含取代基苯基羧酸与柔性含氮配体构筑的三个过渡配位化合物的合成、晶体结构与物理性质

利用3,5-二硝基苯甲酸（3,5-DNBH）,1,2-双咪唑亚甲苯（1,2-bimb）与3种过渡金属盐通过水热反应成功地构筑3个过渡金属配位化合物,即[M（3,5-DNB）₂（1,2-bimb）]（M=Co（Ⅱ）（1）,Cd（Ⅱ）（3））和[Zn（3,5-DNB）₂（1,2-bimb）]_n（3）。通过红外光谱、元素分析、单晶和粉末X射线衍射表征了这三个化合物。化合物1和3是同构的,含有一个双核单元[M₂（COO）₂],该双核单元由金属离子、3,5-二硝基苯甲酸根以及1,2-bimb分子构成。双核单元再通过O…π弱相互作用形成超分子结构,该弱相互作用是通过3,5-二硝基苯甲酸根上的硝基氧原子与1,2-bimb上的苯环所形成。化合物2是一维链结构,链与链之间再通过3,5-二硝基苯甲酸根和1,2-双咪唑亚甲苯配体上苯环之间的π…π相互作用,形成了一个超分子结构。室温条件下研究了化合物2和3分散在甲醇中的荧光性质。热重测试结果显示3个化合物具有相对较高的热稳定性。可见光照射条件下化合物1对罗丹明B具有一定的催化降解能力。此外,直流磁化率结果显示化合物1中金属离子之间存在反铁磁相互作用。     

含取代基苯基羧酸与柔性含氮配体构筑的三个过渡配位化合物的合成、晶体结构与物理性质（英文）

利用3,5-二硝基苯甲酸(3,5-DNBH),1,2-双咪唑亚甲苯(1,2-bimb)与3种过渡金属盐通过水热反应成功地构筑3个过渡金属配位化合物,即[M(3,5-DNB)2(1,2-bimb)](M=Co(Ⅱ)(1),Cd(Ⅱ)(3))和[Zn(3,5-DNB)2(1,2-bimb)]n(2)。通过红外光谱、元素分析、单晶和粉末X射线衍射表征了这三个化合物。化合物1和3是同构的,含有一个双核单元[M2(COO)2],该双核单元由金属离子、3,5-二硝基苯甲酸根以及1,2-bimb分子构成。双核单元再通过O…π弱相互作用形成超分子结构,该弱相互作用是通过3,5-二硝基苯甲酸根上的硝基氧原子与1,2-bimb上的苯环所形成。化合物2是一维链结构,链与链之间再通过3,5-二硝基苯甲酸根和1,2-双咪唑亚甲苯配体上苯环之间的π…π相互作用,形成了一个超分子结构。室温条件下研究了化合物2和3分散在甲醇中的荧光性质。热重测试结果显示3个化合物具有相对较高的热稳定性。可见光照射条件下化合物1对罗丹明B具有一定的催化降解能力。此外,直流磁化率结果显示化合物1中金属离子之间存在反铁磁相互作用。     

含有未配位羧基的吡唑羧酸基镉和铜的配合物的合成、晶体结构和荧光性能

以菲咯啉和3,5-二甲基-1-羧甲基-4-吡唑甲酸为配体,合成了2个新的配合物[Cd（Hcmdpca）₂（phen）（H₂O）]（1）和[Cu₂（Hcmdpca）₂（phen）₄（NO₃）₂]·4H₂O（2）（H₂cmdpca=3,5-二甲基-1-羧甲基-4-吡唑甲酸;phen=菲咯啉）,并用红外光谱、元素分析、热重分析和X射线单晶衍射结构分析等对其进行了表征。配合物1和2都属于单斜晶系,1和2的空间群分别为C2/c和P2₁/c。配合物1的镉离子采取七配位的方式,Hcmdpca-阴离子桥联2个镉离子形成一个双核结构;这些双核结构单元间通过分子间氢键及π-π相互作用构成一个三维的超分子结构。配合物2是一个由2个分立的单核铜配阳离子构成的独立单元,铜离子位于一个畸变的八面体构型中;这些单核铜配阳离子和硝酸根通过静电引力和分子间氢键作用,进一步形成一个三维的超分子结构,而溶剂水分子填充在该结构的空隙中。此外还考察了1和2的热稳定性和固体荧光性质。     

