Transition metal coordination polymers based on tetrabromoterephthalic and bis(imidazole) ligands: Syntheses, structures, topological analysis and photoluminescence properties

摘要: Abstract Eight new coordination polymers (CPs), namely, [Zn(1,2-mbix)(tbtpa)]n (1), [Co(1,2-mbix)(tbtpa)]n (2), [CdCl(1,2-mbix)(tbtpa)0.5]n (3), {[Cd(1,2-bix)(tbtpa)]·H2O}n (4), {[Cd0.5(1,2-bix)(tbtpa)0.5]·H2O}n (5), {[Co0.5(1,2-bix)(tbtpa)0.5]·2H2O}n (6), {[Co(1,2-bix)(tbtpa)]·H2O}n (7) and {[Co(1,2-bix)(tbtpa)]·Diox·2H2O}n (8), were synthesized under solvothermal conditions based on mix-ligand strategy (H2tbtpa=tetrabromoterephthalic acid 1,2-mbix=1,2-bis((2-methyl-1H-imidazol-1-yl)methyl)benzene, 1,2-bix=1,2-bis(imidazol-1-ylmethyl)benzene). All of the CPs have been structurally characterized by single-crystal X-ray diffraction analyses further elemental analyses, IR spectroscopy, powder (PXRD), thermogravimetric (TGA). show that 1 2 are isotypics which 2D highly undulated networks with (4,4)-sql topology existence C–H ⋯ Br interactions; for 3, it has a planar network occurrence Cl interactions other than 4 shows 3D 2-fold interpenetrated nets rare 65·8-mok self-catention property. As same case as 2, 5 6 also isostructural layers 44-sql assembled into supramolecular structure through interdigitated stacking fashion C–Br Cph interactions. 7, slightly one dimension channel. While 8 (3,4)-connect jeb point symbol {63}{65·8}. And their structures can be tuned conformations bis(imidazol) ligands solvent mixture. Besides, TGA properties all compounds luminescent 1, 4, discussed in detail.