1D Chain Coordination Polymer Research Articles

Synthesis, structure and luminescence of novel 1D chain coordination polymers [Ln(isophth)(Hisophth)(H 2O) 4·4H 2O] n (Ln=Sm, Dy)

In this paper, we place emphasis on the structure and luminescent properties of novel [Ln(isophth)(Hisophth)(H 2O) 4·4H 2O] n (Ln=Sm, Dy; H 2isophth=isophthalic acid) coordination polymers, which was characterized by elementary analysis, IR, UV, and especially the X-rays single-crystal diffraction. The two complexes are an isostructural series which crystallize in the monoclinic system with P2 1 / c space group. The samarium compound, isomorphous with dysprosium one were determined as a one-dimensional (1D) chain-like configuration by one of the two isophthalic acid ligands in bidentate chelated pattern, while the other isophthalic acid ligands only offer a single carboxylic acid group to bond which is abbreviated as ‘Hisophth’. Fluorescence excitation and emission spectra show that the isophthalic acid is suitable for the sensitization on the luminescence of both Sm(III) and Dy(III).

Synthesis, structure, and thermal decomposition of a novel one-dimensional chain complex of manganese(II) with 2,2-diphenic acid and 1,10-phenanthroline

A novel one-dimensional (1D) chain coordination polymer [Mn2(2,2′-dipha)2(phen)]n has been synthesized by hydrothermal reaction, and characterized by elemental analysis, IR spectroscopy, TGA, and X-ray diffraction. Orange crystals crystallized in the monoclinic system, space group C2/c with a = 19.393(7) A, b = 19.183(7) A, c = 19.729(7) A, β = 90.826(6)°, V = 7338(5) A3, Z = 8. In the crystal structure, one manganese atom is six-coordinated with four carboxylate oxygen atoms from one pentadentate 2,2′-dipha ligand and two tetradentate 2,2′-dipha ligands, and with two nitrogen atoms of one phen ligand, giving a slightly distorted octahedral geometry. The other manganese atom is five-coordinated with five oxygen atoms from two tetradentate 2,2′-dipha ligands and two pentadentate 2,2′-dipha ligands and has a trigonal bipyramidal environment. The TGA curve shows that the compound is stable below 310°.

Construction of metal-organic frameworks through coordination and hydrogen bonding interactions: Syntheses, structures and photoluminescent properties of metal complexes with macrocyclic ligand

A macrocyclic ligand L with two diethylenetriamine units linked by two rigid biphenylene spacers was used as building block for construction of metal-organic frameworks. A silver(I) complex with macrocyclic and open-chain mix-type ligands [Ag 2( L)( L′)](ClO 4) 2 ( 1) [ L′=1,6-bis(4-imidazol-1′-ylmethylphenyl)-2,5-diazahexane] was obtained by reaction of L and L′ together with AgClO 4·H 2O. It is interesting that the open-chain tetradentate ligand L′ only served as a bidentate ligand to bridge the Ag 2 L units into an infinite one-dimensional (1D) cationic chain. Neutral 1D chain coordination polymer [Cu 2( L)( μ-SO 4) 2]·3H 2O·3MeOH ( 2) is formed by sulfate bridges between the neighboring Cu 2 L units. When L reacted with nickel(II) sulfate instead of copper(II) sulfate, a monomacrocycle molecular complex [Ni 2( L)(H 2O) 4(SO 4) 2] ( 3) was obtained in which the sulfate anion acts as monodentate ligands rather than as bridges. When Cd(II) salts were used for the reactions with L, another two neutral 1D coordination polymers, [Cd 2( L)( μ-Cl) 2Cl 2]·2H 2O ( 4) and [Cd 2( L)( μ-Br) 2Br 2] ( 5), with the same structure were isolated. All the synthesized complexes exhibit three-dimensional framework structures linked by various hydrogen bonds. The photoluminescent properties of the synthesized complexes were studied in the solid state at room temperature, and the Ag(I) and Cd(II) complexes were found to show strong blue luminescence.

A novel 1D Cd II coordination polymer with 4-sulfobenzoate and 2,2 ′-bipyridine containing an approximate rectangular molecular box unit with blue fluorescent emission

The hydrothermal reaction of cadmium hydroxide with 4-sulfobenzoic acid and 2,2 ′-bipyridine yields 1D coordination polymer [Cd 2(L) 2(2,2 ′-bipy) 2(H 2O) 2] n 1 (where L = 4-sulfobenzoic acid), with blue fluorescent emission in which each [Cd 2(L) 2(2,2 ′-bipy) 2(H 2O) 2] unit (an approximate rectangular molecular box) is linked together by μ 3 carboxylate to result in the formation of 1D chain coordination polymer. Crystal data for 1: triclinic, space group P-1(No.2), a=8.8350(16), b=9.4770(16), c=11.8019(15) A ̊ ; α=99.174(11), β=105.776(13), γ=113.718(15)°; V=829.1(2) A ̊ 3 ; Z=2; R 1=0.0206, wR 2=0.0526 for 2925 independent reflections with I>2 σ( I).