title: Integration of a semi-rigid proline ligand and 4,4'-bipyridine in the synthesis of homochiral metal-organic frameworks with helices.
abstract: A pair of 3-D homochiral metal-organic frameworks (HMOFs) based on a mixed semi-rigid 5-(2-carboxypyrrolidine-1-carbonyl)isophthalate (PIA) ligand and rigid 4,4'-bipyridine (bipy), [Co3((R)-PIA)2(bipy)3]·6H2O (1-D) and [Co3((S)-PIA)2(bipy)3]·6H2O (1-L) are synthesized and structurally characterized. They are enantiomers and exhibit three-dimensional open frameworks. In each structure, the PIA ligands link the Co centers into homochiral frameworks with large open channels that are occupied by the bipy ligands. Interesting helical chains built from the connectivity between PIA ligands and Co centers are presented. Antiferromagnetic coupling is observed in 1-D. These results demonstrated that the mixed ligand approach is successful for the construction of HMOFs.
authors.affiliation: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, the Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China. zhj@fjirsm.ac.cn.
authors.forename: Zhong-Xuan
authors.initials: ZX
authors.lastname: Xu
authors.forename: Yao
authors.initials: Y
authors.lastname: Kang
authors.forename: Min-Le
authors.initials: ML
authors.lastname: Han
authors.forename: Dong-Sheng
authors.initials: DS
authors.lastname: Li
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008024:Ligands; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010795:Phthalic Acids / Q000138:chemical synthesis / Q000737:chemistry; D011392:Proline / Q000737:chemistry*; D011725:Pyridines / Q000138:chemical synthesis / Q000737:chemistry*; D011759:Pyrrolidines / Q000138:chemical synthesis / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D010795:Phthalic Acids; D011725:Pyridines; D011759:Pyrrolidines; C059768:isophthalate; D003035:Cobalt; D011392:Proline; C034306:4,4'-bipyridyl