Ghosha, Sujit K. ; Salah El Fallahb, M. ; Ribasb, Joan ; Bharadwaja, Parimal K. (2006) Coordination polymers built from Cu(II) and pyrazine-2,3,5,6-tetracarboxylate or pyridine-2,4,6-tricarboxylate: structural and magnetic studies Inorganica Chimica Acta, 359 (2). pp. 468-474. ISSN 0020-1693
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.ica.2005.07.040
Abstract
Room temperature reaction of Cu(NO3)2 · 6H2O and pyrazine-2,3,5,6-tetracarboxylic acid (ptecH4) in the presence of pyridine (py) in water-methanol (1:1) mixture results in the formation of {[Cu2(ptec) · (py)2 · (H2O)3] · 4H2O}n (1). With pyridine-2,4,6-tricarboxylic acid (pytcH3) and Cu(NO3)2 · 6H2O, crystals of {[Cu(pytc)] · ½[Cu(H2O)6] · H2O}n (2) could be obtained hydrothermally at 180 ° C. The structure of 1 consists of 2D polymeric sheets. These sheets are stacked on top of one another due to strong C-H···π interactions forming an overall 3D structure. The structure of 2, on the other hand, consists of twin-chain coordination polymers. The void spaces between two polymeric chains are occupied by [Cu(H2O)6]2+ ions which are H-bonded to the polymeric chains. The variable temperature magnetic measurements for 1 and 2 show weak antiferromagnetic interaction between Cu(II) centers. The EPR spectra of the compounds are consistent with their structures.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | X-ray Crystal Structures; Metal-organic Framework; Hydrothermal Synthesis |
| ID Code: | 78694 |
| Deposited On: | 23 Jan 2012 03:55 |
| Last Modified: | 23 Jan 2012 03:55 |
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