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Infinite Chains of Quasi‐Planar Hexameric Water Clusters Stabilized in a Metal‐Organic Framework Built from Co II and Pyrazine‐ 2,3,5,6‐tetracarboxylic Acid
Author(s) -
Ghosh Sujit K.,
Bharadwaj Parimal K.
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200500670
Subject(s) - chemistry , pyrazine , monoclinic crystal system , thermogravimetry , crystallography , infrared spectroscopy , pyridine , crystal structure , molecule , aqueous solution , powder diffraction , metal , x ray crystallography , diffraction , inorganic chemistry , stereochemistry , organic chemistry , physics , optics
Pyrazine‐2,3,5,6‐tetracarboxylic acid ( ptc H 4 ) reacts with Co(NO 3 ) 2 · 6H 2 O in 1:2 molar ratio in aqueous pyridine (py) at room temperature to form a coordination polymer with the empirical formula, {[Co 2 ( ptc ) · (py) 2 · 4H 2 O] · 4H 2 O} n , ( 1 ). The structure consists of 2D sheets of metal‐organic frameworks and infinite chains of cyclic water hexamers that join these sheets to form an overall 3D structure. Thermogravimetry, X‐ray powder diffraction and X‐ray structural analysis have been used in addition to infrared spectroscopy and elemental analysis to characterize 1 . Crystal data for 1 : monoclinic space group P 2 1 , a = 7.153(4), b = 17.003(2), c = 11.060(5) Å, β = 107.207(5)°, V = 1284.9(11) Å 3 , Z = 2, R 1 = 0.0340, wR 2 = 0.0875, S = 1.028. This structure demonstrates a new mode of association of water molecules. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)