Guest Driven Structural Correlations in DPDS [Di(4-pyridyl)disulfide]-Based Coordination Polymers

Three novel coordination polymers have been obtained by the reaction of M(NO3)(2)center dot 6H(2)O (M = Mn-II and Co-II) or FeCl2 center dot 4H(2)O with KNCS and DPDS [di(4-pyridyl)disulfide] ligand, [Mn(NCS)(2)(DPDS)(2)](2)center dot DPDS center dot H2O (1), [Fe(NCS)(2)(DPDS)(2)]center dot 3H(2)O (2), and [Co(NCS)(2)(DPDS)(2)]center dot 2H(2)O (3). The three complexes exhibit infinite linear chain structures, where the metal ions are connected by double N,N'-DPDS bridges, that are further connected through hydrogen bonding to give pseudo-3D structures which contain channels where solvent and/or free DPDS molecules are located. The number and type of these guest molecules will have a determining influence in the final crystal system and space groups adopted for every compound obtained, which will be analyzed. H-bonding promotes interpenetrated 3D networks in 1-3. Characterization by IR, UV-vis, X-ray diffraction, ESR spectroscopy, and magnetic measurements is developed. Slight antiferromagnetic interactions are observed, essentially in the Fe(II) and Co(II) compounds, that are associated with the double DPDS bridges.