Bis(μ-N-benzyl-N-furfuryldithiocarbamato)-1:2κ3 S,S′:S′;2:1κ3 S,S′:S′-bis[(N-benzyl-N-furfuryldithiocarbamato-κ2 S,S′)cadmium]

In the centrosymmetric title compound, [Cd2(C13H12NOS2)4], pairs of dithiocarbamate ligands exhibit different structural functions. Each of the terminal ligands is bidentately coordinated to one CdII atom and forms a planar four-membered CS2Cd chelate ring, whereas pairs of the tridentate bridging ligands link two neighbouring CdII atoms, forming extended eight-membered C2S4Cd2 tricyclic units whose geometry can be approximated by a chair conformation. The coordination polyhedron of the CdII atoms is a distorted square-pyramid. The five-membered furan ring and the benzene ring are disordered over two sets of sites with an occupancy ratio of 0.62 (8):0.38 (8).

In the centrosymmetric title compound, [Cd 2 (C 13 H 12 NOS 2 ) 4 ], pairs of dithiocarbamate ligands exhibit different structural functions. Each of the terminal ligands is bidentately coordinated to one Cd II atom and forms a planar fourmembered CS 2 Cd chelate ring, whereas pairs of the tridentate bridging ligands link two neighbouring Cd II atoms, forming extended eight-membered C 2 S 4 Cd 2 tricyclic units whose geometry can be approximated by a chair conformation. The coordination polyhedron of the Cd II atoms is a distorted square-pyramid. The five-membered furan ring and the benzene ring are disordered over two sets of sites with an occupancy ratio of 0.62 (8):0.38 (8).

Comment
The solid state structural chemistry of the group XII 1,1-dithiolates is rich and fascinating in that different structural motifs are found ranging from monomeric, dimeric, tetrameric, linear polymeric and layered structures or three-dimensional networks (Tiekink, 2003). There has been recent interest in the metal dithiocarbamate complexes, which can act as single source precursors in the synthesis of novel metal sulfide nanomaterials (Ajibade et al., 2011;Bera et al., 2010;Thomas et al., 2011). The effect of organic substituents on the deposition temperature and deposition mechanisms have been carried out (Pickett et al., 2001). This study shows that the use of dithiocarbamates as single source precursors depends on the nature of the organic substituents of the dithiocarbamate. In view of these importance we report here the first crystal structure of a dinuclear cadmium(II) dithiocarbamate complex with fufuryl substituent. The four sulfur atoms and the cadmium atom are almost coplanar. The bond angles around the cadmium atom are in the range of 67.18 (2)° to 153.03 (3). The Cd-S bond lengths range are 2.5479 (9) to 2.7952 (7) Å and are in good agreement with those reported for other Cd-dithiocarbamate complexes (Ivanov et al., 2006;Onwudiwe et al., 2010;Yin et al., 2004). The Cd-Cd distance, which indirectly reflects the strength of the binuclear structure, is 3.751 Å.
Experimental N-Benzyl-1-(furan-2-yl)methanamine (4 mmol, 0.75 g) in ethanol was mixed with carbon disulfide (4 mmol, 0.3 ml) under ice cold condition. To the resultant yellow dithiocarbamic acid solution, Cd(CH 3 COO) 2 2H 2 O (2 mmol, 0.533 g) in water was added with constant stirring. The solid which precipitated was washed several times with cold water and then dried.
Crystals were obtained by the slow evaporation from the solution of title compound in acetonitrile:dichloro-methane (3:1) solvent mixture (m.p. 419 K).

Refinement
All H atoms were positioned with idealized geometry and were refined isotropic using a riding model with C-H distances of 0.93-0.97 Å and with U iso (H) = 1.2Ueq(C]. The five-membered ring (C19, O20,C21-C23 and benzene ring (C25-C30) weare disordered and were refined using a split model and site occupancy factors of 0.62 (8) and 0.38 (8) using restraints.
The atoms of lower occupancy were refined only isotropic.  (6)