| Abstract: Two coordination polymers, {[Co(bib)3](ClO4)2}n (1) and {[Cu3(bix)4.5](ClO4)3}n (2), (bib=1,4-bis(imidazol-1-yl)-butane, bix=1,4-bis(imidazol-1-ylmethyl)benzene) have been hydrothermally synthesized by using Co(ClO4)2·6H2O/Cu(ClO4)·6H2O, 1,4-bis(imidazolyl-1-yl)butane/1,4-bis(imidazolyl-1-yl) benzene and 4,4'-(1,3-phenylenebis(methyleneoxy))dibenzoic acid (H2pmda) as raw materials and structurally characterized by elemental analysis, IR spectrum, fluorescence spectrum, single-crystal and powder X-ray diffraction. Complex 1 crystallizes in trigonal system, space group R3 with a=b=1.393 37(5) nm, c=1.740 54(13) nm, V=2.926 5(3) nm3, Mr=828.59, Dc=1.410 g·cm-3, F(000)=1 293, μ=0.639 mm-1 and Z=3. The final R1=0.061 1 and wR2=0.193 7 for 1 274 observed reflections with I>2σ(I). Complex 2 belongs to trigonal system too, space group P3 with a=b=2.334 41(15) nm, c=0.715 11(9) nm, V=3.374 9(5) nm3, Mr=1 561.28, Dc=1.536 g·cm-3, F(000)=1 602, μ=1.131 mm-1 and Z=2. The final R1=0.043 9 and wR2=0.109 0 for 3 167 observed reflections with I>2σ(I). Structural analyses reveal that complex 1 shows 2D network structure with 36-membered ring and complex 2 possesses 2D network structure with 84-membered ring. The intermolecular hydrogen bonding or π-π stacking interactions extend the complexes 1 and 2 into supramolecular architectures. Furthermore, we also studied the fluorescence properties of the complexes. |
