Copper(II) and cadmium(II) isothiocyanate coordination polymers with 4,4′‐bi‐1,2,4‐triazole |
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Authors: | Evgeniy V. Govor Andrey B. Lysenko Konstantin V. Domasevitch Eduard B. Rusanov Alexander N. Chernega |
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Abstract: | The coordination polymers catena‐poly[[[(4,4′‐bi‐1,2,4‐triazole‐κN1)bis(thiocyanato‐κN)copper(II)]‐μ‐4,4′‐bi‐1,2,4‐triazole‐κ2N1:N1′] dihydrate], {[Cu(NCS)2(C4H4N6)2]·2H2O}n, (I), and poly[tetrakis(μ‐4,4′‐bi‐1,2,4‐triazole‐κ2N1:N1′)bis(μ‐thiocyanato‐κ2N:S)tetrakis(thiocyanato‐κN)tricadmium(II)], [Cd3(NCS)6(C4H4N6)4]n, (II), exhibit chain and two‐dimensional layer structures, respectively. The differentiation of the Lewis acidic nature of CuII and CdII has an influence on the coordination modes of the triazole and thiocyanate ligands, leading to topologically different polymeric motifs. In (I), copper ions are linked by bitriazole N:N′‐bridges into zigzag chains and the tetragonal–pyramidal CuN5 environment is composed of two thiocyanate N atoms and three triazole N atoms [basal Cu—N = 1.9530 (18)–2.0390 (14) Å and apical Cu—N = 2.2637 (15) Å]. The structure of (II) contains two types of crystallographically unique CdII atoms. One type lies on an inversion center in a distorted CdN6 octahedral environment, with bitriazole ligands in the equatorial plane and terminal isothiocyanate N atoms in the axial positions. The other type lies on a general position and forms centrosymmetric binuclear [Cd2(μ‐NCS‐κ2N:S)2(NCS)2] units (tetragonal–pyramidal CdN4S coordination). N:N′‐Bridging bitriazole ligands link the Cd centers into a flat (4,4)‐network. |
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