NdCl3-FeCl3-石墨层间化合物的XPS研究

通过熔盐交换法合成了ＮｄＣｌ３－ＦｅＣｌ３－ＧＩＣ,采用Ｘ射线电子能谱（ＸＰＳ）分析插入剂在石墨层间的存在形式,并测定了试样中Ｎｄ,Ｆｅ,Ｃｌ和Ｃ的相对含量。ＮｄＣｌ３－ＦｅＣｌ３－ＧＩＣ中Ｆｅ２ｐ的结合能为７１１．２０－７１０．３ｅＶ,Ｎｄ３ｄ的结合能为９８３．２０－９８３．０８ｅＶ,并发现Ｆｅ在石墨层ｅ＾３＋,Ｆｅ＾２＋形式存在。     

含氮配体过渡金属络正离子与[Ni（cdc）2]^2—加合物的电子光谱和电导？…

研究了１０个含氮配体的过渡金属络正离子与「Ｎｉ（ｃｄｃ）２」＾２－加合物在溶液２和固体状态下的电子光谱和溶液电导率,发现电导率（Ω＾－１·ｃｍ＾２·ｍｏｌ＾－１）和加合物在ＨＣｌ介质中π－π跃迁带Ｖｍａｘ（ｃｍ＾－１）值呈一致变化关系。对吸收峰作出了归属,指定了负离子的ＭＬＣＴ带,并指出极性溶剂使ＭＬＣＴ带蓝移,ππ跃迁带红移。     

GdxY1—XP5O14：Ce,Tb的发光和能量传递：Ⅰ.制备,结构和光谱性质

研究了稀土五磷酸盐Ｇｄｘ１－ＸＰ５Ｏ１４：Ｃｅ，Ｔｂ体系的制备，结构和光谱性质。当ｘ＞０．７时，该材料属单斜晶系Ｉ，Ｐ２１／ｃ结构，当≤０．７时，属单斜晶系Ⅱ，Ｃ２／ｃ结构。研究了ＧｄＰ５Ｏ１４：Ｃｅ，Ｔｂ６ ＹＰ５Ｏ１４：Ｃｅ，Ｔｂ的荧光光谱，确定了通过基质Ｇｄ离子中介的Ｃｅ＾３＋→Ｇｄ＾３＋→Ｔｂ＾３＋能量传递的现象。     

配合物CoF^n—6（n=2,3,4）光谱的理论研究

本文建议了一种将多重散射Ｘａ方法与不可约张量法相结合过解过渡金属配合物价电子体系多电子Ｓｃｈｒｏｄｉｎｇｅｒ方程的新方法，并将其应用到系列分子ＣｏＦ＾ｎ－６（ｎ＝２，３，４）ｄ－ｄ跃迁能的计算，计算结果与实验结果的均方根偏差仅为２ｋｃｍ＾－１，同时分析了Ｘａ方法中重叠修正项对单电子结构及光谱计算结果的影响。     

蝶状铁硒簇合物双（μ—p—甲苯硒基）六羰基二铁双膦取代…

测得并解析了２个蝶状铁硒取代衍生物（μ－ｐ－ＭｅＣ６Ｈ４Ｓｅ）２Ｆｅ２（ＣＯ）２（Ｐｈ２ＰＣＨ２ＣＨ２ＰＰｈ２）（Ａ）和（μ－ｐ－ＭｅＣ６Ｈ４Ｓｅ）２Ｆｅ２（ＣＯ）４（ｃｉｓ－Ｐｈ２ＰＣＨ＝ＣＨＰＰＨ２）（Ｂ）的＾１Ｈ－＾１ＨＣＯＳＹ谱和＾１Ｈ－＾１５ＣＣＯＳＹ谱以及Ａ的＾１Ｈ－＾１ＨＮＯＥＳＲ谱，从而进一不确证了它们的结构。     

类水滑石[CdxMg6—xAl2（OH）16]^2＋[S.2H2O]^2—l的合成与表征

用中温水热法合成了类水滑石〔ＣｄｘＭｇ６－ｘＡｌ２（ＯＨ）１６〕＾２＋〔Ｓ．２Ｈ２Ｏ〕＾２－，探讨了ＰＨ值、投入Ｃｄ＾２＋离子的量以及硫化时间等条件对合成的影响，并用ＸＲＤ、ＦＴ－ＩＲ、ＤＴＡ－ＴＧ等手段进行了表征，找出了合成层间嵌入Ｓ＾２－离子的含Ｃｄ类水滑石的最佳条件。     

