title: Six new metal-organic frameworks based on polycarboxylate acids and V-shaped imidazole-based synthon: syntheses, crystal structures, and properties.
abstract: Solvothermal reactions of 4,4'-bis(imidazol-1-yl)diphenyl ether (BIDPE) with deprotonated 5-hydroxy-isophthalic acid (5-OH-H(2)bdc), and benzene-1,3,5-tricarboxylic acid (H(3)btc) in the presence of cadmium(II), zinc(II), cobalt(II), nickel(II), and manganese(II) salts in H(2)O or H(2)O/DMF produced six new complexes, namely, [Cd(BIDPE)(5-OH-bdc)·H(2)O](n) (1), [Co(BIDPE)(5-OH-bdc)·H(2)O](n) (2), [Zn(3)(BIDPE)(3)(5-OH-bdc)(3)·4H(2)O](n) (3), [Ni(BIDPE)(2)(5-OH-bdc)(H(2)O)·3H(2)O](n) (4), {[Mn(2)(BIDPE)(2)(5-OH-bdc)(2)](n) (5), and [Ni(BIDPE)(2)(Hbtc)(H(2)O)](n) (6). These complexes were characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Compounds 1 and 2 reveal the same two-dimensional (2D) sheets with a 32-membered [(Cd/Co)(2)(BIDPE)(2)] metallocyclic ring constructed from BIDPE and 5-OH-H(2)bdc with Cd or Co salts. For compound 3, six identical 2D sheets are polycatenated in parallel to form a rare 2D → 2D framework; it displays ferroelectric behavior with a remnant electric polarization (P(r)) of 0.033 μC/cm(2) and an electric coercive field (E(c)) of 11.15 kV/cm. In compounds 4 and 6, only one carboxyl group coordinated to the Ni atom from 5-OH-H(2)bdc or H(3)btc. Compound 5 exists as binuclear Mn clusters, which are linked by BIDPE and 5-OH-H(2)bdc to generate a 2D sheet and displays weak antiferromagnetic character. In addition, the thermal stabilities and photochemical properties of these new complexes have been studied.
authors.affiliation: State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Hu
authors.forename: Liangfang
authors.initials: L
authors.lastname: Huang
authors.forename: Xiaoqiang
authors.initials: X
authors.lastname: Yao
authors.forename: Ling
authors.initials: L
authors.lastname: Qin
authors.forename: Yizhi
authors.initials: Y
authors.lastname: Li
authors.forename: Zijian
authors.initials: Z
authors.lastname: Guo
authors.forename: Hegen
authors.initials: H
authors.lastname: Zheng
authors.forename: Ziling
authors.initials: Z
authors.lastname: Xue
mesh_terms: D002104:Cadmium / Q000737:chemistry; D002264:Carboxylic Acids / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D018360:Crystallography, X-Ray; D007093:Imidazoles / Q000737:chemistry; D008345:Manganese / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D009532:Nickel / Q000737:chemistry; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010777:Photochemistry; D011108:Polymers / Q000737:chemistry; D013696:Temperature; D015032:Zinc / Q000737:chemistry
chemical_list: D002264:Carboxylic Acids; D007093:Imidazoles; D009942:Organometallic Compounds; D011108:Polymers; D002104:Cadmium; D003035:Cobalt; D008345:Manganese; C029899:imidazole; D009532:Nickel; D015032:Zinc