Synthesis, crystal and molecular structure, and spectroscopic properties of manganese(II) bis(2,5-diamino-1,3,4-thiadiazole) diaqua dichloride

Abstract

The reaction product of manganese(II) chloride and 2,5-diamino-l,3,4-thiadiazole was prepared and characterized by means of structural, and spectroscopic measurements. The crystals are monoclinic, space group C2/c, with a = 12.~03(4), b = 10.742(2), c = 10.449(5)A,/3 = 92.61(3) ~ and Z = 4. The structure was solved by the heavy-atom method, and least-squares refinement of structural parameters led to a conventional R factor of 0.020 for 1518 independent reflections. The structure consists of discrete molecules with twofold symmetry in which the manganese atom is coordinated in slightly distorted octahedral geometry by two nitrogen, two oxygen and two chlorine atoms.

Tetrakis(2-amino-5-methyl-1,3,4-thiadiazole-N3)chlorocopper(II) chloride monohydrate and tetrakis(2-amino-5-ethyl-1,3,4-thiadiazole-N3)chlorocopper(II) chloride

“…For the thiadiazoles in this structure, Cu atoms bind both heterocyclic N atoms. However, in the known metal(II) halide complexes of thiadiazole derivatives (Mn: Fabretti et al, 1993;Zn: Khusenov et al, 1997;Hg: Antolini et al, 1988), only one N atom is involved in metal coordination. In each case, there are two thiadiazoles per metal and for the ZnCl 2 and HgBr 2 complexes, the geometry is tetrahedral, whereas the addition of two water molecules in the MnCl 2 complex results in octahedral geometry.…”

Structural, vibrational, thermal and magnetic investigation of novel Co(II), Cu(II), Zn(II) and Hg(II) crystalline metal complexes with 2-amino-5-benzylmercapto-1,3,4-thiadiazole: a low weight model of protonated copolymer resin

“…In the last years the structures and spectroscopic behavior of some crystalline 1,3,4-thiadiazole ligands containing -SO 2 NH 2 (sulfonamido) and -SH (thiol) groups at these positions (particularly position 2) and their metal complexes were determined in our laboratory [7][8][9][10][11][12][13][14][15]. The interactions of metal ions with these ligands have been widely studied [16][17][18][19][20][21][22]. We are interested in analyzing ligand versatility, crystal packing, H-bond strength in the lattice, structural modifications, influence of different substituents at ring positions 2 and 5, coordination sites and vibrational, thermal and magnetic behavior of new crystalline metal complexes of 1,3,4-thiadiazole structurally related ligands.…”

Synthesis and characterization of a Cu(II) complex of 2-benzylmercapto-5-methyl-1,3,4-thiadiazole (C10H10N2S2)

“…Interactions of these ligands with metal ions have been widely studied [13][14][15][16][17][18][19][20] and the coordination geometries around the metal ion were found to be square pyramidal, octahedral and square-planar in the 33, 47 and 20% of the cases, respectively. Low molecular weight 1,3,4-thiadiazole derivative thioethers (-S-CH 2 -R) and their metal complexes can be considered as models for studying the coordination behavior of resins based on poly(styrene-codivinylbenzene) that incorporate 2-amino-1,3,4-thiadiazole-5-thiol in its structure, used as efficient uptake agents for toxic metal ions.…”