Polyhedron p. 204 - 211 (2016)
Update date:2022-08-10
Topics:
Lv, Lu-Lu
Zhang, Li-Jun
Zhao, Hong
Wu, Ben-Lai
Using V-shaped mixed ligands bis-imidazole and aromatic carboxylic acids, five new coordination polymers namely, {[Ni(B-im)(Br-a)Cl]·H2O}n (1), {[Ni(B-im)(I-a)(H2O)2]·0.5H2O}n (2), [Ni(B-im)(I-a)(H2O)2]n (3), [Ni(B-im)(M-a)(H2O)2]n (4) and {[Mn2(B-im)2(I-a)2]·2H2O}n (5) [B-im = 1,1′-(5-methyl-1,3-phenylene)bis(1H-imidazole), Br-a = 5-bromonicotinic acid, I-a = isophthalic acid and M-a = 5-methylisophthalic acid] were solvothermally synthesized and fully characterized by IR spectra, element analyses, X-ray powder and single-crystal diffractions, and thermogravimetric analyses. Complexes 1 and 2 feature polymeric macrocyclic chain structures containing interesting nanotubular channels, which are constructed by bridging 30-membered macrocyclic [Ni3(B-im)3] subunits with Br-a ligands and by bridging folded 20-membered macrocyclic [Ni2(B-im)2] subunits with I-a ligands, respectively. Isomorphic complexes 3 and 4 represent double-chain structures containing folded 18-membered macrocyclic [Ni2(B-im)(I-a)] subunits and [Ni2(B-im)(M-a)] subunits, respectively. Complex 5 is a 2D porous coordination polymer containing novel chiral four-stranded Mn(II) chains consisting of two (B-im)-bridged aspiral chiral chains and two (I-a)-bridged heterochiral coaxial 21-helical chains. The results of thermal gravimetric analyses suggest that the dehydrated frameworks of 1-5 are stable up to 320 °C. Additionally, the magnetism of complexes 3 and 5 were also investigated.
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Doi:10.1021/jp9901747
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