Stereochemistry for engineering spin crossover: structures and magnetic properties of a homochiral vs. racemic [Fe(N3O2)(CN)2] complex. Issue 15 (19th March 2015)

• Record Type: Journal Article
• Authors: Wang, Qiang; Venneri, Shari; Zarrabi, Niloofar; Wang, Hongfeng; Desplanches, Cédric; Létard, Jean-François; Seda, Takele; Pilkington, Melanie
• Is Part Of: Dalton transactions. Volume 44:Issue 15(2015)
• Page Start: 6711
• Page End: 6714
• Publication Date: 2015-03-19
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt00357a
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The first chiral Fe II complex of an N3 O2 macrocycle comprises of a 1 : 1 mixture of HS and LS states at 250 K and undergoes both a thermal and light induced SCO. Abstract : The Schiff-base condensation of the R, R -(+)-diamine (2a ) with 2, 6-diacetyl pyridine in the presence of Fe II affords the macrocyclic complex [Fe(dpN3 O2 )(CN)2 ] (3a ) (dp = diphenyl) with ligand centred chirality comprising of a 1 : 1 mixture of LS 6- and HS 7-coordinate Fe II centres. Variable temperature magnetic susceptibility and Mössbauer studies reveal that (3a ) undergoes an incomplete thermal SCO transition with a T 1/2 = 250 K as well as a LIESST effect. In contrast its racemic counterpart (3c ) comprises of mostly LS Fe II and exhibits no LIESST properties.