Light-Induced Magnetostructural Anomalies in a Polymer Chain Complex of Cu(hfac)(2) with tert-Butylpyrazolylnitroxides

Light-Induced Magnetostructural Anomalies in a Polymer Chain Complex of Cu(hfac)(2) with tert-Butylpyrazolylnitroxides Full article

Journal

Journal of Physical Chemistry A
ISSN: 1089-5639

Output data

Year: 2013, Volume: 117, Number: 30, Pages: 6483-6488 Pages count : 6 DOI: 10.1021/jp403977n

Authors

Drozdyuk Irina Yu. ¹ , Tolstikov Svyatoslav E. ¹ , Tretyakov Evgeny V. ¹ , Veber Sergey L. ¹ , Ovcharenko Victor I. ¹ , Sagdeev Renad Z. ¹ , Bagryanskaya Elena G. ^1,2 , Fedin Matvey V. ¹

Affiliations

1	(Данные Web of science) Int Tomog Ctr SB RAS, Novosibirsk 630090, Russia
2	(Данные Web of science) NN Vorozhtsov Novosibirsk Inst Organ Chem SB RAS, Novosibirsk 630090, Russia

We report the study of light-induced magnetostructural anomalies in a polymer chain complex of Cu(hfac)(2) (hfac = hexafluoroacetylacetonate) with an unusual acyclic tert-butylpyrazolylnitroxide radical (L-tert(Me)) using EPR This complex aCu(hfac)(2)L-tert(Me)]) belongs to the family of thermo- and photoswitchable molecular magnets "breathing crystals". Compared to previously studied breathing crystals with nitronyl nitroxides, [Cu(hfac)(2)L-tert(Me)](n) shows much weaker absorption bands in the visible spectral region and therefore is superior for optical manipulation of the spin states. Illumination with light (lambda approximate to 540 nm) at cryogenic temperatures leads to formation of a metastable weakly coupled spin state, which relaxes to the ground strongly coupled spin state on a time scale of hours. These phenomena are in many aspects similar to the light-induced excited spin state trapping (LIESST) well-known for spin-crossover compounds. Remarkably, the photoinduced spin state in [Cu(hfac)21L(tert)(Me)](n) is metastable at temperatures up to T-LIESST approximate to 60 K, which is a significant improvement compared to that of previously studied breathing crystals with nitronyl nitroxides (T-LIESST approximate to 20 K). We describe LIESST-like behavior observed in [Cu(hfac)(2)L-tert(Me)](n) and discuss possible reasons for the increased stability of the photoinduced spin state.

Drozdyuk I.Y. , Tolstikov S.E. , Tretyakov E.V. , Veber S.L. , Ovcharenko V.I. , Sagdeev R.Z. , Bagryanskaya E.G. , Fedin M.V.
Light-Induced Magnetostructural Anomalies in a Polymer Chain Complex of Cu(hfac)(2) with tert-Butylpyrazolylnitroxides
Journal of Physical Chemistry A. 2013. V.117. N30. P.6483-6488. DOI: 10.1021/jp403977n WOS Scopus РИНЦ

Published online:	Jul 11, 2013
Published print:	Aug 1, 2013

Web of science	WOS:000322807300009
Scopus	2-s2.0-84881175378
Elibrary	20450626
OpenAlex	W2331751562