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Theoretical study on Xe⋯N non-covalent interactions: Three hybridization N with XeO3 and XeOF2 Xe·N非共价相互作用的理论研究:XeO3和XeOF2的三杂交N
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-04-01 DOI: 10.1063/1674-0068/cjcp2110182
Sujun Ji, Zhiling Ding, Hang Yin, Daoyuan Zheng, Jin-feng Zhao
The interactions of complexes of XeOF2 and XeO3 with a series of different hybridization N-containing donors are studied by means of DFT and MP2 calculations. The aerogen bonding interaction energies range from 6.5 kcal/mol to 19.9 kcal/mol between XeO3 or XeOF2 and typical N-containing donors. The sequence of interaction for N-containing hybridization is sp3>sp2>sp, and XeO3 is higher than XeOF2. For some donors of sp2 and sp3 hybridization, the steric effect plays a minor role in the interaction with the evidence of reduced density gradient plots. The dominant stable part is the electrostatic interaction. In complex of XeO3, the weight of polarization is larger than dispersion, while the situation is opposite for XeOF2 complexes. Except for the sum of the maximum value of molecular electrostatic potential on Xe atom and minimum value of molecular electrostatic potential on N atom, the otherfive interaction parameters including the potential energy density at bond critical point, the equilibrium distances, interaction energies with the basis set superposition error correction, localized molecular orbital energy decomposition analysis interaction energies, and the electron charge density, show great linear correlation coefficients with each other.
通过DFT和MP2计算,研究了XeOF2和XeO3配合物与一系列不同的杂化n给体的相互作用。XeO3或XeOF2与典型含氮供体之间的气相键能在6.5 ~ 19.9 kcal/mol之间。含n杂化的相互作用顺序为sp3>sp2>sp,且XeO3高于XeOF2。对于sp2和sp3杂交的一些给体,空间位阻效应在相互作用中起次要作用,并有证据表明密度梯度图降低。主要的稳定部分是静电相互作用。在XeO3配合物中,极化的权重大于色散,而在XeOF2配合物中则相反。除Xe原子上的分子静电势最大值和N原子上的分子静电势最小值之和外,其他5个相互作用参数包括键临界点势能密度、平衡距离、基集叠加误差修正的相互作用能、局域分子轨道能量分解分析相互作用能、电子电荷密度。相互之间表现出很强的线性相关系数。
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引用次数: 5
15 N/14N isotopic exchange in the dissociative adsorption of N2 on tantalum nitride cluster anions Ta3N3− 氮化钽簇阴离子Ta3N3−上15n /14N的同位素交换
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-02-01 DOI: 10.1063/1674-0068/cjcp2112286
Zi-Yu Li, Li-Hui Mou, G. Jiang, Qing-Yu Liu, Sheng‐Gui He
Adsorption and activation of dinitrogen (N2) is an indispensable process in nitrogen fixation. Metal nitride species continue to attract attention as a promising catalyst for ammonia synthesis. However, the detailed mechanisms at a molecular level between reactive nitride species and N2 remain unclear at elevated temperature, which is important to understand the temperature effect and narrow the gap between the gas phase system and condensed phase system. Herein, the 14N/15N isotopic exchange in the reaction between tantalum nitride cluster anions Ta314N3− and 15N2 leading to the regeneration of 14N2/14N15N was observed at elevated temperature (393−593 K) using mass spectrometry. With the aid of theoretical calculations, the exchange mechanism and the effect of temperature to promote the dissociation of N2 on Ta3N3− were elucidated. A comparison experiment for Ta314N4−/15N2 couple indicated that only desorption of 15N2 from Ta314N415N2− took place at elevated temperature. The different exchange behavior can be well understood by the fact that nitrogen vacancy is a requisite for the dinitrogen activation over metal nitride species. This study may shed light on understanding the role of nitrogen vacancy in nitride species for ammonia synthesis and provide clues in designing effective catalysts for nitrogen fixation.
