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Theoretical study of reaction of urea with methylamine: nucleophilic addition pathway 尿素与甲胺反应的理论研究:亲核加成途径
IF 1.7 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-11-25 DOI: 10.1007/s00214-023-03074-w
Ekaterina P. Kozhanova, Yakov D. Samuilov, Alexander Y. Samuilov

The B3LYP and wB97XD density functional methods were used to study the mechanisms and thermodynamic parameters of the activation and reactions of non-catalytic and catalyzed by phenol and p-toluenesulfonic acid reactions of urea with methylamine. The interaction proceeds stepwise with the intermediate formation of N-methylurea. The non-catalytic interaction has a large activation barrier. In the case of participation of methylamine dimer, the activation barrier decreases, but, nevertheless, remains high. During catalysis by phenol and p-toluenesulfonic acid, compounds exhibiting biphilic properties, the activation barrier decreases. The greatest decrease in the activation barrier is observed during catalysis with p-toluenesulfonic acid.

采用B3LYP和wB97XD密度泛函方法研究了非催化、苯酚催化和对甲苯磺酸催化尿素与甲胺反应的活化和反应机理及热力学参数。随着n -甲基脲的中间生成,相互作用逐步进行。非催化相互作用具有较大的激活势垒。在甲胺二聚体参与的情况下,激活势垒降低,但仍然很高。在苯酚和对甲苯磺酸的催化作用下,具有亲和性的化合物的活化势垒降低。在对甲苯磺酸催化过程中,活性势垒的降低幅度最大。
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引用次数: 0
QTAIM based descriptors for the classification of acrylates 基于QTAIM的丙烯酸酯分类描述符
IF 1.7 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-11-22 DOI: 10.1007/s00214-023-03034-4
David A. Rincón, Ana J. Escorcia, Markus Doerr, Martha C. Daza

Acrylates are used in cosmetics, orthopedics, paints, coatings, adhesives, textiles, and biomedical applications such as contact lenses and bone cements. However, some acrylates are mutagenic and the aim of this article is to explain the mutagenicity in terms of the atomic population redistribution in the molecule using two new descriptors which are based on atomic populations framed in the quantum theory of atoms in molecules. They describe the electron-withdrawing effect of a group of atoms in a molecule. The descriptors consider substituents of prop-2-enoates, the number of the acrolein units and the electrophilicity. The cluster analysis using these descriptors allows to classify acrylates in terms of the number of acrolein backbones and the type of the substituent group. Five main groups can be distinguished: monoacrylates with monomethacrylates, diacrylates with dimethacrylates, triacrylates, trimethacrylate and monoacrylates with electron-rich substituents. The substituents of mutagenic acrylates are electron withdrawing. This makes the acrolein backbone β-carbon more electrophilic and the molecule more reactive.

丙烯酸酯用于化妆品、骨科、油漆、涂料、粘合剂、纺织品和生物医学应用,如隐形眼镜和骨水泥。然而,一些丙烯酸酯具有诱变性,本文的目的是利用基于分子原子量子理论框架中的原子居群的两个新的描述符,从分子中原子居群的重新分布来解释其诱变性。它们描述了分子中一组原子的吸电子效应。描述符考虑了2-丙烯酸的取代基、丙烯醛单元的数目和亲电性。使用这些描述符的聚类分析可以根据丙烯醛骨架的数量和取代基的类型对丙烯酸酯进行分类。可以区分出五大类:单丙烯酸酯类与单甲基丙烯酸酯类、二丙烯酸酯类与二甲丙烯酸酯类、三丙烯酸酯类、三甲基丙烯酸酯类和富电子取代基单丙烯酸酯类。诱变丙烯酸酯的取代基是吸电子的。这使得丙烯醛主链β-碳更亲电,分子反应性更强。
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引用次数: 0
Effect of Ge-doping on the adsorption of anions (F−, Cl−, Br−) onto the outer surface of boron nitride nanotube: a DFT study 锗掺杂对氮化硼纳米管外表面阴离子(F−,Cl−,Br−)吸附的影响:DFT研究
IF 1.7 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-11-15 DOI: 10.1007/s00214-023-03072-y
Marziyeh Mohammadi, Fahimeh Alirezapour, Azadeh Khanmohammadi

