INTERNATIONAL JOURNAL OF SCIENTIFIC DEVELOPMENT AND RESEARCH International Peer Reviewed & Refereed Journals, Open Access Journal ISSN Approved Journal No: 2455-2631 | Impact factor: 8.15 | ESTD Year: 2016
open access , Peer-reviewed, and Refereed Journals, Impact factor 8.15
Hydrothermal Synthesis and Crystal Structure of 3D Hydrogen Bonded Framework Obtained by Linear Chain: [Ni (pyridine 2,6 dicarboxylic acid)2(K)2]7(H2O)]n, polymer
A new 3D MOFs synthesized hydrothermally by reacting alkali metal salt (KCl) and transition metal salt [Ni(CH3COOH)2].4H2O together with 2,6-pydc in water for 2 days at 170◦C. This coordination network is characterized by IR spectroscopy, thermal analysis and single crystal X-ray analysis. The 3D structure is constructed by [NiK2(2,6-pydc)2(H2O)7]n unit in which water molecules also act as ligand. The typical antisymmetric (1630cm-1) and symmetric (1516cm-1) stretching bands of carboxylate ions are also observed in the IR spectrum. In the TGA curve, first major weight loss (21.6%) observed in the temperature of 180-240◦C which is assigned to release of seven molecules of water. The nickel atom has a slightly elongated axially distorted octahedral coordination. In the crystal structure of this polymer, most appealing point is that K+ ion shows two different coordination numbers 6 and 7. K2 adopts 7 and K1 adopts 6 coordination numbers. The carboxylate group of pyridine-2, 6-dicarboxylic group adopts bridging mode µ-2, oxygen atom of carboxylic group bridges two metal Ni2+ and K+ ions. The presence of water molecules and carboxylic groups makes extensive intermolecular hydrogen bonding. The magnetic measurement of this in the temperature range of 2K-300K shows negative value of Ɵ indicating antiferromagnetic character at very low temperature. The distance between two Ni2+ metal in is too large thus very less magnetic interactions observed.
"Hydrothermal Synthesis and Crystal Structure of 3D Hydrogen Bonded Framework Obtained by Linear Chain: [Ni (pyridine 2,6 dicarboxylic acid)2(K)2]7(H2O)]n, polymer", International Journal of Science & Engineering Development Research (www.ijsdr.org), ISSN:2455-2631, Vol.2, Issue 9, page no.164 - 175, September-2017, Available :http://www.ijsdr.org/papers/IJSDR1709028.pdf
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Publication Details:
Published Paper ID: IJSDR1709028
Registration ID:170768
Published In: Volume 2 Issue 9, September-2017
DOI (Digital Object Identifier):
Page No: 164 - 175
Publisher: IJSDR | www.ijsdr.org
ISSN Number: 2455-2631
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