Isomerism in Coordination Complexes and Polymers Derived from Bispyridylurea Ligands: Effect of Solvents, Conformational Flexibility, and Positional Isomerism of the Ligands
Isomerism in Coordination Complexes and Polymers Derived from Bispyridylurea Ligands: Effect of Solvents, Conformational Flexibility, and Positional Isomerism of the Ligands
复制标题
DOI：
10.1021/cg070301l
复制
发表时间：
2007-10
影响因子：
3.8
通讯作者：
D. Kumar;and Amitava Das;P. Dastidar
中科院分区：
文献类型：
--
作者：
D. Kumar;and Amitava Das;P. Dastidar
Cd（NO_3）_2·6H_2O与N，N'-双（2-甲基苯基）咪唑的反应（3-吡啶基）脲（3bpu）/N，N'-双（4-吡啶基）脲（4bpu）与1：2金属：不同溶剂体系下的配体比例（极性/非极性）得到了四个独立的配合物，分别为[{（H2O）2Cd（3bpu）4}·（NO3）2·2H2O·X] 1，[{（H2O）2Cd（3bpu）4}·（NO3）2] 3，[{（H2O）2 Cd（3bpu）4}·（NO3）2·2H2O·p-xylene] 4、[{（H2O）2（NO3）2 Cd（μ-4bpu <$2}] 8和四种配位聚合物，[{（H2O）3（NO3）Cd（μ-3bpu）}·（NO3）·H2O·1/2邻二甲苯] n2，[{（H2O）3（NO3）Cd（μ-3bpu）}·（NO3）·X] n5，[{（NO3）2Cd（μ-3bpu <$2}] n 6，[{（H2O）（NO3）Cd（μ-4bpu <$2}·（NO3）·EtOH·硝基苯] n 7，其主要特征在于通过单晶X射线衍射。溶剂，构象的灵活性，和位置异构的配体上的各种异构现象（超分子异构和多态性）的影响进行了讨论。
Reactions between Cd(NO3)2·6H2O and N,N‘-bis(3-pyridyl)urea (3bpu)/N,N‘-bis(4-pyridyl)urea (4bpu) with a 1:2 metal:ligand ratio under various solvent systems (polar/nonpolar) afforded four discrete coordination complexes, namely, [{(H2O)2Cd(3bpu)4}·(NO3)2·2H2O·X] 1, [{(H2O)2Cd(3bpu)4}·(NO3)2] 3, [{(H2O)2Cd(3bpu)4}·(NO3)2·2H2O·p-xylene] 4, [{(H2O)2 (NO3)2Cd(μ-4bpu)2}] 8, and four coordination polymers, namely, [{(H2O)3(NO3)Cd(μ-3bpu)}·(NO3)·H2O·1/2o-xylene]n 2, [{(H2O)3(NO3)Cd(μ-3bpu)}·(NO3)·X]n 5, [{(NO3)2Cd(μ-3bpu)2}]n 6, [{(H2O)(NO3)Cd(μ-4bpu)2}·(NO3)·EtOH·nitrobenzene]n 7, which were mainly characterized by single-crystal X-ray diffractometry. The effect of solvents, conformational flexibility, and positional isomerism of the ligands on the various isomerisms (supramolecular isomerism and polymorphism) is discussed.