New Zn(II) Coordination Polymers Constructed from Amino-Alcohols and Aromatic Dicarboxylic Acids: Synthesis, Structure, Photocatalytic Properties, and Solid-State Conversion to ZnO

作者：Paraschiv Carmen^*; Cucos Andrei; Shova Sergiu; Madalan Augustin M; Maxim Catalin; Visinescu Diana; Cojocaru Bogdan; Parvulescu Vasile I; Andruh Marius

来源：Crystal Growth & Design, 2015, 15(2): 799-811.

DOI：10.1021/cg501604c

Four new coordination polymers have been obtained solvothermally from the reactions of Zn(NO3)(2)center dot 6H(2)O with 1,2-, 1,3-, or 1,4-benzedicarboxylic acids in the presence of various amino-alcohols: 18[Zn-2(Htea)(2)(1,2-bdc)] (1), 18[Zn(H(3)tris)(1,3-bdc)(CH3OH)] (2), 38[Zn-5(Htea)(2)(1,3-bdc)(3)(H2O)]center dot 2.6H(2)O (3), and 38[Zn-3(H(2)dea)(2)(1,4-bdc)(3)] (4) (H(3)tea = triethanolamine, H(3)tris = tris(hydroxymethyl)aminomethane, H(2)dea = diethanolamine, 1,2-H(2)bdc =1,2-benzenedicarboxylic acid, 1,3-H(2)bdc =1,3-benzenedicarboxylic acid, and 1,4-H(2)bdc =1,4-benzenedicarboxylic acid). Their crystal structures, thermogravimetric analyses, solid-state transformation to ZnO and characterization of the resultant zinc oxide particles are reported. Compounds 1 and 2 show three-dimensional (3D) supramolecular architectures, generated from the interconnection of the zigzag (in 1) and respectively the linear (in 2) chains through hydrogen bonding interactions. The crystal structure of 3 revealed the presence of five different types of zinc atoms that are successively linked through carboxilato or alkoxo bridges in a helicoidal chain running along the crystallographic a axis. Both right-handed (P) and left-handed (M) helices are present in the crystal, and they are alternately interconnected by pairs of isophthalato bridges, resulting in channels of hexagonal shape, filled with water molecules. Compound 4 has a 3D structure in which linear centrosymmetric {Zn-3(H(2)dea)(2)}(6+) nodes are joined by terephthalate bridges. Owing to its porous network, compound 3 was tested in two selective reactions: photooxidation of phenol to hydroquinone and aerobic photooxidative condensation of benzylamine to N-benzylidenebenzylamine.

• 出版日期2015-2