Tan, Yee Seng * and Siti Nadiah Abdul Halim, and Tiekink, Edward R. T. * (2016) Exploring the crystallization landscape of cadmium bis(N-hydroxyethyl, N-isopropyldithiocarbamate), Cd[S2CN(iPr)CH2CH2OH]2. Zeitschrift für Kristallographie - Crystalline Materials, 231 (2). pp. 113-126. ISSN 2194-4946
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Abstract
Crystallization of Cd[S2CN(iPr)CH2CH2OH]2 from ethanol yields the coordination polymer [{Cd[S2CN(iPr) CH2CH2OH]2}·EtOH]∞ (1) within 3 h. When the solution is allowed to stand for another hour, the needles begin to dissolve and prisms emerge of the supramolecular isomer (SI), binuclear {Cd[S2CN(iPr)CH2CH2OH]2}2·2EtOH (2). These have been fully characterized spectroscopically and by X-ray crystallography. Polymeric 1 has 2-fold symmetry and features dithiocarbamate ligands coordinating two octahedral Cd atoms in a μ2κ2-tridentate mode. Binuclear 2 is centrosymmetric with two ligands being μ2κ2-tridentate as for 1 but the other two being κ2-chelating leading to square pyramidal geometries. The conversion of the kinetic crystallization product, 1, to thermodynamic 2 is irreversible but transformations mediated by recrystallization (ethanol and acetonitrile) to related literature SI species, namely coordination polymer [{Cd[S2CN(iPr) CH2CH2OH]2}3·MeCN]∞ and binuclear {Cd[S2CN(iPr)CH2CH 2 OH]2}2·2H2O·2MeCN, are demonstrated, some of which are reversible. Three other crystallization outcomes are described whereby crystal structures were obtained for the 1:2 co-crystal {Cd[S2CN(iPr)CH2CH2OH]2}2:2[3-(propan- 2-yl)-1,3-oxazolidine-2-thione] (3), the salt co-crystal [iPr NH2(CH2CH2OH)]4[SO4]2{Cd[S2CN(iPr)CH2CH2OH]2}2 (4) and the salt [iPrNH2(CH2CH2OH)]{Cd[S2CN(iPr)CH2CH2OH]3} (5). These arise as a result of decomposition/oxidation of the dithiocarbamate ligands. In each of 3 and 4 the binuclear {Cd[S2CN(iPr)CH2CH2OH]2}2 SI, as in 2, is observed strongly suggesting a thermodynamic preference for this form.
| Item Type: | Article |
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| Additional Information: | First and 2nd authors are with Department of Chemistry, University of Malaya; 3rd author is with Department of Chemistry, University of Malaya and Centre for Chemical Crystallography, Faculty of Science and Technology, Sunway University |
| Uncontrolled Keywords: | cadmium; crystal structure analysis; dithiocarbamate; supramolecular isomerism; X-ray diffraction |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Others > Non Sunway Academics Sunway University > School of Engineering and Technology [formerly School of Science and Technology until 2020] > Research Centre for Crystalline Materials moved to SMLS wef 2021 |
| Depositing User: | Ms. Molly Chuah |
| Related URLs: | |
| Date Deposited: | 25 Oct 2017 08:51 |
| Last Modified: | 07 Oct 2020 09:59 |
| URI: | http://eprints.sunway.edu.my/id/eprint/617 |
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