Remarkable Structural Transformation of [Zn(tza)2] During Recrystallization, Syntheses and Crystal Structures of [M(tza)2] (M = Zn, Cd, Mn, Co; Htza = Tetrazole-1-acetic Acid)
journal contributionposted on 06.08.2008 by Wen-Wen Dong, Jun Zhao, Li Xu
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The substitution reactions of M(CH3CH2CO2)2 and Htza afford the crystalline precipitates of [Cd(tza)2] (1), [Mn(tza)2] (2), [Co(tza)2] (3), and β-[Zn(tza)2] (5). The recrystallization of 5 leads to the formation of α-[Zn(tza)2] (4). X-ray powder diffraction of 1−5 reveal that 1, 2, 3, and 5 are allomers, but 4 and 5 are isomers, revealing the unprecedented structural transformation during the process of recrystallization. Compounds 1−4 have been characterized by X-ray single-crystal crystallography, IR, and magnetism analysis. Structural analyses and comparison of 1−4 detail the structural evolution of from β-[Zn(tza)2] (5) to α-[Zn(tza)2] (4) and possible driving force has been proposed. The interactions between the MnII ions of 2 have been observed as weakly antiferromagnetic.