Geometry and Spin Change at the Heart of a Cobalt(II) Complex: A Special Case of Solvatomorphism

作者：Cibian Mihaela; Hanan Garry S^*

来源：Chemistry - A European Journal, 2015, 21(26): 9474-9481.

DOI：10.1002/chem.201500852

• cobalt
• coordination chemistry
• N ligands
• solvatomorphism
• structure elucidation

Structural analysis and spectroscopic methods revealed a special case of solvatomorphism: hydrogen-bonding-induced geometry and spin change within a same N,O-(bis)chelate of cobalt(II). Solid-state structures are presented for both the tetrahedral and the solvated square-planar forms of the complex. Magnetic-moment measurements and ESR spectroscopy confirmed the high-spin state of the tetrahedral form ((eff)=4.7(B)) and the low-spin state of the square-planar solvatomorph. Specific hydrogen-bonding interactions between the solvent molecules and the complex chelate ring (O1HCHCl(2) (d=2.26 angstrom, D=3.24 angstrom, =173 degrees); O2HCHCl(2) (d=2.22 angstrom, D=3.19 angstrom, =165 degrees)) play a pivotal role in biasing the system toward the low-spin ground state.

• 出版日期2015-6-22