Spontaneous fixation of CO2 by {Ni9} constructed from tauric anion: Synthesis and X-ray structure of [Ni9(NH2CH2CH2SO3)6(CH3CO2)6(H2O)6(OH)6(μ6-CO3)2]4−

New coordination features; a bridging pyridine and the forced shortest non-covalent distance between two CO32−species

“…In such cases, these species usually act essentially as spacers between metals or are subtended by metal ions conforming the external surface of a cage. [38][39][40][41][42][43][44][45][46] In lesser occasions, the incorporated CO 3 2À moieties may be rather considered as being encapsulated inside the coordination cage. [47][48][49][50][51] In any case, two carbonate anions have never been forced to lie so close to each other as within complex 2.…”