混合配体构筑的配位聚合物的合成、结构与荧光性质

在溶剂热条件下,利用Cd（Ⅱ）、Co（Ⅱ）在混配体体系下合成出3个结构新颖的配位聚合物[Cd₃（pic）₄（H₂bmimb）]_n（1）,[Co₃（pic）₄（H₂bmimb）]_n（2）和[Cd₂（1,2-mbix）（pic）₂（H₂O）₂]_n（3）（pic=5-苯基间苯二甲酸;H₂bmimb=1,4-二（（2-甲基咪唑）亚甲基）苯;1,2-mbix=1,2-二（（2-甲基咪唑）亚甲基）苯）,并通过单晶X射线衍射、红外光谱、热重分析、元素分析、粉末X射线衍射和荧光光谱等对配合物进行了表征。配合物1和2中金属离子Cd²⁺、Co²⁺均与pic配体形成了三维阴离子骨架,双质子化的双咪唑配体位于骨架中平衡骨架电荷。配合物3中,Cd²⁺金属中心与pic、1,2-mbix配体配位形成一维链,链与链之间通过苯环间的π…π堆积形成二维层,进而通过氢键形成三维超分子结构。配合物1和3表现出良好的荧光性质。     

4’-（3-甲氧基-4-羟基苯基）-2，2’：6’，2″-三联吡啶及其铜、锌配合物的合成、结构和性质

通过一锅反应制备了4’-（3-甲氧基-4-羟基苯基）-2,2’：6’,2″-三联吡啶（L）,通过重结晶的方法得到了其醋酸盐单晶体（HL）（CH₃COO）（1）,并以L为配体组装了过渡金属配合物[Cu（NO₃）（CH₃OH）L]（NO₃）（2）和[Zn（NO₃）₂L]（C₂H₅OH）（3）,通过元素分析、IR光谱和单晶X-射线衍射等表征了3个化合物的结构。结果表明,化合物1中,三联吡啶环呈反-反构型,而在2和3中,三联吡啶环呈现出顺-顺构型,然后采取三齿螯合模式连接金属离子形成单核单元。3个化合物中,三联吡啶分子之间以及它们与溶剂分子之间形成的氢键、π-π堆积和范德华力等相互作用将化合物1~3的单核单元连接形成三维网状结构。     

基于偶氮联吡啶配体的银和钴配位聚合物的构筑与性质

通过将2个4,4’-联吡啶基团用偶氮基团连接,我们合成了新的配体顺式-和反式-1,2-二（（4,4’-联吡啶）-3-氮烯）（cis-L和trans-L）,并利用trans-L与银离子和钴离子构筑了配位聚合物{[Ag₂（trans-L）（ClO₄）₂]·4CH₃CN}_n（1）和{[Co（trans-L）₂（H₂O）₂]（ClO₄）₂}_n（2）。其中1为一维梯形链,链与链之间通过π-π以及Ag…Ag相互作用堆积;2为三维无限dendrimer结构,其Co中心具有合适的氧化还原电位,在以荧光素为光敏剂的条件下,可作为光催化剂实现光解水放氢。     

基于6-(3，5-二羧基苯基)烟酸金属有机配位聚合物的构筑及其荧光识别性能

利用混合配体设计、合成了2种新颖的金属有机配位聚合物：[Cd（HDCPN）（1,4-bib）_0.5（H₂O）₂]_n（1）和{[Zn（HDCPN）（1,2bimb）]·H₂O}_n（2）（H₃DCPN=6-（3,5-二羧基苯基）烟酸,1,4-bib=1,4-二（1-咪唑基）苯,1,2-bimb=1,2-二（咪唑-1-基甲基）苯）,并通过单晶X射线衍射、红外光谱（IR）、热重分析（TG）和粉末衍射对配合物1和2进行结构表征。结构分析表明1和2都显示一维链结构,并通过π…π作用堆积成三维网络空间结构。进一步研究了配合物1和2的荧光性能及1在水溶液中对阳离子和阴离子的识别。荧光检测显示,配合物1在水溶液中高灵敏识别Fe³⁺、Cr₂O₇^2-和CrO₄^2-离子。同时研究了配合物1对Fe³⁺、Cr₂O₇^2-和CrO₄^2-的荧光猝灭机理。     

氰基桥联的Fe(Ⅲ)-Mn(Ⅱ)双金属链的可控组装和磁性作用的调控

基于不同位阻的三氰基构筑单元和双齿配体,合成了2个氰基桥联的Fe（Ⅲ）-Mn（Ⅱ）链状化合物。利用不同的结构扭曲类型调控了它们的磁性相互作用。化合物{[Fe（Ⅲ）（PzTp）（CN）₃][Mn（Ⅱ）（5,5’-dmbpy）₂]ClO₄}_n（1;PzTp=tetrakis（pyrazolyl）borate;5,5’-dmbpy=5,5’-dimethyl-2,2’-bipyridine）显示为左右手螺旋链的一维2,2-CC链状结构并且表现出亚铁磁行为。化合物{[Fe（Ⅲ）（Tp^*）（CN）₃]₂[Mn（Ⅱ）（dpqc）]·CH₃OH·H₂O}_n（2;Tp^*=hydridotris（3,5-dimethylpyrazolyl）borate;dpqc=dipyrido[3,2-a：2’,3’-c]-（6,7,8,9-tetrahydro）phenazine）具有一维4,2-带状的双链结构并且表现出典型的反铁磁性相互作用。     

