Tunable gas adsorption properties of porous coordination polymers by modification of macrocyclic metallic tectons

• DOI: 10.1039/c5ce01577d
• Publication Date: 2015-11-16T09:02:33Z
• Authors: Xiang Jiang; Kong-Qiu Hu; Hui-Zhong Kou
• Keywords: Coordination polymer

By using the semi-rigid ligand tetrakis[4-(carboxyphenyl)oxamethyl]methane acid (H4TCM) and various macrocyclic metallic tectons, eight new Ni(II) coordination polymers, namely, [(NiL1)2(TCM)]·17H2O (1), [(NiL2)2(TCM)]·17H2O (2), [(NiL3)2(TCM)]·18H2O (3), [(NiL4)2(TCM)]·4DMF·10H2O (4), [(NiL5)2(TCM)]·4DMF·9H2O (5), [(NiL6)2(TCM)]·20H2O (6), [(NiL7)2(TCM)]·18H2O (7), [(NiL8)2(TCM)]·4H2O (8) (L1 = 1,8-dimethyl-1,3,6,8,10,13-hexaaza-cyclotetradecane, L2 1,3,6,9,11,14-hexaaza-tricyclooctadecane, L3 1,3,6,10,12,15-hexaaza-tricycloeicosane, L4 1,3,6,8,11,14-hexaaza-tricyclooctadecane, L5 4-methyl-1,3,6,8,11,14-hexaaza-tricyclooctadecane, L6 1,3,6,8,12,15-hexaaza-tricycloeicosane, L7 11-methyl-1,4,8,10,13,15-hexaaza-tricycloicosane L8 3,10-diisobutyl-1,3,5,8,10,12-hexaaza-cyclotetradecane), were synthesized structurally characterized. Single crystal X-ray analyses reveal that compounds 1–8 exhibit a similar diamondoid (dia) topology network. Regulated by 1–3 feature three-dimensional (3D) framework with 7-fold interpenetration, giving rise to 1D porous channel size of ca. 1 nm. Compounds 4–7 possess 3D network 2D channels (porous 0.5 nm) 4-fold interpenetration. Compound 8 shows dense packing arrangement 2-fold The porosity 1–7 was confirmed N2 gas adsorption measurements at 77 K. Furthermore, due functional groups exposed on surface, activated compound 3 exhibits selective CO2 over N2. results show structure, stability can be tuned modification tectons.