Magnetic on–off switching in redox non-innocent ligand bridged binuclear cobalt complexes. Issue 48 (28th November 2018)

• Record Type: Journal Article
• Authors: Wang, Yichen; Li, Jing; Zhang, Li; Chen, Chao; Feng, Rui; Zhao, Yue; Zhang, Yi-Quan; Tan, Gengwen; Song, You; Wang, Xinping
• Is Part Of: Dalton transactions. Volume 47:Issue 48(2018)
• Page Start: 17211
• Page End: 17215
• Publication Date: 2018-11-28
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt04157a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : We synthesized two binuclear cobalt complexes featuring a magnetic on–off switching property based on the redox non-innocent bpym ligand. Abstract : The redox non-innocent ligand 2, 2′-bipyrimidine (bpym) reacted with two molar equivalents of LCo(tol) (L = CH(MeCNAr)2, Ar = 2, 6-iPr2 C6 H3 ) to afford the binuclear Co II complex (LCo)2 (μ-bpym) (1 ), in which the bpym moiety accepts two electrons from the metal centers and in the dianion state. Complex1 readily underwent one-electron oxidation when treated with [Cp2 Fe] + [BPh4 ] − affording the cation salt [(LCo)2 (μ-bpym)][BPh4 ] (2 ) with the bpym moiety in the radical anion state. Meanwhile, complex2 could be converted back to1 with elemental potassium. The magnetic studies revealed that complex2 is a single molecular magnet (SMM) under a small external field, while1 has no SMM activity. This represents a new example of a SMM exhibiting a fully reversible 'on/off' switching ability in anodic and neutral states.