Slow magnetization dynamics in Co(ii)/Co(iii) triethanolamine/pivalate complexes. Issue 47 (21st November 2018)

• Record Type: Journal Article
• Authors: Sarto, Carolina; Rouzières, Mathieu; Liu, Jun-Liang; Bamberger, Heiko; van Slageren, Joris; Clérac, Rodolphe; Alborés, Pablo
• Is Part Of: Dalton transactions. Volume 47:Issue 47(2018)
• Page Start: 17055
• Page End: 17066
• Publication Date: 2018-11-21
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt04041a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : We report a combined computational and experimental study of SMM properties of two new pivalate cobalt complexes. Abstract : We report the synthesis, structural characterization and a combined computational and experimental study of the magnetic properties of two pivalate cobalt complexes, a mononuclear Co(ii ) one and a tetranuclear Co(ii )3 Co(iii ) mixed valence polynuclear one. The latter shows SMM behaviour revealed under an applied DC field with a thermal barrier of ca . 30 cm −1 competing with direct and Raman relaxation processes. The Orbach thermal barrier can be understood from the doublets energy ladder arising from the anisotropic exchange interaction among ground S eff = 1/2 of each Co(ii ) sites. The strong local zero-field splitting of the S = 3/2 Co(ii ) states affords these well isolated ground Kramers doublets. DC and AC magnetic susceptibility measurements as well as HF-EPR spectra support this interpretation. CASSCF quantum chemical computations have been also performed in order to aid the overall comprehension of the magnetic behaviour in the reported complexes.