Carboxylate free μ-oxo bridged ferric wheel with a record exchange coupling. Issue 43 (19th October 2015)

• Record Type: Journal Article
• Authors: Ahmed, Naushad; Upadhyay, Apoorva; Rajeshkumar, Thayalan; Vaidya, Shefali; Schnack, Jürgen; Rajaraman, Gopalan; Shanmugam, Maheswaran
• Is Part Of: Dalton transactions. Volume 44:Issue 43(2015)
• Page Start: 18743
• Page End: 18747
• Publication Date: 2015-10-19
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt02695d
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : An oxo-bridged, carboxylate free 'ferric wheel' was isolated with the molecular formula [FeIII8(μ-O)4 (L 2− )8 ] (1 ). The strength of antiferromagnetic interaction between the Fe(iii ) ions is revealed by magnetic simulation ( J 1 = −26.4 and J 2 = −170 cm −1 ). The exchange value of −170 cm −1 is the largest exchange value known for any homometallic or heterometallic wheels reported to date. Abstract : A novel oxo-bridged, carboxylate free 'ferric wheel' was isolated with the molecular formula [FeIII8(μ-O)4 (L 2− )8 ] (1 ). Magnetic susceptibility measurements suggest that the Fe(iii ) ions are coupled antiferromagnetically and magnetic data modelling yields J 1 = −26.4 cm −1, J 2 = −170 cm −1 which are rationalized by DFT calculation. The exchange value for1 of −170 cm −1 (Fe–O(oxo)–Fe) is the largest exchange value known compared to any homometallic or heterometallic wheel reported to date.