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Abstract: Complexes ML1 2 and ML2 2, with M=FeII, CoII, NiII, and 1,3-bis(2-R-tetrazol-5-yl)triazenide ligands L1 (R=Me) and L2 (R= tBu), have been synthesized by the reaction of corresponding 1,3-bis(2-R-tetrazol-5-yl)triazenes with metal(II) salts in basic media and characterized by IR, UV–Vis spectroscopy, thermal and X-ray diffraction analyses. Both 1,3-bis(2-R-tetrazol-5-yl)triazenes were found to deprotonate on coordination and act as tridentate chelating ligands forming distorted MN6 octahedra around metal(II) cations. [ABSTRACT FROM AUTHOR]

Abstract: Tetrazol-2-ylacetic acid (2-TzaH) was found to react with CuCl2, PdCl2, and K2PtCl4 in water giving Cu(2-Tza)2, PdCl2(2-TzaH)2·2H2O and PtCl2(2-TzaH)2, correspondingly. Obtained complexes, being the first reported examples of coordination compounds derived from 2-TzaH, have been characterized by IR spectroscopy, thermal and X-ray diffraction methods. 2-TzaH was found to act as a monodentate ligand coordinated to the metal ion via N4 atom of heteroring in palladium complex and as tridentate bridging ligand coordinated via N4 atom and two oxygen atoms in copper complex. Cu(2-Tza)2 presents 2D coordination polymer, whereas PdCl2(2-TzaH)2·2H2O is molecular complex. [Copyright &y& Elsevier]

While bis(1-methyl-1 H-tetra­zol-5-yl)diazene, C4H6N10, (I), has no crystallographically imposed symmetry, in the two title chloro­copper(I) complexes, [Cu2Cl2(C4H6N10)] n, (II), and [CuCl(C4H6N10)] n, (III), the organic ligands lie across centres of inversion; in (III), the Cu and Cl atoms additionally lie about a twofold rotation axis in the space group P2/ c. Complex (II) forms a two-dimensional coordination polymer containing tetra­hedrally coordinated CuI atoms, and complex (III) forms a one-dimensional coordination polymer containing five-coordinate square-pyramidal CuI atoms. [ABSTRACT FROM AUTHOR]

While bis(1-methyl-1 H-tetra­zol-5-yl)diazene, C4H6N10, (I), has no crystallographically imposed symmetry, in the two title chloro­copper(I) complexes, [Cu2Cl2(C4H6N10)] n, (II), and [CuCl(C4H6N10)] n, (III), the organic ligands lie across centres of inversion; in (III), the Cu and Cl atoms additionally lie about a twofold rotation axis in the space group P2/ c. Complex (II) forms a two-dimensional coordination polymer containing tetra­hedrally coordinated CuI atoms, and complex (III) forms a one-dimensional coordination polymer containing five-coordinate square-pyramidal CuI atoms. [ABSTRACT FROM AUTHOR]