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New zinc-glycine-iodide complexes as a product of equilibrium and non-equilibrium crystallization in the Gly – ZnI2 – H2O system
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SYSNO ASEP 0459583 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title New zinc-glycine-iodide complexes as a product of equilibrium and non-equilibrium crystallization in the Gly – ZnI2 – H2O system Author(s) Tepavitcharova, S. (BG)
Havlíček, D. (CZ)
Matulková, I. (CZ)
Rabadjieva, D. (BG)
Gergulova, R. (BG)
Plocek, Jiří (UACH-T) RID, ORCID, SAI
Němec, I. (CZ)
Císařová, I. (CZ)Number of authors 8 Source Title Journal of Molecular Structure. - : Elsevier - ISSN 0022-2860
Roč. 1120, SEP (2016), s. 42-49Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords [Zn(gly)I2], [Zn(gly)2I2] ; [Zn3(H2O)4(μ-gly)2I6] ; Crystal structure ; Vibrational spectra ; Thermal behaviour Subject RIV CA - Inorganic Chemistry Institutional support UACH-T - RVO:61388980 UT WOS 000378453100005 EID SCOPUS 84966705294 DOI 10.1016/j.molstruc.2016.05.005 Annotation Equilibrium crystallization of two anhydrous complex compounds, [Zn(gly)2I2] and [Zn(gly)I2], and non-equilibrium crystallization of the [Zn3(H2O)4(μ-gly)2I6] complex have been observed in the Gly - ZnI2 - H2O system at 25°C. Different mixed zinc-glycine-iodide-aqua complexes exist in the studied solutions and those with the highest activity are responsible for the crystallization process. The stable [ZnI2O2(2Gly)]0 complexes are responsible for the large equilibrium crystallization field of the compound [Zn(gly)2I2] (monoclinic system, C2/c space group), in whose crystal structure they are incorporated as discrete distorted electroneutral tetrahedra. In zinc-iodide solutions with a low water activity it is more probable that the glycine zwitterions act as bidentate ligands and form polynuclear complexes. We assume the [ZnI2O2(2/2Gly)]0 infinite chains build the compound [Zn(gly)I2], for which we have found a narrow equilibrium crystallization field. We have failed to describe the crystal structure of this compound because of its limited stability in the air. Non-equilibrium crystallization of [Zn3(H2O)4(μ-gly)2I6] (triclinic system, P-1 space group) was demonstrated, with crystal structure built by trinuclear complexes [ZnI3O(1/2Gly)] [ZnO4(4H2O)O2(2/2Gly)(trans)][ZnI3O(1/2Gly)]. The FTIR and Raman spectra and also the thermal behaviour of the three compounds were discussed. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2017
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