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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/11679

Title: Anionic metal-organic and cationic organic layer alternation in the coordination polymers [{M(BTEC)(OH2)(4)}center dot{C4H12N2}center dot 4H(2)O](n) (M = Co, Ni, and Zn; BTEC=1,2,4,5-benzenetetracarboxylate)
Authors: MURUGAVEL, R
KRISHNAMURTHY, D
SATHIYENDIRAN, M
Keywords: hydrogen-bonded networks
acid pyromellitic acid
ray crystal-structures
dihydrogen 1,2,4,5-benzenetetracarboxylate
hydrothermal synthesis
bridged binuclear
porous solids
complexes
frameworks
design
Issue Date: 2002
Publisher: ROYAL SOC CHEMISTRY
Citation: JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, (1), 34-39
Abstract: New coordination polymers[{M(BTEC)(OH2)(4)vertical bar.vertical barC(4)H(12)N(2)}.4H(2)O](n)(BTEC= 1,2,4,5-benzenetetracarboxylate) (M = Co 1: Ni 2: Zn 3) have been synthesized starting from the respective transition metal salts, 1,2,4,5-benzenetetracarboxylic acid and piperazine hexahydrate. The highly-crystalline compounds, which are insoluble in water as well as common organic solvents. have been characterized in the solid-state with the aid of elemental analysis. IR and diffuse reflectance UV-visible spectroscopy, and TGA/DTA measurements. The molecular structures of all the compounds have been determined in the solid-state by X-ray diffraction studies; all the three compounds are isomorphous and crystallize in centerosymmetric triclinic space group. The molecular structures are made up of extensively hydrogen-bonded alternating layers of anionic {M(BTEC)(OH2)(4)}(n) coordination polymer and piperazinium dications. The extended structure formed in the solid-state due to extensive inter-layer O-H...O and N-H...O hydrogen bonds incorporate four water molecules per unit cell. The water molecules present in the polymeric network can be easily removed at fairly low temperatures. Heating 1 or 2 to approximately 60-70degreesC in a vacuum (0.1 mmHg) for 12 h results in the elimination of three water molecules as evidenced by elemental analysis. Similar results were obtained from the thermogravimetric studies. The dehydration process is accompanied by a colour change in the case of compounds 1 and 2. Exposure of the dehydrated sample to ammonia results in the uptake of three equivalents of ammonia molecules. However. the methane gas adsorption studies carried out on dehydrated sample did not show the presence of a porous structure.
URI: http://dx.doi.org/10.1039/b105687p
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11679
http://hdl.handle.net/10054/11679
ISSN: 1472-7773
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