Crystal Structure, Thermal Decomposition Behavior and the Standard Molar Enthalpy of Formation of a Novel 3D Hydrogen- Bonded Supramolecular [Co（HnicO）2·（H2O）2]

• Published in: Chinese journal of chemistry Vol. 25; no. 1; pp. 16 - 19
• Main Author: 曾明华 吴美春 朱立红 梁宏 杨旭武
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 2007; WILEY‐VCH Verlag
• Subjects: 2-羟基烟酸; cobalt complex; hydrogen bond; standard molar enthalpy of formation; supramolecular; thermal decomposition behavior; 晶体结构; 标准摩尔生成焓; 热分解行为; 超分子组装; 钴配合物
• ISSN: 1001-604X; 1614-7065
• DOI: 10.1002/cjoc.200790010

Hydrothermal synthesis and X-ray characterized 3D supramolecular networks were constructed by [Co（HnicO）2·（H2O）2] （HnicOH=2-hydroxynicofinic acid） （1） as building block via abundant dimeric homomeric （N--H…O） and unusually cyclic tetrameric heteromeric （O-H…O） hydrogen-bonds. It is noted that there exist unusually linear metal-water chains comprised of tetrameric units linked by vertexes sharing cobalt centers through hydrogen-bonding. TG-DTG curves illustrated that thermal decomposition was completed by two steps, one is the loss of two terminal water molecules in the range of 156--234℃, and the other is the pyrolysis of HnicO ligand in the range of 234--730 ℃. The standard molar enthalpy of formation of the complex was determined to be （-1845.43± 2.77） kJ·mol^-1 by a rotary-bomb combustion calorimeter.