First example of bridge mono-coordination mode for the ligand 1,8-bis-(2-pyridyl)-3,6-dithiaoctane (pdto) in a Co(II) tetrahedral complex

The reaction between CoCl2.6H(2)O and the ligand 1,8-bis(2-pyridyl)-3,6-dithiaoctane (pdto) in acetonitrile leads to the formation of the tetrahedral Co(II) complex, [Co(kappa-N-1-pdto)Cl-2]. This compound presents an unusual bridge mono-coordination mode of the tetradentate N2S2 ligand, pdto, not observed with other transition metals before. It was found that the complex presents a similar coordination environment around the Co(II) ion, either in solid sate or in solution, with an important role of chloride ions. Single crystal X-ray diffraction analysis of the compound shows a polymeric structure, where pdto acts as a bimetallic bridge with supramolecular array via intermolecular contacts C-H center dot center dot X, with X = Cl, N and S. (C) 2014 Elsevier Ltd. All rights reserved.