KZnF3中Ce^3＋→Eu^2＋的能量传递

研究了ＫＺｎＦ３中Ｃｅ＾２＋和Ｅｕ＾２＋的光谱特性,在共掺Ｃｅ＾３＋和Ｅｕ＾２＋的体系中,观察到了Ｃｅ＾３＋对Ｅｕ＾２＋的能量传递过程,计算了能量传递的量子效率,探讨了能量传递机理,研究发现,Ｃｅ＾３＋的存在有利于Ｅｕ＾２＋的ｆ－ｆ跃迁线状发射。     

碘量法测定冶金物料中铁

系统地研究了Ｆｅ＾３＋与Ｉ＾－定量反应的条件，共存离子的干扰及消除方法，在ＨＣｌ和ＫＩ存在下，Ｆｅ＾３＋与Ｉ＾－定量反应，Ｃｕ＾２＋，ＡｓＯ４＾３－，ＶＯ２＾＋，等定量干扰，使用ＮａＦ或Ｈ３ＰＯ４制备参比液可抵消干扰。可不经分离直接测定大部分冶金物料中的高含量铁。     

流动注射光度法测定铁的研究：Ⅱ.Fe（Ⅲ）—CAS—SAS胶束体系

用自行组装的ＦＩＡ装置，对Ｆｅ（Ⅲ）－ＣＡＳ－表面活性剂体系进行了系统研究。着重考察了表面活性剂的影响，选择了Ｆｅ（Ⅲ）－ＣＡＳ－ＴｒｉｔｏｎＸ－１００－ＨＤＭＡＡ混合胶束体系，拟定了Ｆｅ（Ⅲ）的ＦＩＡ光度法，用于总铁量的测定，方法的线性范围，检测限及采样速度分别为０～０．６ｍｇ．Ｌ＾－１，０．００２ｍｇ．Ｌ＾－１和９０样次ｈ＾－１，该法用于天然水或某些工业用水总铁量的测定，结果满意。     

[Mx(FeCO2)yLz]型配合物的合成、表征及CV性质研究(M＝Cu(II), Co(II), Cd(II), Pb(II);L=THF, Cl-)

［Ｍｘ（ＦｃＣＯ２）ｙＬｘ］型配合物可在ＴＨＦ中通Ｎ２条件下由ＦｃＣＯ２Ｈ和ＭＸ．ｎＨ２Ｏ（Ｘ＝Ｃｌ＾－和Ａｃ＾－）经长时间反应制得。ＩＲ和＾１ＨＮＭＲ谱表明Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）属螯环配合物，Ｃｄ（Ⅱ）属四面体型配合物，Ｐｂ（Ⅱ）属线型化合物。     

Low energy electron energy-loss spectroscopy of CF3X (X=Cl,Br)

We report threshold electron energy-loss spectra for the fluorohalomethanes CF3X (X=Cl,Br). Measurements were made at incident electron energies of 30 and 100 eV in energy-loss range of 4-14 eV, and at scattering angles of 4 degrees and 15 degrees. Several new electronic transitions are observed which are ascribable to excitation of low-lying states as well as are intrinsically overlapped in the molecules themselves. Assignments of these electronic transitions are suggested. These assignments are based on present spectroscopic and cross-section measurements, high-energy scattering spectra, and ab initio molecular orbital calculations. The calculated potential curves along the C-X bond show repulsive nature, suggesting that these transitions may lead to dissociation of the C-X bond. The present results are also compared with the previous ones for CF3H, CF4, and CF3I.     

