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Üngör, Ökten; Igimbayeva, Dilyara; Dragulescu-Andrasi, Alina; Yergeshbayeva, Sandugash; Delgado, Teresa; Greer, Samuel M.; Donalson, Gabrielle; Jo, Minyoung; Erkasov, Rakhmetulla; Shatruk, Michael
Magnetochemistry, 10/2021, Volume: 7, Issue: 10Journal Article
Mononuclear heteroleptic complexes Fe(tpma)(bimz)(ClO4)2 (1a), Fe(tpma)(bimz)(BF4)2 (1b), Fe(bpte)(bimz)(ClO4)2 (2a), and Fe(bpte)(bimz)(BF4)2 (2b) (tpma = tris(2-pyridylmethyl)amine, bpte = S,S′-bis(2-pyridylmethyl)-1,2-thioethane, bimz = 2,2′-biimidazoline) were prepared by reacting the corresponding Fe(II) salts with stoichiometric amounts of the ligands. All complexes exhibit temperature-induced spin crossover (SCO), but the SCO temperature is substantially lower for complexes 1a and 1b as compared to 2a and 2b, indicating the stronger ligand field afforded by the N2S2-coordinating bpte ligand relative to the N4-coordinating tpma. Our findings suggest that ligands with mixed N/S coordination can be employed to discover new SCO complexes and to tune the transition temperature of known SCO compounds by substituting for purely N-coordinating ligands.
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