Two novel isomorphic coordination polymers [Zn（HPyImDC）H20]（1） and [Co（HPylmDC）H20]（2） were synthesized from 2-（pyridine-3-yl）-lH-4,5-imidazoledicarboxylic acid（H3PylmDC） under hydrothermal conditions. Both the compounds crystallized in P21221 chiral space group, possessing left-hand helical chains and right-hand helical chains. Two types of helical chains connected with each other to form an interesting 2D bilayer structure which extended to a 3D supermolecular structure via the hydrogen-bonding interactions. Topology analysis shows that H3PylmDC ligand and metal center can be regarded as 3-connected T-shaped nodes, thus leading to a （3,3）- connected network with vertex symbol of （82.10）.
A novel 3D ytterbium supramolecular compound, [Yb（HBDDC）（H20）4]·2H2O（1）, was synthesized via 5,5＇-（buta-diyne-1,4-diyl）diisophthalic acid ligand（HaBDDC） under solvothermal conditions. Single-crystal X-ray diffraction analysis reveals that compound 1 crystallizes in triclinic system, PT space group with a=0.71372（14） nm, b=1.0566（2） nm, c=1.7969（4） nm, a=101.01（3）°, β=98.15（3）°, γ=99.17（3）° and V=1.2922（4） nm3. Compound 1 exhi- bits a special infinite 1D chain, which stacks parallel each other in an ABAB sequence, leading to the formation of a 3D supramolecular structure owing to the strong π-π interactions between adjacent phenyl ring groups. Moreover, compound 1 manifests excellent luminescent property.
WANG JingMU LiZHAO TingtingFAN ZhiqiangZHANG Lirong
Two novel 2D coordination polymers, [Co（BPDC）DMSO]·DMSO（1）（BPDC=2,2＇-bipyridyl-4,4＇-dicar- boxylic acid） and [Zn（BPDC）DMF]·DMF（2）, were synthesized from 2,2＇-bipyridyl-4,4＇-dicarboxylic acid ligand （H2BPDC） under solvothermal conditions. Single crystal X-ray diffraction analyses reveal that compound 1 crystal- lizes in orthorhombic system and Pca21 space group with a=1.29628（13） nm, b=1.13721（13） nm, c=1.66457（19） nm, α=90°, β=90°, γ=90°, V=2.4538（5） nm3. Compound 2 crystallizes in monoclinic system and P21/c space group with a=0.9429（6） nm, b=1.4757（10） nm, c=1.5980（9） nm, α=90°, β=114°, γ=90°, V=2.030（2） nm3. Compounds 1 and 2 exhibit two different 3-connected hcb and fes topologies, respectively. The structures of the two compounds both contain interesting characters of double-helical chains（left- and right-handed helical chains）. Additionally, the mag- netic and luminescent properties of the two compounds were studied.
