School of Chemistry, University of Hyderabad, Hyderabad, 500046, AP, India.
Dalton Trans. 2010 Feb 28;39(8):1935-40. doi: 10.1039/b920775a. Epub 2009 Dec 24.
Three crystalline compounds, Bi(2-O(2)C-C(5)H(4)N)(3) (), {Bi[(2,6-O(2)C)(2)C(5)H(3)N)][(2-HO(2)C-6-O(2)C)C(5)H(3)N].H(2)O}(n) (3) and Bi(O(2)CC(9)H(6)N)(2)(O(3)N)(O(2)CC(9)H(6)NH).2H(2)O () have been prepared by simple reactions in aqueous medium using the readily available bismuth nitrate and the corresponding acids, picolinic acid, dipicolinic acid and quinaldic acid. While and are coordination polymers with bismuth in tricapped trigonal prismatic and dodecahedral environments, compound is a monomeric species with dodecahedral geometry at bismuth. Compound represents a second crystalline form of a recently reported structure with subtle differences in bond parameters, and highlights the flexibility in structural motifs during crystallization. Compound involves skeletons with dimeric [Bi(2)O(2)] and trimeric [BiOCOBiOBiOCO] moieties. In , while the N-protonated carboxylate forms a four-membered chelate ring with bismuth, the other two carboxylates form five-membered ring chelates with the nitrate accounting for the remaining two sites again as a chelate. TGA studies are consistent with the presence of non-coordinated water in and . Compounds and , although insoluble in most of the organic solvents and water, are readily soluble in dilute hydrochloric acid.
三种晶体化合物，Bi(2-O(2)C-C(5)H(4)N)(3) ()，{Bi[(2,6-O(2)C)(2)C(5)H(3)N)][(2-HO(2)C-6-O(2)C)C(5)H(3)N].H(2)O}(n) (3) 和 Bi(O(2)CC(9)H(6)N)(2)(O(3)N)(O(2)CC(9)H(6)NH).2H(2)O ()，通过在水介质中使用易得的硝酸铋和相应的酸，即吡啶甲酸、联吡啶酸和喹哪啶酸，通过简单反应制备而成。和是具有三帽三角棱柱和十二面体环境的铋配位聚合物，而化合物是具有十二面体几何形状的单体物种。化合物代表了最近报道的结构的第二种晶型，在键参数上有细微差异，突出了结晶过程中结构基元的灵活性。化合物涉及具有二聚体[Bi(2)O(2)]和三聚体[BiOCOBiOBiOCO]部分的骨架。在化合物中，虽然 N-质子化的羧酸盐与铋形成四元螯合环，但另外两个羧酸盐与硝酸盐形成五元螯合环，其余两个位置再次作为螯合占据。TGA 研究与和中存在非配位水一致。化合物和虽然不溶于大多数有机溶剂和水，但易溶于稀盐酸。