二氮的吸附和活化是固氮过程中不可缺少的一个环节。金属氮化物作为一种很有前途的氨合成催化剂不断受到人们的关注。然而,在高温下,活性氮化物与N2在分子水平上的详细机制尚不清楚,这对于理解温度效应和缩小气相体系与凝聚相体系之间的差距具有重要意义。在高温(393 ~ 593 K)条件下,利用质谱法观察了氮化钽簇阴离子Ta314N3 -和15N2之间的14N/15N同位素交换导致14N2/14N15N的再生。通过理论计算,阐明了温度对Ta3N3−上N2解离的影响及交换机理。Ta314N4−/15N2对的对比实验表明,在高温下Ta314N415N2−只发生15N2的解吸。氮空位是金属氮化物上二氮活化的必要条件,这一事实可以很好地理解不同的交换行为。该研究有助于理解氮化物中氮空位在氨合成中的作用,并为设计有效的固氮催化剂提供线索。
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引用次数: 2
High resolution laser excitation spectra and Franck-Condon factors of A2Π−X2Σ+ electronic transition of MgF MgF的高分辨激光激发光谱和A2π−X2∑+电子跃迁的Franck-Condon因子
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-02-01 DOI: 10.1063/1674-0068/cjcp2109151
J. Gu, Zengjun Xiao, Chunting Yu, Qiang Zhang, Yang Chen, Dongfeng Zhao
Magnesium monofluoride (MgF) is proposed as an ideal candidate radical for direct laser cooling. Here, the rotationally resolved laser spectra of MgF for the A2Π− X2Σ+ electronic transition system were recorded by using laser induced fluorescence technique. The MgF radicals were produced by discharging SF6/Ar gas mixtures between the tips of two magnesium needles in a supersonic jet expansion. We recorded a total of 19 vibrational bands belonging to three sequences of Δ v=0, ±1 in the region of 348-370 nm. Accurate spectroscopic constants for both X2Σ+ and A2Π states are determined from rotational analysis of the experimental spectra. Spectroscopic parameters, including the Franck-Condon factors (FCFs), are determined from the experimental results and the Rydberg-Klein-Rees (RKR) calculations. Significant discrepancies between the experimentally measured and RKR-calculated FCFs are found, indicating that the FCFs are nearly independent of the spin-orbit coupling in the A2Π state. Potential energy curves (PECs) and FCFs determined here provide necessary data for the theoretical simulation of the laser-cooling scheme of MgF.
单氟化镁(MgF)是一种理想的激光直接冷却自由基。本文利用激光诱导荧光技术记录了A2Π−X2Σ+电子跃迁体系中MgF的旋转分辨激光光谱。在超声速射流膨胀过程中,在两根镁针针尖间释放SF6/Ar混合气体,产生MgF自由基。在348 ~ 370 nm范围内共记录了19个振动带,分别属于Δ v=0,±1三个序列。通过对实验光谱的旋转分析,确定了X2Σ+和A2Π态的精确光谱常数。光谱参数包括frank - condon因子(ffs),由实验结果和Rydberg-Klein-Rees (RKR)计算确定。实验测量的ffs与rkr计算的ffs之间存在显著差异,表明在A2Π状态下,ffs几乎与自旋-轨道耦合无关。本文确定的势能曲线(PECs)和ffs为MgF激光冷却方案的理论模拟提供了必要的数据。
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引用次数: 5
Probing effect of solvation on photoexcited quadrupolar donor-acceptor-donor molecule via ultrafast Raman spectroscopy 用超快拉曼光谱探测溶剂化对光激发四极供体-受体-供体分子的影响
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-02-01 DOI: 10.1063/1674-0068/cjcp2111223
Wei Zhang, J. Kong, Wenqi Xu, Xinmiao Niu, D. Song, Weimin Liu, A. Xia
The symmetric and quadrupolar donor-acceptor-donor (D-A-D) molecules usually exhibit excited-state charge redistribution process from delocalized intramolecular charge transfer (ICT) state to localized ICT state. Direct observation of such charge redistribution process in real-time has been intensively studied via various ultrafast time-resolved spectroscopies. Femtosecond stimulated Raman spectroscopy (FSRS) is one of the powerful methods which can be used to determine the excited state dynamics by tracking vibrational mode evolution of the specific chemical bonds within molecules. Herein, a molecule, 4,4′-(buta-1,3-diyne-1,4-diyl)bis( N, N-bis(4-methoxyphenyl)aniline), that consists of two central adjacent alkyne (-C≡C-) groups as electron-acceptors and two separated, symmetric N, N-bis(4-methoxyphenyl)aniline at both branches as electron-donors, is chosen to investigate the excited-state photophysical properties. It is shown that the solvation induced excited-state charge redistribution in polar solvents can be probed by using femtosecond stimulated Raman spectroscopy. The results provide a fundamental understanding of photoexcitation induced charge delocalization/localization properties of the symmetric quadrupolar molecules with adjacent vibrational markers located at central position.
