We report the synthesis and characterization of two symmetric homo-dimetallic lanthanide complexes based on methyl-substituted 8-hydroxyquinoline(HMeQ).The aryloxo-bridged core gives rise to weak magnetic coupling bet...We report the synthesis and characterization of two symmetric homo-dimetallic lanthanide complexes based on methyl-substituted 8-hydroxyquinoline(HMeQ).The aryloxo-bridged core gives rise to weak magnetic coupling between pairs of ErⅢand YbⅢions,as revealed by magnetic and EPR spectroscopy studies.EPR measurements of magnetically dilute species,coupled with CASSCF-SO calculations,allows modelling of the EPR spectra of the exchange coupled species and the magnetic data simultaneously.This work adds to the database of exchange coupled{Ln}_(2)molecules which have been thoroughly characterised by EPR spectroscopy and modelled using an S_(eff)=1/2 approach to describe the interaction of ground Kramers states,and highlights the differences between centro-symmetric and asymmetric dimetallics.展开更多
基金The University of Manchester and EPSRC EPR National Research Facility(NS/A000055/1)the EPR spectrometers and SQUID magnetometer,and the EPSRC for funding an X-ray diffractometer(grant number EP/K039547/1).+3 种基金The University of Manchester for a Presidential Fellowship,The Royal Society for a University Research Fellowship,and the European Research Council for a Starting Grant(ERC-2019-STG-851504)R.E.P.W.thanks the EPSRC for an Established Career Fellowship(EP/R011079/1)the European Research Council for an Advanced Grant(ERC-2017-ADG-786734)the European Research Council(ERC)under the European Union’s Horizon 2020 research and innovation programme(grant agreements no.786734 and 851504).
文摘We report the synthesis and characterization of two symmetric homo-dimetallic lanthanide complexes based on methyl-substituted 8-hydroxyquinoline(HMeQ).The aryloxo-bridged core gives rise to weak magnetic coupling between pairs of ErⅢand YbⅢions,as revealed by magnetic and EPR spectroscopy studies.EPR measurements of magnetically dilute species,coupled with CASSCF-SO calculations,allows modelling of the EPR spectra of the exchange coupled species and the magnetic data simultaneously.This work adds to the database of exchange coupled{Ln}_(2)molecules which have been thoroughly characterised by EPR spectroscopy and modelled using an S_(eff)=1/2 approach to describe the interaction of ground Kramers states,and highlights the differences between centro-symmetric and asymmetric dimetallics.
