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Multifunctionality and size of the chloranilate ligand define the topology of transition metal coordination polymers

A series of eight novel complexes of chloranilic acid (CA) with the first-row transition metals (M = Mn, Cr, Ni, Co) were prepared and characterised by single-crystal X-ray diffraction, IR spectroscopy and polycrystalline X-band electron spin resonance (ESR) spectroscopy. All studied complexes revealed the distorted octahedral arrangements. Three coordination modes of chloranilate ligand are observed: bidentate, bis(bidentate) and a novel one acting as a mono + bidentate bridging, which can easily be distinguished by IR spectra. The size of the metal atom and different modes of chloranilate coordination affect crystal-packing topologies: 0D (mononuclear or dinuclear) and 1D (zig-zag chains or ladder-like tapes). However, the ancillary ligands are of minor influence on the topology of the systems studied.

chloranilic acid ; coordination polymers ; crystal structure ; crystal engineering

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