Syntheses, crystal structures and photoluminescent properties of two novel Ag( i ) coordination polymers with benzoguanamine and pyrazine-carboxylate ligands: From 1D helix to 1D → 2D interdigitation
2011; Royal Society of Chemistry; Volume: 14; Issue: 2 Linguagem: Inglês
10.1039/c1ce06089a
ISSN1466-8033
AutoresDi Sun, Hong-Jun Hao, Fu-Jing Liu, Hai‐Feng Su, Rong‐Bin Huang, Lan‐Sun Zheng,
Tópico(s)Crystal structures of chemical compounds
ResumoTwo novel coordination polymers (CPs) {[Ag(bga)(pzc)]·0.5H2O}n (1) and [Ag2(bga)2(pzdc)(H2O)]n (2) (bga = benzoguanamine, Hpzc = pyrazine-2-carboxylic acid, H2pzdc = pyrazine-2,3-dicarboxylic acid), have been prepared and characterized. Single-crystal X-ray structural analysis reveals that complex 1 is a novel 1D single-strand helical chain constructed from μ2-N, N′-bga and μ1-(η2-N,O)-pzc ligands. Complementary N–H⋯N hydrogen bonds link the alternate left- and right-handed helical chains to form the final racemic 2D supramolecular sheet. Complex 2 is a 1D U-shaped chain with μ1-N-bga and μ3-(η2-N,O), N′, (η2-O′,O′′)-pzdc ligands. Each U-shaped single chain containing [Ag2(bga)2(pzdc)(H2O)] subunits is staggered along the c axis producing large interstices between adjacent bga ligands which accommodates two identical chains from both sides by interdigitation of the dangling bga ligands, producing a 1D → 2D interdigitated supramolecular sheet through complementary N–H⋯N hydrogen bonds. The structural dissimilarity between 1 and 2 is caused by the different auxiliary pyrazine-carboxylate ligands and different coordination modes of bga ligand. The complementary N–H⋯N hydrogen bonds play prominent roles in the formation of the final racemic 2D supramolecular sheet of 1 and 1D → 2D interdigitated sheet of 2. In addition, the thermal stabilities and emissive behaviors of them were also investigated.
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