Hydrothermal synthesis and novel two-dimensional architecture with fluorescent properties constructed using 2-bromo-1,4-benzenedicarboxylate

A novel two-dimensional complex, [Cu(bbdc)(phen)]·(H₂O)(bbdc = 2-bromo-1,4-benzenedicarboxylate dianion; phen = 1,10-phenanthroline), has been synthesized and structurally characterized by single crystal X-ray analysis. The crystal structure consists of infinite chains of [Cu₂( ₄-bbdc)]²⁺ units connected by bis-monodentate bbdc ligands, the coordination mode of which [ ₄-bbdc] is very rare in the phenyldicarboxylate complexes. The substituent group of bbdc is believed to be the growth key of this coordination network.     

｛[Co(4,4′-bipy)(ambdc)(H_2O)_2](4,4′-bipy)(DMF)｝_n合成与晶体结构

近年来,取代在5位上的间苯二甲酸(取代基为:-SO3H,-NH2,-OH,-NO2等)衍生物与过渡金属形成的配位聚合物,由于其具有新奇的结构,而且是潜在的功能材料而备受关注[1￣4]。Yaghi等人认为,取代基对配位聚合物的结构和性能具有重要的修饰作用[5]。因此我们在研究5-硝基间苯二甲酸、5-羟基间苯二甲酸与过渡金属形成的配位聚合物结构的同时[6,7],选择了5-氨基间苯二甲酸作为酸性配体,氨基不仅能用其氮原子与金属配位,还能形成氢键,能够提供丰富的配位方式。我们曾经报道了｛[Co(4,4′-bipy)(hmbdc)(H2O)2](4,4′-bipy)(DMF)｝n的合成与结构[8…     

超分子三维氢键网络：{[Cu(phen)3](SO4)(H3PCA)2(8H2O)}的晶体结构

A new complex， {[Cu(phen)₃](SO₄)(H₃PCA)₂(8H₂O)}， was synthesized and structurally characterized by single-crystal X-ray analysis. The complex is composed of copper cations， sulfate anions， 1，10-phenanthroline， protocatechuic acid and lattice water molecules. The structure of H₃PCA， SO₄^2- and waters comprises packing of anionic three-dimensional network by hydrogen bonds with cavities. The complex can be considered as a model of host/guest supramolecule. The three-dimensional hydrogen-bonding network is the host species. The Cu(phen)₃²⁺ cations， guest species， occupied the cavities of the host. And the results demonstrate that the form of protocatechuic acid at pH< 1 should be free ligand. CCDC： 191733.     

Hydrothermal Synthesis,Conversion Reaction,and Crystal Structure of 2-D 2-bromo-1,4-benzenedicarboxylate Copper(II) Complex with 2,2′-bipyridine

A fully deprotonated 2-bromo-1,4-benzenedicarboxylate copper(II) complex, [Cu(bbdc)(2,2′-bipy)](H₂O) (bbdc= 2-bromo-1,4-benzenedicarboxylate dianion, 2,2′-bipy=2,2′-bipyridine), was synthesized under hydrothermal conditions. This compound also can be prepared from the partly deprotonated [Cu(Hbbdc)₂(2,2′-bipy)] under basic and hydrothermal conditions. The crystal structure consists of infinite chains of [Cu₂(μ₄-bbdc)]²⁺ building blocks connected by bis-monodentate bbdc ligands and exhibits an extended 2-D architecture. Electronic supplementary material Electronic supplementary material is available for this article at and accessible for authorised users.     

Piperidine–iodine a dual system catalyst for synthesis of coumarin bearing pyrrolo[1,2-a]quinoxaline derivatives via a one-pot three-component reaction

The synthesis of 3-(4-alkyl-4,5-dihydropyrrolo[1,2-a]quinoxalin-4-yl)-2H-chromen-2-one derivatives by a three-component reaction of salicylaldehyde, β-keto esters, and 1-(2-aminophenyl)pyrrole using piperidine–iodine as a dual system catalyst is reported. Good yields, mild reaction conditions, and ease of handling are the main aspects of the method. The structural assignments are supported by ¹H NMR, ¹³C NMR, and X-ray crystallography data.     

A highly diastereoselective five-component synthesis of 1-(alkylimino)-5,5-dicyano-3a-aryloctahydro-3-oxacyclobuta[cd]pentalene-1a,2,5a,5b(2H,3aH)-tetracarboxylates

A novel one-pot, five-component synthesis of 1-(alkylimino)-5,5-dicyano-3a-aryloctahydro-3-oxacyclobuta[cd]pentalene-1a,2,5a,5b(2H,3aH)-tetracarboxylates is described. A mixture of phenacyl bromide, malononitrile, isocyanide, and two equivalents of a dialkyl acetylenedicarboxylate undergoes a novel 1:1:1:2 addition reaction at ambient temperature in absolute ethanol to produce diastereoselectively the title compounds in good yields.     

双偶氮染料光致增色性质及光电导性研究

自Rau[1]首次报道偶氮染料具有光电导性质以来，偶氮染料一直被作为有应用价值的光电导材料而受到人们的重视[2]．特别是近年来发现，偶氮染料具有优良的光存储性能，引起了人们的极大兴趣[3]．但由于一般的偶氮染料吸收波长较短，难与目前普遍使用的激光器波长响应相匹配，从而限制了其使用．因此，如何从分子设计的角度使偶氮染料的吸收向长波方向移动，是目前国际上研究的热点[4，5]．Law等[5]合成了一些二氨基芴酮与萘酚偶合的双偶氮染料，研究了扩大萘酚萘环共轭体系时其吸收的变化情况．本文合成了几个新的双偶氮染料，研究了茶酚酸…     

改进的分子连接性方法

通过用Mulliken键级来加权分子连接性指数中的点价,使分子轨道理论与分子连接性指数有机地结合起来,将分子连接性指数改进成为一种量子拓扑指数。对比发现,分子连接性指数的点价与Mulliken键级具有相近的物理意义,而Mulliken键级更具有独特的优越性。利用改进的分子连接性指数对几种具有代表性的烃类与其体积、疏水常数以及热力学性质进行了关联,得到了满意的结果。