Issue 74, 2014

A facile route for preparation of monodisperse nanoparticles of one-dimensional Fe(ii)-4-amino-1,2,4-triazole coordination polymers with hysteretic spin-crossover near room temperature

Abstract

Spin-crossover (SCO) occurring in a transition metal complex is the switchable process between two spin states in response to external perturbations such as changes in temperature, pressure or photoexcitation. Such a material has potential applications in switching devices. In this study, we designed a one-dimensional spin-crossover polymer, with a formula of [Fe(NH2-Trz)3](doe)2 where NH2-Trz = 4-amino-1,2,4-triazole and doe = sodium dodecyl sulfonate, and fabricated its monodisperse nanoparticles using a facile precipitation route. The nanoparticles aggregate from plate-shaped nanocrystals and their size dimensions fall in the range of 200–300 nm. The SCO polymer undergoes a thermal reversible spin transition near room temperature which is important for practical applications. The spin transition shows ca. 13 K hysteretic loops and is associated with a color change. The SCO polymer nanoparticles were pressed under ca. 8 MPa static pressure to give a good transparent disc with a thickness of ca. 1 mm; such a disc displays a pink-violet color at ambient temperature and a yellowish color above 45 °C. This SCO material has potential applications in the field of thermochromic devices.

Graphical abstract: A facile route for preparation of monodisperse nanoparticles of one-dimensional Fe(ii)-4-amino-1,2,4-triazole coordination polymers with hysteretic spin-crossover near room temperature

Supplementary files

Article information

Article type
Paper
Submitted
24 Jul 2014
Accepted
22 Aug 2014
First published
22 Aug 2014

RSC Adv., 2014,4, 39126-39131

Author version available

A facile route for preparation of monodisperse nanoparticles of one-dimensional Fe(II)-4-amino-1,2,4-triazole coordination polymers with hysteretic spin-crossover near room temperature

M. Chen, X. Chen, W. Ning and X. Ren, RSC Adv., 2014, 4, 39126 DOI: 10.1039/C4RA07565J

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