Polymeric end-to-end bibridged cadmium(II)thiocyanates containing monodentate and bidentate N-donor organic blockers: supramolecular synthons based on π–π and/or C–H⋯π interactions

摘要: Abstract Treatment of Cd(NO3)2 · 4H2O with two equivalents NH4NCS in combination imH [imH=imidazole] or one equivalent pfan [pfan=((pyridin-2-yl)formylidene)aniline] results neutral 1D polymers the type [Cd(imH)2(NCS)(SCN)]n (1) [Cd(pfan)(NCS)(SCN)]n (2). X-ray structure determinations show that both polynuclear 1 and 2, octahedral CdII ions occupy centre symmetry a CdN4S2 chromophore. The metal are linked through N S atoms NCS− alternately doubly bridged end-to-end fashion; mutually trans monodentate units complete hexacoordination each 1. Similar NCS-bibridging chain is present 2 bidentate (N,N) Schiff base chelator (pfan) cis orientation. chains further engaged intermolecular hydrogen bonding (N–H⋯S) between coordinated along aromatic π–π stacking moieties constrain to lie bc-plane, which via C–H⋯π interactions. In participate kinds Supramers display intraligand ( π – * ) fluorescence 3 phosphorescence glassy solutions (MeOH at 77 K).