对称和四极性给体-受体-给体(D-A-D)分子通常表现出从离域分子内电荷转移(ICT)态到定域ICT态的激发态电荷再分配过程。通过各种超快时间分辨光谱对这种电荷重分配过程的实时直接观察进行了深入研究。飞秒受激拉曼光谱(FSRS)是通过跟踪分子内特定化学键的振动模式演变来确定激发态动力学的有力方法之一。本文选择4,4 ' -(丁-1,3-二炔-1,4-二基)双(N, N-双(4-甲氧基苯基)苯胺)分子,由两个中心相邻的炔(-≡C-)基团作为电子受体和两个分离的对称的N, N-双(4-甲氧基苯胺)分支作为电子供体组成,研究激发态光物理性质。结果表明,用飞秒受激拉曼光谱可以探测溶剂化引起的极性溶剂中激发态电荷重分布。研究结果为研究中心位置有相邻振动标记的对称四极性分子的光激发诱导电荷离域/局域性提供了一个基本的认识。
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引用次数: 0
Solvent effects on excited-state relaxation dynamics of paddle-wheel BODIPY-Hexaoxatriphenylene conjugates: Insights from non-adiabatic dynamics simulations 溶剂对桨轮BODIPY-六氧杂三苯基偶联物激发态弛豫动力学的影响:非绝热动力学模拟的启示
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-02-01 DOI: 10.1063/1674-0068/cjcp2110214
Wen-Kai Chen, G. Cui, Xiangxuan Liu
Understanding the excited state dynamics of donor-acceptor (D-A) complexes is of fundamental importance both experimentally and theoretically. Herein, we have first explored the photoinduced dynamics of a recently synthesized paddle-wheel BODIPY-hexaoxatriphenylene (BODIPY is the abbreviation for BF2-chelated dipyrromethenes) conjugates D-A complexes with the combination of both electronic structure calculations and non-adiabatic dynamics simulations. On the basis of computational results, we concluded that the BODIPY-hexaoxatriphenylene (BH) conjugates will be promoted to the local excited (LE) states of the BODIPY fragments upon excitation, which is followed by the ultrafast exciton transfer from LE state to charge transfer (CT). Instead of the photoinduced electron transfer process proposed in previous experimental work, such a exciton transfer process is accompanied with the photoinduced hole transfer from BODIPY to hexaoxatriphenylene. Additionally, solvent effects are found to play an important role in the photoinduced dynamics. Specifically, the hole transfer dynamics is accelerated by the acetonitrile solvent, which can be ascribed to significant influences of the solvents on the charge transfer states, i.e. the energy gaps between LE and CT excitons are reduced greatly and the non-adiabatic couplings are increased in the meantime. Our present work not only provides valuable insights into the underlying photoinduced mechanism of BH, but also can be helpful for the future design of novel donor-acceptor conjugates with better optoelectronic performance.
了解供体-受体(D-A)配合物的激发态动力学在实验和理论上都具有重要意义。在此,我们首次结合电子结构计算和非绝热动力学模拟,探索了最近合成的桨轮BODIPY六氧杂三苯基(BODIPY是BF2螯合二吡咯甲烷的缩写)偶联物D-a配合物的光致动力学。基于计算结果,我们得出结论,BODIPY六氧杂三苯基(BH)偶联物在激发时将被促进到BODIPY片段的局部激发(LE)态,随后是从LE态到电荷转移(CT)的超快激子转移。与先前实验工作中提出的光诱导电子转移过程不同,这种激子转移过程伴随着从BODIPY到六氧杂三苯基的光诱导空穴转移。此外,发现溶剂效应在光诱导动力学中起着重要作用。具体而言,乙腈溶剂加速了空穴转移动力学,这可归因于溶剂对电荷转移态的显著影响,即LE和CT激子之间的能隙大大减小,同时非绝热耦合增加。我们目前的工作不仅为BH的潜在光诱导机制提供了有价值的见解,而且有助于未来设计具有更好光电性能的新型供体-受体偶联物。
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引用次数: 0
QM/MM study on enzymatic mechanism in sinigrin biosynthesis 缬氨酸生物合成酶机制的QM/MM研究
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-02-01 DOI: 10.1063/1674-0068/cjcp2111250
Yafang Guo, Yajun Liu
As the major and abundant type of glucosinolates (GL) in plants, sinigrin has potential functions in promoting health and insect defense. The final step in the biosynthesis of sinigrin core structure is highly representative in GL compounds, which corresponds to the process from 3-methylthiopropyl ds-GL to 3-methylthiopropyl GL catalyzed by sulfotransferase (SOT). However, due to the lack of the crystallographic structure of SOT complexed with the 3-methylthiopropyl GL, little is known about this sulfonation process. Fortunately, the crystal structure of SOT 18 from Arabidopsis thaliana (AtSOT18) containing the substance (sinigrin) similar to 3-methylthiopropyl GL has been determined. To understand the enzymatic mechanism, we employed molecular dynamics (MD) simulation and quantum mechanics combined with molecular mechanics (QM/MM) methods to study the conversion from ds-sinigrin to sinigrin catalyzed by AtSOT18. The calculated results demonstrate that the reaction occurs through a concerted dissociative mechanism. Moreover, Lys93, Thr96, Thr97, Tyr130, His155, and two enzyme peptide chains (Pro92-Lys93 and Gln95-Thr96-Thr97) play a role in positioning the substrates and promoting the catalytic reaction by stabilizing the transition state geometry. Particularly, His155 acts as a catalytic base while Lys93 acts as a catalytic acid in the reaction process. The presently proposed concerted dissociative mechanism explains the role of AtSOT18 in sinigrin biosynthesis, and could be instructive for the study of GL biosynthesis catalyzed by other SOTs.
