Syntheses, Structures and Properties of Three Coordination Polymers with 3D Network, 2D Lattice, 1D Ladder Structures

Abstract

Three coordination polymers (CPs), [Ni1.5(L)(bipy)2(H2O)3]n(1), [Zn(L)(Hbipy) (H2O)]n⋅2n(H2O) (2) and [Cu(bipy)2(H2O)2]n⋅2n(H2L)⋅ 3nH2O (3) (NaH2L=5‐sulfoisophthalic monosodium salt, bipy=4,4′‐bipyridine) have been synthesized by solvothermal methods. They were characterized by X‐ray single crystal diffraction, elemental and thermogravimetric analyses. Introduction of the auxiliary N‐donor ligand (bipy) can lead to three Ni(II), Zn(II) and Cu(II) CPs with three‐dimensional (3D) 4‐connected network of the point symbol of (75⋅9), one‐dimensional (1D) ladder and two‐dimensional (2D) lattice frameworks, respectively. Compound 1 is racemic, whose topological structure can be divided into left‐handed and right‐handed helices. The fluorescence emission peaks of compounds 1–3 are located at 416 nm, 412 nm and 455 nm, respectively, which may be attributed to the ligand to metal charge transfers. Variable‐temperature magnetic susceptibility measurements can reveal that there are ferromagnetic and antiferromagnetic exchange interactions between the neighboring spins in compounds 1 and 3, respectively, and compound 2 is a diamagnetism system. Compound 1 shows the second‐harmonic generation (SHG) response that is 4 times those of potassium dihydrogen phosphate (KDP).

A Zinc(II) Coordination Polymer Based on a Chain of {Zn2O7} Bitetrahedra Bridged by 3‐Methoxybenzoates

“…Similar behavior namely red shift of ligand emission has been reported in other d 10 systems. [16][17][18][19][20]…”

“…[5][6][7] In the last two decades several carboxylates of Zn(II) or the higher congener Cd(II) have been studied by many research groups. [8][9][10][11][12][13][14][15][16][17][18][19][20] These studies have resulted in the characterization of several zinc coordination polymers of varying dimensionalities (1D or 2D or 3D) which exhibit interesting structures and luminescene properties. [8][9][10][11][12][13][14][15][16][17] The structures of several dinuclear Zn(II) carboxylates with bridging hydroxo ligand are archived in the Cambridge structural database (CSD).…”

“…[8][9][10][11][12][13][14][15][16][17][18][19][20] These studies have resulted in the characterization of several zinc coordination polymers of varying dimensionalities (1D or 2D or 3D) which exhibit interesting structures and luminescene properties. [8][9][10][11][12][13][14][15][16][17] The structures of several dinuclear Zn(II) carboxylates with bridging hydroxo ligand are archived in the Cambridge structural database (CSD). [21] An analysis of more than forty structures retrieved from the CSD (Table S1) reveals that a majority of these compounds are prepared hydrothermally using hydrated zinc(II) salts like zinc acetate, [22][23] zinc nitrate, [24][25] zinc chloride [26][27] etc.…”