| Autor: |
Bazhenova TA; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia., Kopotkov VA; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia., Korchagin DV; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia., Manakin YV; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia., Zorina LV; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia.; Institute of Solid State Physics, ISSP RAS, Chernogolovka 142432, Russia., Simonov SV; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia.; Institute of Solid State Physics, ISSP RAS, Chernogolovka 142432, Russia., Yakushev IA; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia.; Kurnakov Institute of General and Inorganic Chemistry, IGIC RAS, Moscow 119333, Russia., Mironov VS; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia.; Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics' RAS, Moscow 119333, Russia., Vasiliev AN; Laboratory of Quantum Functional Materials, National University of Science and Technology 'MISiS', Moscow 119049, Russia.; Lomonosov Moscow State University, Moscow 119991, Russia., Maximova OV; Lomonosov Moscow State University, Moscow 119991, Russia., Yagubskii EB; Institute of Problems of Chemical Physics, IPCP RAS, Chernogolovka 142432, Russia. |
| Abstrakt: |
A series of six seven-coordinate pentagonal-bipyramidal (PBP) erbium complexes, with acyclic pentadentate [ N 3 O 2 ] Schiff-base ligands, 2,6-diacetylpyridine bis-(4-methoxybenzoylhydrazone) [H 2 DAPMBH], or 2,6-diacethylpyridine bis(salicylhydrazone) [H 4 DAPS], and various apical ligands in different charge states were synthesized: [Er(DAPMBH)(C 2 H 5 OH)Cl] ( 1 ); [Er(DAPMBH)(H 2 O)Cl]·2C 2 H 5 OH ( 2 ); [Er(DAPMBH)(CH 3 OH)Cl] ( 3 ); [Er(DAPMBH)(CH 3 OH)(N 3 )] ( 4 ); [(Et 3 H)N] + [Er(H 2 DAPS)Cl 2 ] - ( 5 ); and [(Et 3 H)N] + [Y 0 . 95 Er 0 . 05 (H 2 DAPS)Cl 2 ] - ( 6 ). The physicochemical properties, crystal structures, and the DC and AC magnetic properties of 1 - 6 were studied. The AC magnetic measurements revealed that most of Compounds 1 - 6 are field-induced single-molecule magnets, with estimated magnetization energy barriers, U eff ≈ 16-28 K. The experimental study of the magnetic properties was complemented by theoretical analysis based on ab initio and crystal field calculations. An experimental and theoretical study of the magnetism of 1 - 6 shows the subtle impact of the type and charge state of the axial ligands on the SMM properties of these complexes. |