紫荆素是植物中硫代葡萄糖苷(glucosinolates, GL)的主要和丰富类型,具有潜在的促进健康和抗虫功能。紫红素核心结构生物合成的最后一步在GL化合物中极具代表性,对应于硫转移酶(SOT)催化下从3-甲基硫丙基ds-GL到3-甲基硫丙基GL的过程。然而,由于缺乏SOT与3-甲基硫丙基GL络合的晶体结构,对这一磺化过程知之甚少。幸运的是,来自拟南芥(Arabidopsis thaliana)的sot18 (AtSOT18)含有类似于3-甲基硫丙基GL的物质(sinigrin)的晶体结构已经确定。为了了解其酶促机制,我们采用分子动力学(MD)模拟和量子力学结合分子力学(QM/MM)方法研究了AtSOT18催化ds- sinigin转化为sinigin的过程。计算结果表明,该反应是通过协同解离机制发生的。此外,Lys93、Thr96、Thr97、Tyr130、His155和两条酶肽链(Pro92-Lys93和Gln95-Thr96-Thr97)通过稳定过渡态几何结构来定位底物并促进催化反应。特别是在反应过程中,His155作为催化碱,Lys93作为催化酸。目前提出的一致解离机制解释了AtSOT18在紫红素生物合成中的作用,对其他SOTs催化GL生物合成的研究具有指导意义。
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引用次数: 0
Basis sets dependency in constructing spectroscopy-accuracy Ab Initio global electric dipole moment functions 在构造光谱精度从头算全局电偶极矩函数中的基集依赖性
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-02-01 DOI: 10.1063/1674-0068/cjcp2111244
Yu Zhai, Hui Li
Recently, more attention have been paid on the construction of dipole moment functions (DMF) using theoretical methods. However, the computational methods to construct DMFs are not validated as much as those for potential energy surfaces do. In this letter, using Ar ⋯ He as an example, we tested how spectroscopy-accuracy DMFs can be constructed using ab initio methods. We especially focused on the basis set dependency in this scenario, i.e., the convergence of DMF with the sizes of basis sets, basis set superposition error, and mid-bond functions. We also tested the explicitly correlated method, which converges with smaller basis sets than the conventional methods do. This work can serve as a pictorial sample of all these computational technologies behaving in the context of constructing DMFs.
近年来,利用理论方法构造偶极矩函数越来越受到重视。然而,构建DMF的计算方法没有势能表面的计算方法那么有效。在这封信中,我们以Ar…He为例,测试了如何使用从头算方法构建光谱精度的DMF。我们特别关注这种情况下的基集依赖性,即DMF与基集大小、基集叠加误差和中键函数的收敛性。我们还测试了显相关方法,该方法比传统方法收敛于更小的基集。这项工作可以作为所有这些计算技术在构建DMF的背景下表现的图形样本。
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引用次数: 0
The low-lying isomers of (TiO2)n (n=2-8) clusters (TiO2)n (n=2-8)簇的低洼异构体
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-01-01 DOI: 10.1063/1674-0068/cjcp2111245
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引用次数: 1
Non-adiabatic Couplings Induced Complex-forming Mechanism in the H+MgH+→Mg++H2 Reaction H+MgH+→Mg++H2反应非绝热耦合诱导络合物形成机理
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-01-01 DOI: 10.1063/1674-0068/cjcp2111237
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引用次数: 1
Ab initio Nonadiabatic Dynamics of Semiconductor Nanomaterials via Surface Hopping Method 基于表面跳变法的半导体纳米材料从头计算非绝热动力学
IF 1 4区 化学 Q3 Chemistry Pub Date : 2022-01-01 DOI: 10.1063/1674-0068/cjcp2111247
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引用次数: 0
期刊
Chinese Journal of Chemical Physics
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