Mikhail M. Degtyarik

catena-Poly[[[cis-bis(1-phenyltetrazole-κN4)copper(II)]-di-μ-chloro] hemi(1 -phenyltetrazole)]

The title compound, {[CuCl 2 (PhTz) 2 ].0.5PhTz} n (PhTz is 1-phenyltetrazole, C 7 H 6 N 4 ), has a polymeric structure, with uncoordinated disordered PhTz molecules in the cavities. The coordination polyhedron of the Cu atom is a highly elongated octahedron. The equatorial positions are occupied by two Cl atoms [Cu-Cl = 2.2687 (9) and 2.2803(7)A] and two N atoms of the PhTz ligands [Cu-N = 2.0131 (19) and 2.0317 (18) A]. The more distant axial positions are occupied by two Cl atoms [Cu-Cl = 3.0307 (12) and 2.8768 (11) A] that lie in the equatorial planes of two neighbouring Cu octahedra. The [CuCl 2 (PhTz) 2 ] units are linked by Cu-Cl bridges into infinite chains extending parallel to the a axis. The chains are linked into two-dimensional networks by intermolecular C-H...N interactions between the phenyl and tetrazole fragments, and by face-to-face π-π interactions between symmetry-related phenyl rings. These two-dimensional networks, which lie parallel to the ac plane, are connected by intermolecular π-π stacking interactions between phenyl rings, thus forming a three-dimensional network.

trans-Dichloridotetrakis­[1-(2-hydroxy­ethyl)-1H-tetrazole-κN4]cobalt(II)

The title cobalt(II) complex, [CoCl2(C3H6N4O)4], was obtained from metallic cobalt by direct synthesis. There are two Co atoms in the asymmetric unit, each lying on an inversion centre and adopting a distorted octahedral coordination. Classical and non-classical hydrogen bonds are responsible for formation of a three-dimensional polymeric network in the crystal.

Synthesis, structure, and characterizations of a new antiferromagnetic manganese(II) dichloro-bridged 1-D polymer decorated by 5-amino-1-H-tetrazole

[Mn(5-ATZ)2Cl2]n (1) (5-ATZ – 5-amino-1-H-tetrazole) was synthesized from the reaction of 5-ATZ and manganese(II) chloride and isolated by solution evaporation at room temperature. 1 was characterized by elemental analysis, X-ray crystallography, infrared, and EPR spectroscopy as well as magnetic measurements. In the crystal structure, [Mn(5-ATZ)2Cl2] units are linked by double μ2-bridging chlorides to form 1-D chains parallel to the a-axis. The Mn sphere approximates to octahedral with the metal coordinated by four chlorides in the equatorial plane and two 5-ATZ molecules, bound through their ring nitrogens, in axial positions. The intramolecular N–H···Cl hydrogen bond between the 5-ATZ amino group and the adjacent coordinated Cl− stabilizes the chain. N–H···N hydrogen bonds between adjacent chains form a 3-D supramolecular framework. No hyperfine coupling to the Mn nuclei (I = 5/2) is observed in the powdered EPR spectrum of 1 at 77 K. The frozen solution EPR spectrum provides evidence of the mononuclearity of 1 in methanol. The magnetic properties have been analyzed using the Hamiltonian H = –J∑Si · Si+1 with J = −1.38(3) cm−1 and g = 2.00(1). A small value of the exchange parameter is typical for 1-D six-coordinate bis(μ2-chloro) Mn(II) polymers.

Chain structure of catena-poly­[[bis­[cis-1-(2,4,6-tri­methyl­phenyl)­tetrazole-κN4]copper(II)]-di-μ-chloro]

In the title compound, [CuCl2(C10H12N4)2]n, the coordination polyhedron of the Cu atom is an elongated octahedron. Its equatorial positions are occupied by two Cl atoms [Cu—Cl 2.2767 (8) and 2.2669 (8) A] and two N4 atoms of substituted tetrazole ligands [Cu—N4 2.016 (2) and 2.038 (2) A]. The axial positions are occupied by two Cl atoms [Cu—Cl 2.9769 (11) and 2.8995 (11) A], which belong to the equatorial planes of two neighbouring Cu atoms. Thus, the [CuCl2(C10H12N4)2] units form infinite chains, extended along the a axis, which are linked together only by van der Waals interactions. The skeleton of each chain consists of Cu and Cl atoms.