Abstract
The title compound, [Mn2(C4H5N2O4)2(NCS)2(H2O)4]·4H2O (I), exists as a centrosymmetric dimer. Each dimeric unit consists of tridentate (O,O,N)-chelating Schiff bases with symmetry-maintained μ-O-bridged carboxyl-ate anions, terminally bound thio-cyanate anions, and ligated and solvated water mol-ecules. The complex exhibits a distorted octa-hedron geometry and the centrosymmetric μ-O-bridged carboxyl-ate anions connect the two manganese atoms to form an M 2O2 ring. In the crystal, the mol-ecules are inter-linked via strong N-H⋯O and O-H⋯O hydrogen-bonding contacts and weak O-H⋯S inter-molecular inter-actions, forming a three-dimensional mol-ecular network.
Highlights
The title compound, [Mn2(C4H5N2O4)2(NCS)2(H2O)4]Á4H2O (I), exists as a centrosymmetric dimer
Each dimeric unit consists of tridentate (O,O,N)chelating Schiff bases with symmetry-maintained -O-bridged carboxylate anions, terminally bound thiocyanate anions, and ligated and solvated water molecules
The manganese title compound crystallizes in the monoclinic space group P21/n and exists as a centrosymmetric dimer (Fig. 1)
Summary
Dinitrogen tetrahydride (N2H4), is the simplest diamine and parent of innumerable organic derivatives. Carbazates (esters of hydrazinecarboxylic acid, NH2-NH-COO-R, where R = CH3, C2H5, CH2C6H5 etc) are interesting as ligands in view of their variety of potential donor atoms such as oxygen and nitrogen These neutral molecules can be expected to exhibit only one common coordination mode, i.e. N,O-chelating bidentate. This has been clearly observed in many metal complexes with a variety of anions such as formate (Srinivasan et al, 2011), benzoate (Kathiresan et al, 2012), thiocyanate (Srinivasan et al, 2014a,b), nitrate (Zhang et al, 2005; Srinivasan et al, 2007,2008) and perchlorate (Chen et al, 2016, Sitong et al, 2016) Apart from their coordination ability, alkyl carbazates can undergo condensation reactions; the hydrazinic part of the terminal amine group can react with the carbonyl group of aldehydes or ketones to form Schiff bases. The two manganese atoms are connected via centrosymmetrically related -O-bridged carboxylate anions, forming a rhomboidal Mn2O2 unit about an inversion centre
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