基于偶氮联吡啶配体的银和钴配位聚合物的构筑与性质

通过将2个4,4''-联吡啶基团用偶氮基团连接,我们合成了新的配体顺式-和反式-1,2-二（（4,4''-联吡啶）-3-氮烯）（cis-L和trans-L）,并利用trans-L与银离子和钴离子构筑了配位聚合物{[Ag₂（trans-L）（ClO₄）₂]·4CH₃CN}_n（1）和{[Co（trans-L）₂（H₂O）₂]（ClO₄）₂}_n（2）。其中1为一维梯形链,链与链之间通过π-π以及Ag…Ag相互作用堆积;2为三维无限dendrimer结构,其Co中心具有合适的氧化还原电位,在以荧光素为光敏剂的条件下,可作为光催化剂实现光解水放氢。     

基于柔性双吡啶双酰胺和两种不同多羧酸配体的三个Cu（Ⅱ）/Co（Ⅱ）配位聚合物：组装、结构和性质

通过水热合成得到3个有机金属配位聚合物,即[Cu（1,2-BDC）（L）]（1）,[Cu（HBTC）（L）]·2H₂O（2）,[Co（HBTC）（L）]·H₂O（3）,（L=N,N-双（3-氨基吡啶）乙二酰胺,1,2-H₂BDC=1,2-邻苯二甲酸和H₃BTC=1,3,5-均苯三甲酸）。配合物1是基于1D[Cu-1,2-BDC]_n和[Cu-L]_n链形成的一个3DCdSO₄-型拓扑结构。配合物2~3是同构的,均显示出2D双层（3,5）-连接的{4²·6⁷·8}{4²·6}拓扑结构。相邻的2D双层网络通过分子间的氢键（配合物2）和π-π堆积（配合物3）作用进一步拓展成3D超分子框架。我们对芳香羧酸和中心金属离子对配合物结构的影响进行了详细的讨论。此外,还研究了配合物1~3的电化学性质和固态荧光性质。     

Organogermyl,Organostannyl, and Organoplumbyl Phosphines,Arsines, Stibines,and Bismuthines

The preparation, properties, and reactions of the compounds named in the title are described, with particular reference to the possible participation of (p→d)_π components in the bonding between the group IVB and the group VB elements.     

Pyrenes,Peropyrenes, and Teropyrenes: Synthesis,Structures, and Photophysical Properties

The design of a relatively simple and efficient method to extend the π‐conjugation of readily available aromatics in one‐dimension is of significant value. In this paper, pyrenes, peropyrenes, and teropyrenes were synthesized through a double or quadruple benzannulation reaction of alkynes promoted by Brønsted acid. This novel method does not involve cyclodehydrogenation (oxidative aryl–aryl coupling) to arrive at the newly incorporated large arene moieties. All of the target compounds were synthesized in moderate to good yields and were fully characterized with the structures unambiguously confirmed by X‐ray crystallography. As expected, photophysical characterization clearly shows increasing red‐shifts as a function of extended conjugation within the fused ring systems.     

Pyrenes,Peropyrenes, and Teropyrenes: Synthesis,Structures, and Photophysical Properties

The design of a relatively simple and efficient method to extend the π‐conjugation of readily available aromatics in one‐dimension is of significant value. In this paper, pyrenes, peropyrenes, and teropyrenes were synthesized through a double or quadruple benzannulation reaction of alkynes promoted by Brønsted acid. This novel method does not involve cyclodehydrogenation (oxidative aryl–aryl coupling) to arrive at the newly incorporated large arene moieties. All of the target compounds were synthesized in moderate to good yields and were fully characterized with the structures unambiguously confirmed by X‐ray crystallography. As expected, photophysical characterization clearly shows increasing red‐shifts as a function of extended conjugation within the fused ring systems.     

