in a Nematic Liquid Crystal Cell with Azo Polymer Boundary","authors":"H. Baac, Jae-Hong Park, S. Lee, Suk Hoon Kang, D. Choi","doi":"10.1080/10587250108024728","DOIUrl":"https://doi.org/10.1080/10587250108024728","url":null,"abstract":"Abstract A novel control of the grating efficiency in a nematic liquid crystal cell with an azobenzene polymer surface is proposed. In an optical control regime, the grating effect can be controlled by alternate polarization switchings of one pump beam due to strong polarization sensitivity of azobenzene chromophores. Moreover, the grating efficiency can be easily tuned by an external ac electric field.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"1 1","pages":"227 - 230"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84613460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2001-10-01DOI: 10.1080/10587250108030054
Chuong-Han Kim, D. Kim, Jong Hyoup Lee, K. Lee
Abstract New liquid crystalline polymers with spiropyran derivative for optical recording applications were prepared by radical polymerization from two different monomers composed of mesogenic unit and spiropyran moiety. The resulting polymers have been characterized by FT-IR, 1H-NMR, DSC and UV/Vis spectroscopy. The weight average molecular weight (M w ) of polymers were in the range of 13,000–30,700 and thermal decomposition initiated in the range of 350-370°C. Good quality films were obtained by spin-coating onto indium tin oxide (ITO) glass plate and some of polymers exhibited smectic and nematic liquid crystalline phase at elevated temperatures. These polymers showed promising photochromic and thermochromic activities for optical recording materials.
{"title":"Photochromism of Liquid Crystalline Polymers with Spiropyran Derivatives","authors":"Chuong-Han Kim, D. Kim, Jong Hyoup Lee, K. Lee","doi":"10.1080/10587250108030054","DOIUrl":"https://doi.org/10.1080/10587250108030054","url":null,"abstract":"Abstract New liquid crystalline polymers with spiropyran derivative for optical recording applications were prepared by radical polymerization from two different monomers composed of mesogenic unit and spiropyran moiety. The resulting polymers have been characterized by FT-IR, 1H-NMR, DSC and UV/Vis spectroscopy. The weight average molecular weight (M w ) of polymers were in the range of 13,000–30,700 and thermal decomposition initiated in the range of 350-370°C. Good quality films were obtained by spin-coating onto indium tin oxide (ITO) glass plate and some of polymers exhibited smectic and nematic liquid crystalline phase at elevated temperatures. These polymers showed promising photochromic and thermochromic activities for optical recording materials.","PeriodicalId":18940,"journal":{"name":"Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals","volume":"25 1","pages":"131 - 134"},"PeriodicalIF":0.0,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84662618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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