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)2·6H2O (M = MnII and CoII) or FeCl2·4H2O with KNCS and DPDS [di­(4-pyridyl)­disulfide] ligand, [Mn­(NCS)2(DPDS)2]2·DPDS·H2O (1), [Fe­(NCS)2(DPDS)2]·3H2O (2), and [Co­(NCS)2(DPDS)2]·2H2O (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.