In this study, the adsorption behavior of anions (F, Cl, Br) on the surface of the single-walled boron nitride nanotube (SWBNNT) is explored using density functional theory (DFT). The interaction between the ions with the pristine BNNT and the Ge-doped BNNT is performed in the solution phase. According to the obtained data, the F@BNNT and F@Ge-BNNT systems have the highest adsorption energy with values of − 329.85 and − 344.71 kJ/mol, respectively. On the other hand, the lowest values have been shown in Cl@BNNT and Cl@Ge-BNNT structures with values of − 31.17 and − 57.79 kJ/mol, respectively. During the complexation, a decrease in the energy gap (Eg) is accompanied by an increase in the reactivity and electrical conductivity. The HOMO–LUMO energy gaps are found to be the lowest in F@Ge-BNNT with 5.311 eV followed by Cl@Ge-BNNT and Br@Ge-BNNT with 5.299 eV and 5.293 eV, respectively, while these values are 8.028, 8.048, and 7.992 eV for F@BNNT, Cl@BNNT and Br@BNNT, respectively. The intermolecular interactions between the species are also evaluated using the natural bond orbital (NBO) analysis. Finally, to confirm the obtained results, the calculated density of states is depicted.

本研究利用密度泛函理论(DFT)研究了负离子(F−,Cl−,Br−)在单壁氮化硼纳米管(SWBNNT)表面的吸附行为。离子与原始BNNT和掺杂ge的BNNT之间的相互作用在溶液中进行。所得数据表明,F−@BNNT和F−@Ge-BNNT体系的吸附能最高,分别为−329.85和−344.71 kJ/mol。另一方面,Cl - @BNNT和Cl - @Ge-BNNT结构的电能谱值最低,分别为- 31.17和- 57.79 kJ/mol。在络合过程中,能隙(Eg)的减小伴随着反应性和电导率的增加。发现F−@Ge-BNNT的HOMO-LUMO能隙最小,为5.311 eV,其次是Cl−@Ge-BNNT和Br−@Ge-BNNT,分别为5.299 eV和5.293 eV,而F−@BNNT、Cl−@BNNT和Br−@BNNT的HOMO-LUMO能隙分别为8.028、8.048和7.992 eV。用自然键轨道(NBO)分析了两种化合物之间的分子间相互作用。最后,为了验证得到的结果,给出了计算得到的态密度。
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引用次数: 0
Diastereoselective green synthesis of pyrrolo[1,2-a]quinolines via [3+2] cycloaddition reaction: insights from molecular electron density theory [3+2]环加成反应非对映选择性绿色合成吡咯[1,2-a]喹啉类化合物:来自分子电子密度理论的见解
IF 1.7 4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-11-15 DOI: 10.1007/s00214-023-03068-8
Haydar Mohammad-Salim, Asmita Mondal, Jesus Vicente de Julián-Ortiz, Nivedita Acharjee

The [3+2] cycloaddition (32CA) reaction between cyclic azomethine ylide (generated from N-phenacylquinolinium bromide) and N-arylmaleimide, leading to pyrrolo[1,2-a]quinolone, has been investigated using the Molecular Electron Density Theory at the B3LYP/6-311++G(d,p) computational level with D3 correction. This study focuses on the zwitter-ionic type 32CA reaction, highlighting its polar character with the electronic flux from the azomethine ylide to the alkene. The reaction proceeds with complete endo-stereoselectivity, and the activation parameters show minimal variations in different solvents, consistent with experimental observations. The activation energy is associated with the depopulation of the N2–C1 and C4–C5 bonding regions, formation of non-bonding electron density at N2 nitrogen and creation of pseudoradical centers at C3, C4 and C5. These findings suggest that the formation of new covalent bonds does not occur at the transition states, in line with the presence of non-covalent interactions at the interatomic bonding regions, as revealed by the topological analysis of the Quantum Theory of Atoms-in-Molecules.