C28X4（X=H,Cl）,CX4（X=H,Cl）的结构和电子光谱的理论研究

用ＩＮＤＯ法对Ｃ２８Ｘ４（Ｘ＝Ｈ，Ｃｌ）和ＣＸ４（Ｘ＝Ｈ，Ｃｌ）进行几何构型优化，得到Ｔｄ对称性的构型Ｃ２８Ｘ４有４种键、４种不等同原子，基态为稳定的闭壳层分子，以此构型为基础计算了上述分子的电子光谱，并预测Ｃ２８Ｘ４的电子光谱。     

Multimode Jahn-Teller and pseudo-Jahn-Teller interactions in the cyclopropane radical cation: complex vibronic spectra and nonradiative decay dynamics

The complex vibronic spectra and the nonradiative decay dynamics of the cyclopropane radical cation (CP+) are simulated theoretically with the aid of a time-dependent wave packet propagation approach using the multireference time-dependent Hartree scheme. The theoretical results are compared with the experimental photoelectron spectrum of cyclopropane. The ground and first excited electronic states of CP+ are of X2E' and A2E' type, respectively. Each of these degenerate electronic states undergoes Jahn-Teller (JT) splitting when the radical cation is distorted along the degenerate vibrational modes of e' symmetry. The JT split components of these two electronic states can also undergo pseudo-Jahn-Teller (PJT)-type crossings via the vibrational modes of e', a1' and a2' symmetries. These lead to the possibility of multiple multidimensional conical intersections and highly nonadiabatic nuclear motions in these coupled manifolds of electronic states. In a previous publication [J. Phys. Chem. A 2004, 108, 2256], we investigated the JT interactions alone in the X2E' ground electronic manifold of CP+. In the present work, the JT interactions in the A2E' electronic manifold are treated, and our previous work is extended by considering the coupling between the X2E' and A2E' electronic states of CP+. The nuclear dynamics in this coupled manifold of two JT split doubly degenerate electronic states is simulated by considering fourteen active and most relevant vibrational degrees of freedom. The vibronic level spectra and the ultrafast nonradiative decay of the excited cationic states are examined and are related to the highly complex entanglement of electronic and nuclear degrees of freedom in this prototypical molecular system.     

Density functional analysis of geometries and electronic structures of gold-phosphine clusters. The case of Au4(PR3)42+ and A(u4μ2-I)2(PR3)4

Geometries, ligand binding energies, electronic structure, and excitation spectra are determined for Au(4)(PR(3))(4)(2+) and Au(4)(μ(2)-I)(2)(PR(3))(4) clusters (R = PH(3), PMe(3), and PPh(3)). Density functionals including SVWN5, Xα, OPBE, LC-ωPBE, TPSS, PBE0, CAM-B3LYP, and SAOP are employed with basis sets ranging from LANL2DZ to SDD to TZVP. Metal--metal and metal--ligand bond distances are calculated and compared with experiment. The effect of changing the phosphine ligands is assessed for geometries and excitation spectra. Standard DFT and hybrid ONIOM calculations are employed for geometry optimizations with PPh(3) groups. The electronic structure of the gold--phosphine clusters examined in this work is analyzed in terms of cluster ("superatom") orbitals and d-band orbitals. Transitions out of the d band are significant in the excitation spectra. The use of different basis sets and DFT functionals leads to noticeable variations in the relative intensities of strong transitions, although the overall spectral profile remains qualitatively unchanged. The replacement of PMe(3) with PPh(3) changes the nature of the electronic transitions in the cluster due to low-lying π*-orbitals. To reproduce the experimental geometries of clusters with PPh(3) ligands, computationally less expensive PH(3) or PMe(3) ligands are sufficient for geometry optimizations. However, to predict cluster excitation spectra, the full PPh(3) ligand must be considered.     

双核钯配合物Pd2L2和Pd2L2X2 (L＝Me2PCH2PMe2; X＝F, Cl, Br, I, H)的量子化学理论研究

采用ab initio HF, MP2方法和密度泛函理论方法, 对Pd(0), Pd(I)双核配合物Pd2L2和Pd2L2X2 (L＝Me2PCH2PMe2; X＝F, Cl, Br, I, H)的几何结构和电子结构进行了研究. 研究表明Pd2L2中Pd原子间的相互作用主要来自电子相关效应, Pd2L2X2中Pd原子间的相互作用则主要来自d轨道的成键作用. MP2方法和局域泛函Xα方法能对两类配合物的几何结构给予准确的描述. 在Pd2L2中, Pd原子的4d电子组成一一对应的成键、反键轨道, 轨道作用相互抵消使Pd原子间仅存在微弱的相互作用. X原子与Pd2L2的作用使Pd—Pd反键轨道电子占据数减少, 成键作用加强. 两类配合物的 Pd—Pd键长与NAO键级之间存在很好的线性关系. 还对Pd2L2和Pd2L2X2的低占据电子激发态进行了含时密度泛函理论计算, 分析不同配合物的电子跃迁特征, 并就卤素配体对Pd2L2X2光谱性质的影响进行了讨论.     

