Synthesis and structural study of alkali metal complexes derived from 1-phenyl-tetrazole-thiolate and crown ethers
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Add time:07/20/2019 Source:sciencedirect.com
The reaction between 1-phenyl-tetrazole-5-thione (1) and the metal hydroxides MOH (M = Li, Na, K, Rb, Cs) in the presence of crown ethers led to the alkali metal complexes, [Li(15-crown-5)(SCN4Ph)] (2), [Na(15-crown-5)(SCN4Ph)] (5), [K(18-crown-6)(SCN4Ph)] (4), [Rb(18-crown-6)(SCN4Ph)] (5), [Cs(15-crown-5)2][SCN4Ph] (6), [{Cs(15-crown-5)(SCN4Ph)}] (6a), [Cs(18-crown-6)(SCN4Ph)] (7), [Cs(dibenzo-24-crown-8)(SCN4Ph)] (8) and [Cs2(dibenzo-24-crown-8)3(SCN4Ph)2] (8a). Compounds 2–8 were characterized by physical and analytical methods. X-ray diffraction studies performed on these compounds reveal that crown ether moiety precludes the ionic lattice formation. The tetrazole anion coordinates to the metal cation in a bidentate N,S fashion in 3–5 with the formation of a four-membered MSCN ring, whereas in 2, monodentate coordination through a N atom is observed. In contrast, cesium complexes 6, 6a, 7, 8 and 8a show a variety of structural arrangements including monomeric, dimeric and polymeric species, depending on the size of crown ether employed.
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