Issue 10, 2014

Unprecedented bistability domain and interplay between spin crossover and polymorphism in a mononuclear iron(ii) complex

Abstract

A mononuclear complex, [FeL2](BF4)2·xH2O (1LS·xH2O), where L is 4-(3,5-dimethyl-1H-pyrazol-1-yl)-2-(pyridin-2-yl)-6-methylpyrimidine, can be converted into several phases showing different spin crossover regimes. In the first heating 1LS·xH2O loses water molecules and converts into a mixture of two high spin phases, 1A/HS and 1C/HS. Further cycling produces the low spin phase 1A/LS. The transition 1A/LS1A/HS is accompanied by a 130 K wide hysteresis loop (Tc↑ = 490 K, Tc↓ = 360 K). Annealing the complex 1LS·xH2O at 500 K yields a high spin phase 1C/HS. The phase 1C/HS undergoes spin conversion to the corresponding low spin phase 1C/LS on cooling, T1/2 ≈ 320 K. Dehydration of 1LS·xH2O at 370 or 400 K yields a certain low spin phase, 1X/LS, which irreversibly transforms into a high spin phase 1B/HS, which, in turn, reversibly transforms to the low spin phase 1B/LS on cooling, T1/2 ≈ 320 K.

Graphical abstract: Unprecedented bistability domain and interplay between spin crossover and polymorphism in a mononuclear iron(ii) complex

Supplementary files

Article information

Article type
Paper
Submitted
06 Dec 2013
Accepted
20 Dec 2013
First published
23 Dec 2013

Dalton Trans., 2014,43, 3906-3910

Unprecedented bistability domain and interplay between spin crossover and polymorphism in a mononuclear iron(II) complex

M. B. Bushuev, V. A. Daletsky, D. P. Pishchur, Y. V. Gatilov, I. V. Korolkov, E. B. Nikolaenkova and V. P. Krivopalov, Dalton Trans., 2014, 43, 3906 DOI: 10.1039/C3DT53440E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements