Dmitriev A. I. 1, Zhidkov M. V. 1, Dzhabieva Z. M. 1, Shilov G. V. 1, Savinykh T. A. 1, Dmitrieva M. S. 1, Denisov N. N. 1, Dzhabiev T. S. 1
1Federal Research Center for Problems of Chemical Physics and Medical Chemistry, Russian Academy of Sciences, Chernogolovka, Moscow region, Russia
Email: aid@icp.ac.ru
The effect of dehydration on the spin state of Co2+ ions and the exchange interaction between them in a new tetranuclear cobalt(II) cluster Li10[Co4(H2O)2·(α-VW9O34)2]·34H2O is examined. Magnetometric methods are used to demonstrate that the removal of crystallization water leads to a transition from the low-spin state (S=1/2) to the high-spin one (S=3/2) and an intensification of antiferromagnetic exchange. The following key mechanisms of influence of dehydration are identified: a change in geometry of the coordination sphere and a modification of parameters of the ligand field. The obtained results open up prospects for the development of hygrosensitive materials for sensors and spintronics. Keywords: molecular magnets, hydration, dehydration, spin state, cobalt(II), high-spin state, low-spin state, crystal field, magnetometry.
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