Structural, magnetic, and spectroscopic studies of YAgSn, TmAgSn, and LuAgSn

The rare earth-silver-stannides YAgSn, TmAgSn, and LuAgSn were synthesized from the elements by arc-melting and subsequent annealing. The three stannides were investigated by X-ray powder and single-crystal diffraction: NdPtSb type, P6₃mc, Z=2, a=468.3(1), pm, wR₂=0.0343, 353 F² values, 12 variables for YAgSn, and ZrNiAl type, P6¯2 m, a=726.4(2), , wR₂=0.0399, 659 F² values, 15 variables for TmAgSn, and a=723.8(2), , wR₂=0.0674, 364 F² values, 15 variables for LuAgSn. Besides conventional laboratory X-ray data with monochromatized Mo radiation, the structures were also refined on the basis of synchrotron data with , in order to clarify the silver-tin ordering more precisely. YAgSn has puckered, two-dimensional [AgSn] networks with Ag-Sn distances of 278 pm, while the [AgSn] networks of TmAgSn and LuAgSn are three-dimensional with Ag-Sn distances of 279 and 284 pm for LuAgSn. Susceptibility measurements indicate Pauli paramagnetism for YAgSn and LuAgSn. TmAgSn is a Curie-Weiss paramagnet with an experimental magnetic moment of 7.2 μ_B/Tm. No magnetic ordering is evident down to 2 K. The local environments of the tin sites in these compounds were characterized by ¹¹⁹Sn Mössbauer spectroscopy and solid-state NMR (in YAgSn and LuAgSn), confirming the tin site multiplicities proposed from the structure solutions and the absence of Sn/Ag site disordering. Mössbauer quadrupolar splittings were found in good agreement with calculated electric field gradients predicted quantum chemically by the WIEN2k code. Furthermore, an excellent correlation was found between experimental ¹¹⁹Sn nuclear magnetic shielding anisotropies (determined via MAS-NMR) and calculated electric field gradients. Electronic structure calculations predict metallic properties with strong Ag-Sn bonds and also significant Ag-Ag bonding in LuAgSn.     

Borinium, borenium, and boronium ions: synthesis, reactivity, and applications

Boron cations are elusive and highly electrophilic species that play a key role in the chemistry of boron. Despite early interest in the chemistry of boron cations, until recently they have largely remained chemical curiosities. However, hints at harnessing their potential as potent electrophiles have begun to appear and developments in weakly coordinating anion technology suggest that this is an area of research that is ripe for exploration. It has been nearly 20 years since the last major review on boron cations; herein we summarize the progress in the area since that time.     

Pi bonding and negative hyperconjugation in mono-, di-, and triaminoborane, -alane, -gallane, and -indane

A systematic quantum chemical investigation of mono-, di-, and triaminoborane, -alane, -gallane, and -indane is carried out to determine quantitatively the effects of pi bonding and negative hyperconjugation on structures, energetics, and rotational barriers in these systems. Pi bonding plays a significant role in the aminoborane compounds, but becomes rapidly less significant in the aminoalanes, -gallanes, and -indanes. For each main-group metal X investigated, X-N rotational barriers are found to be essentially equal depending only on the number of remaining in-plane amino groups. The contribution of negative hyperconjugation to reducing rotational barriers, as assessed from natural bond orbital (NBO) delocalization energies, is independent of the pyramidalization of the out-of-plane amino group, and is also dependent only on the number of rotated groups. Optimized tris[bis(trimethylsilyl)amino]-substituted structures of boron, aluminum, gallium, and indium are found to compare quite well with available experimental structural data, and exhibit X-N torsion angles that are independent of the central metal atom.     

Transition-metal-free O-, S-, and N-arylation of alcohols, thiols, amides, amines, and related heterocycles

A new protocol for the Ullmann-type arylation process of different aromatic heterocycles without any transition-metal catalyst, implying the use of a combination of an excess of potassium hydroxide and dimethyl sulfoxide, is described. The reaction can be performed between a broad range of starting nucleophiles including phenol, alcohols, amines, nitrogen-containing five-membered systems such as pyrazoles, imidazoles, and indoles, and amides with haloarenes, iodide and bromide derivatives giving the best results, the possible pathway involving the in situ generation of the corresponding benzyne intermediate. When the reaction was performed with 2-iodoaniline and either carboxamides or isothiocyanato derivatives, the corresponding benzoazole derivatives were obtained.     

铬,硒,镉,锰与心脑血管疾病

通过对５０例心脑血管疾病病人及５０例健康对照组血中微量元素铬、硒、镉、锰的检测分析证实，心脑血管疾病病人血清Ｃｒ、Ｓｅ含量下降，Ｃｄ含量未见明显升高，并进一步探讨了这些微量元素与心脑血管疾病的发生发展的关系及其临床意义。     

Rare-Earth-compound nanowires, nanotubes, and fullerene-like nanoparticles: synthesis, characterization, and properties

Various low-dimensional nanostructures, such as nanowires, nanotubes, nanosheets, and fullerene-like nanoparticles have been selectively synthesized from rare-earth compounds (hydroxides, fluorides) based on a facile hydrothermal method. The subsequent dehydration, sulfidation, and fluoridation processes lead to the formation of rare-earth oxide, oxysulfide, and oxyhalide nanostructures, which can be functionalized further by doping with other rare-earth ions or by coating with metal nanoparticles. Owing to the interesting combination of novel nanostructures and functional compounds, these nanostructures can be expected to bring new opportunities in the vast research areas of and application in biology, catalysts, and optoelectronic devices.