title: Four 3D "brick-wall"-like metal-organic frameworks with a flexible ligand of (S,S,R,R)-1,2,3,4-cyclopentanetetracarboxylic acid: crystal structures, luminescent and magnetic properties.
abstract: To investigate the conformation of cyclopentanetetracarboxylic acid, four new "brick-wall"-like metal-organic frameworks have been synthesized from hydrothermal reactions with different metal salts, (S,S,R,R)-1,2,3,4-cyclopentanetetracarboxylic acid (H(4)cptc) and auxiliary N-donor ligands, namely, Cu(2)(S,S,R,R-cptc)(bpe)(H(2)O)(2)·2H(2)O (1), Co(2)(S,S,R,R-cptc)(bpe)(0.5)(H(2)O)(2)·2H(2)O (2), Cd(4)(S,S,R,R-cptc)(2)(bpa)(2)(H(2)O)(5)·2H(2)O (3) and Co(2)(S,S,R,R-cptc)(bpy)(0.5)(H(2)O)(2)·2(H(2)O) (4) (bpe = 4-(2-(pyridine-4-yl)vinyl)pyridine, bpa = 4-(2-(pyridine-4-yl)ethyl)pyridine, bpy = 4-(pyridine-4-yl)pyridine). The complexes were further characterized by single-crystal X-ray diffraction, power X-ray diffraction, FT-IR spectra, fluorescent measurements and variable-temperature magnetic susceptibility measurements. The results of the structural investigations show that 1 is a charming (3,3,4)-trinodal architecture, 3 is an interesting trinodal (3,4,5)-connected architecture, and 2 and 4 are isostructural, which are both (4,5)-connected networks. In addition, the magnetic measurements indicate that 2 and 4 show weak antiferromagnetic interactions, and the fluorescent measurement shows the strong solid-state fluorescent emission at room temperature for 3.
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shannxi, PR China.
authors.forename: Lin
authors.initials: L
authors.lastname: Cui
authors.forename: Xin-Jun
authors.initials: XJ
authors.lastname: Luan
authors.forename: Cui-Ping
authors.initials: CP
authors.lastname: Zhang
authors.forename: Yi-Fan
authors.initials: YF
authors.lastname: Kang
authors.forename: Wen-Tao
authors.initials: WT
authors.lastname: Zhang
authors.forename: Yao-Yu
authors.initials: YY
authors.lastname: Wang
authors.forename: Qi-Zhen
authors.initials: QZ
authors.lastname: Shi
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry; D018360:Crystallography, X-Ray; D003517:Cyclopentanes / Q000737:chemistry*; D008024:Ligands; D008280:Magnetics; D008670:Metals / Q000737:chemistry*; D008968:Molecular Conformation; D013237:Stereoisomerism
chemical_list: D056831:Coordination Complexes; D003517:Cyclopentanes; D008024:Ligands; D008670:Metals