A 1D supramolecular compound [dmbbbi]（1） and a 2D cobalt coordination polymer [Co（dmbbbi）（ox）] 2（2） [dmbbbi=1,1-（1,4-butanediyl）bis（5,6-dimethylbenzimidazole）,ox=oxalate],C48H52Co2N8O8,were obtained under hydrothermal conditions by tuning the molar ratio of the reactants.The crystal structure analysis reveals that in compound 1,the adjacent dmbbbi molecules connect with each other via hydrogen bonds to form a 1D supramolecular chain.In compound 2,two crystallographically independent Co2＋ ions show the same six-coordination mode.Each Co2＋ ion is coordinated by four oxygen atoms from two ox anions and two nitrogen atoms from two cis-dmbbbi ligands.The adjacent Co2＋ ions are bridged by ox anions to generate an infinite 1D zigzag chain,which is extended by pairs of dmbbbi ligands to form a 2D honeycomb-like（6,3） network.Moreover,the thermal stability and the electrochemical property of compound 2 were studied.
LIU Lian-li HUANG Jing-jing WANG Xiu-li LIU Guo-cheng YANG Song MU Bao
Four coordination polymers based on two bis-pyridyl-bis-amide ligands and three aromatic dicarboxylates with different substituent groups, namely, [Co（3-bpcb）x.5（NPH）（H20）]＂ 4H20 （1）, [Co（3-bpcb）（NIPH）] （2）, [Co（3-bpcb）0.5（5-H2AIP）]＂ 2H20 （3）, [Co（3-bpcd）0.5（5-H2AIP）（H20）]＂ 2H20 （4） [3-bpcb = N,N＇-bis（3-pyridinecarboxamide）-l,4-benzene, 3-bpcd = N,N＇-bis（3- pyridine）cyclohexane-l,4-dicarboxamide, H2NPH = 3-nitrophthalic acid, H2NIPH = 5-nitroisophthalic acid, 5-HaAIP = 5-aminoisophthalic acid] have been synthetized under hydrothermal conditions. Complex 1 displays a one dimensional （1D） chain based on the binuclear [Co2（NPH）2] units and 3-bpeb ligands, which is extended into a three dimensional （3D） supra- molecular framework through hydrogen bonding and n-n stacking interactions. In complex 2, the （3,5）-connected two dimen- sional （2D） layers are constructed from 1D Co-NIPH chains and bidentate-bridging 3-bpeb ligands. Complex 3 is a 2D double layer based on Co-5-H2AIP 2D layers and 3-bpeb pillars. Complex 4 also displays a 2D network, which is constructed from the Co-5-H2AIP 1D double chains and 3-bpcd ligands. Finally, complexes 2--4 are extended into 3D supramolecular frame- works by hydrogen bonding or n-re stacking interactions. The substituent groups of dicarboxylates play an important role in the assembly and structures of the title complexes. In addition, the fluorescent properties of complexes 1-4 and the electrochemi- cal behaviors of 3 and 4 at room temperature have been investigated.
WANG XiuLiMU BaoLIN HongYanYANG SongLIU GuoChengTIAN AiXiangZHANG JuWen
