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Nimax, Patrick R.; Sünkel, Karlheinz (2018): Sodium Salts of Substituted Tetracyanocyclopentadienides [C-5(CN)(4)X](-) (X = H, CN, NH2, NO2): Substituent Influence on the Crystal Structures of Potential Coordination Polymers. In: Chemistryselect, Vol. 3, No. 11: pp. 3330-3337
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Abstract

Metathesis reactions of NaCl with the silver salts of substituted tetracyanocyclopentadienides [C-5(CN)(4)X](-) (X = H, CN, NO2, NH2) gives the corresponding sodium salts 1-4. While 1-3 give polymeric networks, held together by Pi-stacking as well as multiply bridging polydentate cyanocyclopentadienides and in part hydrogen bonda, the aminotetracyanocyclo-pentadienide 4 forms only a water-bridged dinuclear complexes, which are connected only by an intensive hydrogen bond network. Quite surprisingly, only the NO2-substituent in 3 coordinates to Na+ besides the cyano groups, while the NH2 group in 4 is only involved in hydrogen bonds.