Synthesis, crystal structure, and thermal property of a novel supramolecular assembly: (NH4)2(C8H10N4O2)4[H4V10O28]·2H2O, constructed from decavanadate and caffeine

Autor:	Hongju Zhai, Shuxia Liu, Hengqing Jia, Jun Peng, Ninghai Hu
Rok vydání:	2004
Předmět:	Crystallography Hydrogen bond Chemistry Supramolecular chemistry Proton NMR Molecule General Chemistry Crystal structure Condensed Matter Physics Single crystal Supramolecular assembly Monoclinic crystal system
Zdroj:	Journal of Chemical Crystallography. 34:541-548
ISSN:	1074-1542
DOI:	10.1023/b:jocc.0000042023.54029.34
Popis:	A novel 3D supramolecular assembly constructed from decavanadate and caffeine building blocks, (NH4)2(C8H10N4O2)4[H4V10O28]·2H2O (1), has been synthesized in aqueous solution and characterized by elemental analysis, IR, 1H NMR, 51V NMR, TG-DTA, and single crystal X-Ray diffraction. The compound 1 crystallizes in monoclinic system, space groupP2 1/n, a = 15.801(1) A, b = 12.914(1) A, c = 15.913(2) A, β = 113.55°,V = 2976.4 (5)A3, Z = 2, R = 0.0498 with 6818 reflections. Water molecules, ammonium ions, and caffeine act as “cement” linking the polyanions into 1D chain along the c-axis by hydrogen bonding. In compound 1, extensive hydrogen-bond contacts and strong π–π interactions lead to an ordered 3D supramolecular framework. TG-DTA curves indicate that the weight loss of the complex can be divided into three stages.
Databáze:	OpenAIRE
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