Vijayalakshmi, R. ; Yusuf, S. M. ; Kulshreshtha, S. K. (2004) Study of [FeII(pyim)3]2+ complexes: dynamic spin equilibrium on encapsulation in zeolite Y Journal of Physics and Chemistry of Solids, 65 (5). pp. 975-979. ISSN 0022-3697
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.jpcs.2003.11.019
Abstract
Tris complex of FeII2(2′-pyridyl)imidazole has been encapsulated in the supercages of zeolite Y and characterized by using powder XRD, FTIR, Mössbauer spectroscopy, variable temperature magnetization and MAS NMR techniques and results have been compared with those obtained for this complex with ClO4− and SO42− as anions. At room temperature, the [Fe(pyim)3](ClO4)2 complex exhibited low spin state, while [FeII(pyim)3]SO4 exhibited the existence of both low and high spin states. The encapsulated [FeII(pyim)3]2+ complex exhibited a broad quadrupole doublet characterized by isomer shift, δ = +0.55 mm/s and quadrupole splitting ΔEq = 1.26 mm/s. The magnetization measurements carried out for the encapsulated [FeII(pyim)3]2+ complex showed a systematic decrease in its values with decreasing temperature down to 75 K with no indication of thermal hysteresis effects. These results suggest the existence of a dynamic spin state equilibrium between the high and low spin states for the encapsulated [FeII(pyim)3]2+ complex with time constant comparable to the characteristic Mössbauer time scale of 57Fe nuclei.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Spin State Equilibrium; FeII Complex; Zeolite; Magnetization; Mössbauer and NMR Spectra |
| ID Code: | 112378 |
| Deposited On: | 01 Dec 2017 11:53 |
| Last Modified: | 01 Dec 2017 11:53 |
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