Mahapatra, S. ; Mukherjee, R. N. (1993) Singlet ⇋ quintet transition in a six-coordinate iron(II) complex of a tridentate bis(pyrazolyl)pyridine ligand Polyhedron, 12 (13). pp. 1603-1606. ISSN 0277-5387
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02775...
Related URL: http://dx.doi.org/10.1016/S0277-5387(00)87069-2
Abstract
The bis(ligand)iron(II) complex [Fe(L1)2](ClO4)2·H2O (1) [L1 = 2,6-bis-(pyrazol-1-ylmethyl)pyridine] displays in the solid-state anomalous magnetic properties which are associated with a temperature-induced singlet (1A1) ⇋ quintet (5T2) transition. Mossbauer spectral data confirm this and reveal separate contributions from the singlet and quintet species with a strong temperature dependence of their relative intensities. Variable-temperature magnetic and Mossbauer studies establish that [Fe(L2)2](ClO4)2·2H2O (2) [L2 = 2-(3,5-dimethylpyrazol-1-ylmethyl)-6-(pyrazol-1-ylmethyl)pyridine] and [Fe(L3)2](ClO4)2·2H2O (3) [L3 = 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine] are purely high-spin species. For 1 three d-d transitions originating from the quintet and singlet state have been identified.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 25857 |
| Deposited On: | 04 Dec 2010 11:29 |
| Last Modified: | 08 Jun 2011 06:31 |
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