Supramolecular Design of Coordination Complexes of Zn(Ⅱ) and Vapor Adsorption for MeOH†

doi:10.7503/cjcu20150842

Abstract

Abstract:

By employing the N'-(2,4-dihydroxybenzylidene)-isonicotinohydrazide ligand to assemble with zinc ions in different solvents, the two metal-organic frameworks(MOFs) 1 and 2 were obtained, namely[(dhbi)₂Zn₂·8H₂O]_n(1) was obtained from the ligand assemble with Zn(ClO₄)₂·6H₂O, {[(dhbi)₂(H₂O)₂Zn₂]·4DMF]}_n(2) was obtained from the ligand assemble with Zn(NO₃)₂·6H₂O using diffusion technology of saturated vapor. Single crystal diffraction was used to characterize their structures. Thermogravimetric analysis(TG-DTA) and powder X-ray diffraction(PXRD) were used to measure their thermal stability and purity. The results of vapor adsorption for MeOH indicate that complex 1 is a kind of satisfactory microporous material, further the complex 1 shows 38.1% void volume, and the complex 2 shows 5.5% void volume according to PLATON calculations.

Key words: N'-(2,4-Dihydroxybenzylidene)-isonicotinohydrazide, Complex of Zn(Ⅱ), Metal-organic frameworks(MOFs), Crystal structure, Methanol, Adsorption

CLC Number:

O614
O647.3

TrendMD:

WU Juan, ZHAO Bowen, HUANG Chao, CHEN Dongmei, ZHU Bixue. Supramolecular Design of Coordination Complexes of Zn(Ⅱ) and Vapor Adsorption for MeOH^†[J]. Chem. J. Chinese Universities, 2016, 37(6): 1069.

Figures/Tables 5

Fig.1 Asymmetric units of complex 1(A), view of the 2D sql net(B) and space-filling diagram(C), involving the O—H…N#1 and N—H…O#2 hydrogen bonds interactions between 2D layers(D) and packed layers of complex 1 viewed slightly obliquely to the c-axis(E)Symmetry codes:(A) Zn1…Zn1a, a: 3/2-x, -1/2+y, 3/2-z; (B) #1: 3/2-x, 1/2+y, 1/2-z; #2: 3/2-x, -1/2+y, 1/2-z.

Fig.2 Asymmetric units of complex 2(A), view of the 2D sql net(B), the hydrogen bonds interactions between H2O with DMF(C), packed layers of complex 2 viewed along the b-axis involving the O—H…N#3 hydrogen bonds interactions between 2D layers(D), 1D open channels along the c-axis(E) and space-filling model of DMF molecules showing 1D open channels along the c-axis(F)Symmetry codes: (A) Zn1…Zn1a, a: -1/2-x, -1/2+y, 1/2-z; (B) #3: 1/2-x,-1/2+y,1/2-z.

Fig.3 TG-DTA curves of complexes 1(A) and 2(B)

Fig.4 PXRD patterns of simulated(a) and as-synthesized(b) complexes 1(A) and 2(B)

Fig.5 Gas adsorption(a) or desorption(b) isotherms of complexes 1(A) and 2(B) for MeOH

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