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Dithiocarbamatocarboxylate (DTCC) Ligands-Building Blocks for Hard/Soft-Heterobimetallic Coordination Polymers
Phil Liebing1, Juliane Witzorke1, Florian Oehler2
1Chemisches Institut der Otto-von-Guericke-Universität, Universitätsplatz 2, 39106 Magdeburg, Germany.
Abstract:
Four zinc/platinum(II) heterobimetallic coordination polymers with dithiocarboxylate-functionalized carboxylate (DTCC) ligands were prepared by different synthetic approaches and characterized by elemental analyses, IR and NMR (1H, 13C, and 195Pt) spectroscopy, thermal analyses coupled with mass spectrometry (TG/DTA/MS), and single-crystal and powder X-ray diffraction studies. Sequential syntheses via the carboxylic acid substituted platinum dithiocarbamates and zinc acetate revealed crystalline products in good to excellent yields. One-pot preparations from potassium DTCC salts, K2PtCl4, and ZnCl2 led to comparable products, thus demonstrating the high selectivity of the two donor groups toward platinum(II) and zinc. [SSC-N(Me)CH2COO]2- and [SSC-N(CH2COO)(CH2COOH)]2-, DTCC ligands derived from sarcosine and iminodiacetic acid, respectively, were found to form planar zigzag chains with zinc and platinum(II) ions, while the use of the l-proline-derived ligand [SSC-NC4H7COO]2- results in a helical structure. In the case of [SSC-N(CH2COO)2]3-, two-dimensional arrays are formed. All compounds are thermally stable up to 240-400 °C under nitrogen.
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