非经验参量化的相对论EHT研究: 含卤双原子分子的电子结构

本文用非经验参量化的相对论推广的Huckel方法(REHT), 系统研究了X2XX',HX和InX(X,X'=F,Cl, Br, I)等17 个分子的电子结构, 按周期序列变化的成键趋向和轨道能级的移动等, 给予了在非相对论图像中难以说明的一些实验现象以合理描述。     

Jahn-Teller and related effects in the silver trimer. II: vibrational analysis of the A 2E"-X 2E' electronic transition

The laser-excited, jet-cooled A 2E"-X 2E' electronic spectrum of the silver trimer yields detailed information about its A- and X-state vibronic structure. Following extensive parameter fitting, the absorption and emission spectra are simulated and the bands are assigned. The Jahn-Teller analysis includes both linear and quadratic coupling terms, considered simultaneously with spin-orbit coupling. The spin-orbit splitting is shown to be largely quenched in both the A and X electronic states. The Jahn-Teller analysis of the A and X vibronic structures reveals the distortion of their corresponding potential energy surfaces.     

Synthesis and magneto-spectral investigations of some six and nine coordinated complexes of lanthanides(III) derived from 4[N-(2′-hydroxy-1′-naphthalidene) amino]antipyrinethiosemicarbazone

The present work describes the synthesis and characterization of some six and nine coordinated complexes of trivalent lanthanide(III) with 4[N-(2′-hydroxy-1′-naphthalidene)amino]antipyrinethiosemicarbazone (HNAAPTS). All the complexes have the general composition LnX₃.n(HNAAPTS) (X = NO₃ ^?, n = 1; X = NCS^? or ClO₄ ^?, n = 2). The complexes were characterized through elemental analyses, molar mass, conductivity measurements, magnetic susceptibilities, and infrared and electronic spectra. Infrared spectra revealed that HNAAPTS acts as a neutral tridentate (N,N,S) donor. The coordination number in these complexes is either six or nine depending on the nature of the anionic ligand.     

Slow photoelectron velocity-map imaging spectroscopy of the n-methylvinoxide anion

High resolution photoelectron spectra of the n-methylvinoxide anion and its deuterated isotopologue are obtained by slow electron velocity-map imaging. Transitions between the X?(1)A' anion ground electronic state and the radical X?(2)A" and A?(2)A' states are observed. The major features in the spectra are attributed to transitions involving the lower energy cis conformers of the anion and neutral, while the higher energy trans conformers contribute only a single small peak. Franck-Condon simulations of the X?(2)A" ← X?(1)A' and A?(2)A' ← X?(1)A' transitions are performed to assign vibrational structure in the spectrum and to aid in identifying peaks in the cis-n-methylvinoxy X? (2)A" band that occur only through vibronic coupling. The experimental electron affinity and A? state term energy are found to be EA = 1.6106 ± 0.0008 eV and T(0) = 1.167 ± 0.002 eV for cis-n-methylvinoxy.     

Metal Complexes of Thiophosphinic and Selenophosphinic Acids

The anions of thiophosphinic and selenophosphinic acids R₂P(X) YH (X = S, Se; Y = O, S, Se) can act as bidentate ligands. They combine with many metals to form complexes containing a four-membered chelate ring, or to give coordination polymers in which they form ligand bridges. The preparation, properties, and reactions of these compounds, as well as the dielectric properties and analytical use of dithiophosphinato complexes, which are also of industrial interest, are described. Some thiophosphinato and selenophosphinato complexes exhibit concentration-dependent association via ligand bridges. Evidence of the chelate nature of the ligands R₂P(X)Y? was obtained from IR spectroscopic studies. The ligand field parameters of the anion (C₂H₅)₂P(S)S? were deduced from the electronic spectra of octahedral diethyldithiophosphinato complexes, and the position of the ligand in the spectrochemical and nephelauxetic series were determined from these parameters.