利用分子电子密度理论,在B3LYP/6-311++G(d,p)计算水平上研究了环亚甲亚胺(N-phenacylquinolinium bromide)与n -芳基马来酰亚胺之间的[3+2]环加成反应(32CA),生成吡咯[1,2-a]喹诺酮。本研究以两性离子型32CA反应为研究对象,着重分析了其极性特征,以及从亚甲酰基到烯烃的电子通量。反应以完全的立体选择性进行,活化参数在不同溶剂中变化最小,与实验观察一致。活化能与N2 - c1和C4 - C5成键区域的失居、N2氮上非成键电子密度的形成以及C3、C4和C5上伪自由基中心的形成有关。这些发现表明,新的共价键的形成不会发生在过渡态,这与原子间键区存在非共价相互作用是一致的,正如原子分子量子理论的拓扑分析所揭示的那样。
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引用次数: 0
The B3S monolayer as a high-capacity anode material for sodium-ion batteries: First-principles density functional theory approach 作为高容量钠离子电池负极材料的B3S单层材料:第一性原理密度泛函理论方法
4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-11-14 DOI: 10.1007/s00214-023-03070-0
Mohamed J. Saadh, Manal A. Abbood, Abdelmajeed Adam Lagum, Anjan Kumar, Salema K. Hadrawi, A. H. Shather, Ali Abdulhasan Kadhim, Ali Majdi
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引用次数: 0
Intermolecular charge-transfer complex between solute and ionic liquid: experimental and theoretical studies 溶质和离子液体之间的分子间电荷转移复合物:实验和理论研究
4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-11-13 DOI: 10.1007/s00214-023-03073-x
Sumit Kumar, Sumit Kumar Panja
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引用次数: 0
The lowest singlet states of hexatriene revisited 六三烯的最低单重态
4区 化学 Q4 CHEMISTRY, PHYSICAL Pub Date : 2023-11-13 DOI: 10.1007/s00214-023-03064-y
Riccardo Guareschi, Celestino Angeli
Abstract The two lowest excited singlet states of trans -hexatriene and cis -hexatriene are studied by multireference perturbation theory approaches (NEVPT2 and CASPT2) in their quasi-degenerate version (QD-NEVPT2 and MS-CASPT2). For these states, we report spectroscopic properties such as the vertical and adiabatic excitation energies, some features of the topology of the potential energy surfaces (PES), and the emission energies. The theoretical vertical excitation energies for the $${2{hspace{0.05cm}}{^1textrm{A}_g^-}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>2</mml:mn> <mml:mspace /> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>1</mml:mn> </mml:msup> <mml:msubsup> <mml:mtext>A</mml:mtext> <mml:mi>g</mml:mi> <mml:mo>-</mml:mo> </mml:msubsup> </mml:mrow> </mml:mrow> </mml:math> and $${1{hspace{0.05cm}}{^1textrm{B}_u^+}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1</mml:mn> <mml:mspace /> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>1</mml:mn> </mml:msup> <mml:msubsup> <mml:mtext>B</mml:mtext> <mml:mi>u</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> </mml:mrow> </mml:mrow> </mml:math> states of trans -hexatriene are found to be almost degenerate, with a value, $$simeq$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>≃</mml:mo> </mml:math> 5.5–5.6 eV, higher than that normally accepted in the literature, 5.2 eV and 5.1 eV, respectively. The $${2{hspace{0.05cm}}{^1textrm{A}_1}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>2</mml:mn> <mml:mspace /> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>1</mml:mn> </mml:msup> <mml:msub> <mml:mtext>A</mml:mtext> <mml:mn>1</mml:mn> </mml:msub> </mml:mrow> </mml:mrow> </mml:math> and $${1{hspace{0.05cm}}{^1textrm{B}_2}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1</mml:mn> <mml:mspace /> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>1</mml:mn> </mml:msup> <mml:msub> <mml:mtext>B</mml:mtext> <mml:mn>2</mml:mn> </mml:msub> </mml:mrow> </mml:mrow> </mml:math> states of cis -hexatriene are also almost degenerate and are estimated to be at $$simeq$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>≃</mml:mo> </mml:math> 5.4–5.5 and $$simeq$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>≃</mml:mo> </mml:math> 5.5 eV, respectively, again higher than the accepted values. The adiabatic excitation energies to the $${2{hspace{0.05cm}}{^1textrm{A}_g^-}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>2</mml:mn> <mml:mspace /> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>1</mml:mn> </mml:msup> <mml:msubsup> <mml:mtext>A</mml:mtext> <mml:mi>g</mml:mi> <mml:mo>-</mml:mo> </mml:msubsup> </mml:mrow> </mml:mrow> </mml:math> and $${2{hspace{0.05cm}}{^1textrm{A}_1}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>2</mml:mn> <mml:mspace /> <mml:mrow> <mml:msup> <mml:mrow /> <mml:mn>1</mml:
摘要采用多参考微扰理论方法研究了反式-六三烯和顺式-六三烯的两个最低激发单重态(NEVPT2和CASPT2)的准简并态(QD-NEVPT2和MS-CASPT2)。对于这些状态,我们报告了光谱性质,如垂直和绝热激发能,势能面(PES)拓扑结构的一些特征,以及发射能。反式六三烯的$${2{hspace{0.05cm}}{^1textrm{A}_g^-}}$$ 21 A g -态和$${1{hspace{0.05cm}}{^1textrm{B}_u^+}}$$ 11 B u +态的理论垂直激发能几乎为简并态,其值$$simeq$$为5.5-5.6 eV,高于文献中普遍接受的5.2 eV和5.1 eV。顺式六三烯的$${2{hspace{0.05cm}}{^1textrm{A}_1}}$$ 211 a1和$${1{hspace{0.05cm}}{^1textrm{B}_2}}$$ 211 b2态也几乎为简并态,估计分别在$$simeq$$≃5.4-5.5 eV和$$simeq$$≃5.5 eV处,也高于可接受值。在实验中(特别是顺式异构体)可以观察到$${2{hspace{0.05cm}}{^1textrm{A}_g^-}}$$ 21a g -和$${2{hspace{0.05cm}}{^1textrm{A}_1}}$$ 21a 1态的绝热激发能,我们的结果与实验值非常吻合。相反,这些状态的垂直激发能在实验光谱中不能直接观测到,“实验”值是通过有根据的猜测获得的。我们表明,这些猜测背后的假设并不完全有根据。
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引用次数: 0
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引用次数: 0
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{"title":"Exploring unimolecular reactions in disilanol and ethanol: Insights and challenges","authors":"Saulo A. Vázquez, Emilio Martínez-Núñez, Thomas J. Preston","doi":"10.1007/s00214-023-03062-0","DOIUrl":"https://doi.org/10.1007/s00214-023-03062-0","url":null,"abstract":"","PeriodicalId":23045,"journal":{"name":"Theoretical Chemistry Accounts","volume":" 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135242585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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{"title":"Single alkali metal-doped hexalithioborazine complexes with exceptionally high value of polarizability and first hyperpolarizability: a DFT-based computational study","authors":"Usha Mandal, Shashanka Shekhar Samanta, Subhadip Giri, Ajay Misra","doi":"10.1007/s00214-023-03066-w","DOIUrl":"https://doi.org/10.1007/s00214-023-03066-w","url":null,"abstract":"","PeriodicalId":23045,"journal":{"name":"Theoretical Chemistry Accounts","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135342570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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