Abstract
The reaction of 2-methyl-thio-5-amino-1,3,4-thia-diazole (Me-SNTD; C3H5N3S2) with copper(II) acetate monohydrate [Cu(OAc)2·H2O; C4H8CuO5] resulted in the formation of the title binuclear compound, [Cu2(C2H3O2)4(C3H5N3S2)2] or [Cu2(OAc)4(Me-SNTD)2]. The structure has triclinic (P ) symmetry with a crystallographic inversion centre located at the midpoint of the line connecting the Cu atoms in the dimer. These two Cu atoms of the dimer [Cu⋯Cu = 2.6727 (6) Å] are held together by four carboxyl-ate groups. Each Cu atom is further coordinated to the N atom of an Me-SNTD mol-ecule and exhibits a Jahn-Teller-distorted octa-hedral geometry. The dimers are connected into infinite chains by hydrogen bonds between the NH (Me-SNTD) and the carboxyl-ate groups of neighbouring mol-ecules, generating an R 2 2(12) ring motif. The mol-ecules are further linked by C-H⋯π inter-actions between the thia-diazole rings and the methyl groups of the acetate units.
Highlights
The reaction of 2-methylthio-5-amino-1,3,4-thiadiazole (Me-SNTD; C3H5N3S2) with copper(II) acetate monohydrate [Cu(OAc)2ÁH2O; C4H8CuO5] resulted in the formation of the title binuclear compound, [Cu2(C2H3O2)4(C3H5N3S2)2] or [Cu2(OAc)4(Me-SNTD)2]
Each Cu atom is further coordinated to the N atom of an Me-SNTD molecule and exhibits a Jahn–Teller-distorted octahedral geometry
The dimers are connected into infinite chains by hydrogen bonds between the NH (Me-SNTD) and the carboxylate groups of neighbouring molecules, generating an R22(12) ring motif
Summary
1,3,4-Thiadazoles are an important class of heterocycles and are of great interest because of their broad spectrum of biological activity. 1,3,4-Thiadiazole derivatives and their metal complexes have been shown to display antimicrobial (Onkol et al, 2008; Abdel-Wahab et al, 2009; Kadi et al, 2010), antituberculosis (Karakuss et al, 2002; Foroumadi et al, 2004), antioxidant (Chitale et al, 2011; Sunil et al, 2010; Khan et al, 2010), anticancer (Padmavathi et al, 2009; Kumar et al, 2010;) and antifungal (Matysiak et al, 2007; Klip et al, 2010; Verma et al, 2011; Zoumpoulakis et al, 2012) activities. 1,3,4-Thiadiazoles exhibit great potential as pesticides in the fields of herbicides, fungicides, insecticides and even as plant-growth regulators. Some of the 1,3,4-thiadiazole-ring-containing ligands can be efficient uptake agents of toxic metal ions (Mincione et al, 1997). Their diverse biological activity possibly arises from the presence of the NCS moiety in the molecule (Orucet al., 2004).
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