Metal-Dilution Effect on Spin Transition Behavior of Solvated/Desolvated Hydrogen-Bonded Cobalt(II)-Organic Frameworks

Overview

Journal ACS Omega

Publisher American Chemical Society

Date 2025 Feb 3

PMID 39895710

Authors

Keisuke Yamato

Takuya Kanetomo

Masaya Enomoto

Affiliations

Soon will be listed here.

Abstract

Terpyridine-based cobalt(II) complex, [Co(HL)] (; HL = 2,2':6',2″-terpyridine-5,5″-diyl dicarboxylic acid), forms a hydrogen-bonded diamond framework with solvent absorption and desorption capabilities. The desolvated form (·desolv) exhibits spin transition (ST) behavior accompanied by thermal hysteresis. To investigate the effect of metal-dilution, an Fe center, which has a low-spin state ( = 0) and coordinates to two terpyridine moieties, was introduced. The resulting complexes, [Co Fe (HL)], where = 0.88 (), 0.55 (), and 0 (), demonstrated a significant influence of metal-dilution on the desolvated forms, but not on the solvated forms. Namely, the spin state is more strongly affected by the presence of solvent than by metal-dilution. However, in the absence of solvent, the Fe ratio significantly impacts the ST behavior.

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