New thiocyanatocadmates with bidentate N-heterocyclic molecules as the templating agents: synthesis and structural characterization

摘要: The room-temperature reactions between CdX2, NH4SCN and bidentate N-heterocyclic molecules in acidic C2H5OH/H2O solutions yielded five new thiocyanatocadmates, [H2bpp][CdCl2(SCN)2] (bpp = 1,3-bis(4-piperidyl)propane) 1, [H2bpe][CdBr2(SCN)2] (bpe 1,2-bis(4-pyridyl)ethane) 2, [H2(4,4′-dtdpy)][Cd2(SCN)6] (4,4′-dtdpy 4,4′-dithiodipyridine) 3, [H2(4,4′-dtdpy)][CdBr2(SCN)2] 4 [H(2,2′-dtdpy)][Cd(SCN)3] (2,2′-dtdpy 2,2′-dithiodipyridine) 5. It is noteworthy that (i) compound Cd2+ SCN− aggregate together to form two types of ribbons with H2(4,4′-dtdpy)2+ as the templating agent; (ii) 5, 2,2′-dtdpy monoprotonated, anion [Cd(SCN)3]− shows a 2D honeycomb-like layer structure; (iii) compounds 1–4, still act linkers extend inorganic anions into 1D or supramolecular networks via weak hydrogen-bonded interactions piperidyl/pyridyl N atoms acceptors, although they are diprotonated. In ethanol solution, all title emit light upon excitation.