Seminar: Dr. Suzanne Neville - Spin crossover: structure - function properties

Tuesday, 28 March 2017 - 11:00am – Tuesday, 28 March 2017 - 12:00pm  |  Ainsworth 202

Speaker: Dr. Suzanne Neville

Spin crossover (SCO) materials can be converted between two local spin states (high and low spin) with differing magnetic, optical, electrical and structural properties.[1] Iron(II) complexes show a particularly assorted set of SCO behaviours, encompassing gradual, abrupt, hysteretic, and multi-step spin transitions. Materials that display stepwise transitions are particular sought after as they lead to high order data storage possibilities such as ternary and quaternary processing but are comparatively rare in existence. We have generated a structural platform of 2-D framework materials that intrinsically support the structural distortions requisite of multi-stepped SCO. Through tailoring host-host and host-guest interactions in these materials we have produced a diverse range of multi-stepped (two-,[2] three-[3] and four-stepped[4]) and guest-modulated[5] spin transitions (Figure 1). Detailed structure – function studies on these materials have provided important information on the relative importance of weak and strong interactions and structural distortions on lattice cooperativity (i.e., elastic versus frustrated elastic states).

[1] M. A. Halcrow, Spin-Crossover Materials: Properties and Applications, John Wiley & Sons, 2013.

[2] Y. M. Klein, N. F. Sciortino, F. Ragon, C. E. Housecroft, C. J. Kepert, S. M. Neville, Chem. Comm. 2014, 50, 3838-3840.

[3] M. J. Murphy, K. A. Zenere, F. Ragon, P. D. Southon, C. J. Kepert, S. M. Neville, J. Am. Chem. Soc. 2017, 139, 1330-1335.

[4] N. F. Sciortino, K. A. Zenere, M. E. Corrigan, G. J. Halder, G. Chastanet, J.-F. Létard, C. J. Kepert, S. M. Neville, Chem. Sci. 2017, 8, 701-707.

[5] N. F. Sciortino, F. Ragon, K. A. Zenere, P. D. Southon, G. J. Halder, K. W. Chapman, L. Piñeiro-López, J. A. Real, C. J. Kepert, S. M. Neville, Inorg. Chem. 2016, 55, 10490-10498.