Three solvatomorphs of the iron(II) complex of 2,6-di[4-(ethylcarboxy)pyrazol-1-yl]pyridine (bpCOOEtp) of formulas [Fe(bpCOOEtp)](ClO)·1.5MeNO (), [Fe(bpCOOEtp)](ClO)·MeNO (), and [Fe(bpCOOEtp)](ClO)·2MeNO () have been prepared and characterized. They show interesting spin-crossover (SCO) properties ranging from partial to complete thermal spin transitions and a light-induced excited spin-state trapping (LIESST) effect. In solvatomorph , a robust structure is formed with channels that enable the entrance or removal of solvent molecules by vapor diffusion without losing the crystallinity. Thus, solvent-exchanged samples [Fe(bpCOOEtp)](ClO)·MeNO ( ), [Fe(bpCOOEtp)](ClO)·MeCN (), [Fe(bpCOOEtp)](ClO)·0.5MeCO ), and [Fe(bpCOOEtp)](ClO)·MeCOOH () were prepared by vapor diffusion of the solvents in a crystal of the compound previously heated to 400 K in a single-crystal to single-crystal (SCSC) fashion. Interestingly, this causes a change of spin state with a stabilization of the low-spin state in and the high-spin state in . Therefore, the SCO properties of can be tuned in a reversible way by exposure to different solvents.
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| http://dx.doi.org/10.1021/acs.cgd.2c01524 | DOI Listing |
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