TY - JOUR
T1 - Microwave synthesis and single-crystal-to-single-crystal transformation of magnesium coordination polymers exhibiting selective gas adsorption and luminescence properties
AU - Liu, Hsin Kuan
AU - Tsao, Tai Hsing
AU - Zhang, Ya Ting
AU - Lin, Chia Her
PY - 2009
Y1 - 2009
N2 - A series of new magnesium coordination polymers, [Mg2(BTEC) (H2O)4]·2H2O (1), [Mg 2(BTEC)(H2O)6] (2), and [Mg2(BTEC) (H2O)8] (3) (BTEC = 1,2,4,5-benzenetetracarboxylate anion), were synthesized from magnesium nitrate and 1,2,4,5- benzenetetracarboxylic acid with variable ratios of organic base under microwave-assisted solvothermal reactions at the temperature of 180 (1) or 150°C (2 and 3). The results from crystal structure analysis showed that 1 was a 3D metal-organic framework, 2 a 2D layer, and 3 a 1D ladder structure. In addition, heating 1 at the temperature of 150°C would convert it to 1a which can be a novel single-crystal-to-single-crystal transformation of coordination polymer. Single crystal of 1a has a new 3D structure with formula [Mg 15(BTEC)6(HBTEC)2(H2O) 12]·4H2O, containing unsaturated magnesium sites. Further gas adsorption experiments revealed that 1a undergoes a highly selective sorption of hydrogen instead of nitrogen gases. Photoluminescence studies also displayed that 1a emits extra strong green luminescence around 510 nm under the excitation of ultraviolet light.
AB - A series of new magnesium coordination polymers, [Mg2(BTEC) (H2O)4]·2H2O (1), [Mg 2(BTEC)(H2O)6] (2), and [Mg2(BTEC) (H2O)8] (3) (BTEC = 1,2,4,5-benzenetetracarboxylate anion), were synthesized from magnesium nitrate and 1,2,4,5- benzenetetracarboxylic acid with variable ratios of organic base under microwave-assisted solvothermal reactions at the temperature of 180 (1) or 150°C (2 and 3). The results from crystal structure analysis showed that 1 was a 3D metal-organic framework, 2 a 2D layer, and 3 a 1D ladder structure. In addition, heating 1 at the temperature of 150°C would convert it to 1a which can be a novel single-crystal-to-single-crystal transformation of coordination polymer. Single crystal of 1a has a new 3D structure with formula [Mg 15(BTEC)6(HBTEC)2(H2O) 12]·4H2O, containing unsaturated magnesium sites. Further gas adsorption experiments revealed that 1a undergoes a highly selective sorption of hydrogen instead of nitrogen gases. Photoluminescence studies also displayed that 1a emits extra strong green luminescence around 510 nm under the excitation of ultraviolet light.
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U2 - 10.1039/b819559e
DO - 10.1039/b819559e
M3 - Article
AN - SCOPUS:67650476275
SN - 1466-8033
VL - 11
SP - 1462
EP - 1468
JO - CrystEngComm
JF - CrystEngComm
IS - 7
ER -