Photoswitching of the antiferromagnetic coupling in an oxamato-based dicopper(II) anthracenophane.
نویسندگان
چکیده
Thermally reversible photomagnetic (ON/OFF) switching behavior has been observed in a dinuclear oxamatocopper(II) anthracenophane upon UV light irradiation and heating; the two Cu(II) ions (S(Cu) = 1/2) that are antiferromagnetically coupled in the dicopper(II) metallacyclic precursor (ON state) become uncoupled in the corresponding [4+4] photocycloaddition product (OFF state), as substantiated from both experimental and theoretical studies.
منابع مشابه
Redox switching of the antiferromagnetic coupling in permethylated dicopper(II) paracyclophanes.
A unique magnetic electroswitching behavior has been observed in an oxamato-based permethylated dicopper(II) paracyclophane; upon reversible one-electron oxidation of the double tetramethyl-substituted p-phenylenediamidate bridging skeleton, the spin alignment of the two Cu(II) ions (S(Cu) = ½) changes from antiparallel (OFF) to parallel (ON) in the resulting dicopper(II) π-radical cation species.
متن کاملDoubly phenoxo-hydroxo-bridged dicopper(II) complexes: individual contributions of the bridges to antiferromagnetic coupling based on two related biomimetic models for catechol oxidases.
This paper describes the synthesis, structure and spectroscopic and magnetic properties of two (μ-phenoxo)(μ-hydroxo)dicopper(II) complexes (1 and 2) which contain similar N,O-donor atoms but with distinct coordination arrangements around the Cu(II) centers. Structural and magnetic studies of 1 and 2 allowed us to evaluate, for the first time, the individual contributions of the {Cu(μ-phenoxo)C...
متن کاملAntiferromagnetic Coupling in a (/i-Hydroxo)(/x-pyrazolato)dicopper(II) Complex. Synthesis, Crystal Structure, Magnetic Properties, and Theoretical Studies
Binuclear Copper(II) Complex, Super-Exchange Interactions, Antiferromagnetic Coupling Preparation, crystal structure and magnetic properties of a 3,5-dimethylpyrazolate bridged binuclear copper(II) complex [Cu2(L')(3,5 prz)] (L1 = l,3-Bis(2-hydroxy-l-napthylideneamino)propan-2-ol) (1) are reported. Variable-temperature magnetic susceptibility measure ments for a powdered sample of the complex ...
متن کاملThe Reason of the Significant Differences in Antiferromagnetic Interactions between Homologous -Acetato-Bridged Dicopper(II) Complexes: A Theoretical Study
The influence of the overlap interactions between the bridging ligands and the metal d orbitals on the super-exchange coupling constant has been studied by ab-initio Restricted Hartree-Fock molecular orbital calculations. The interaction between the magnetic d orbitals and the HOMOs of the acetate oxygens has been investigated in homologous -acetato-bridged dicopper(II) complexes which have sig...
متن کاملMagnetic Super-Exchange Mechanism and Crystal Structure of a Binuclear ÿ-Acetato-Bridged Copper(II) Complex of Pentadentate Binucleating Ligand. An Influence of Overlap Interactions to Magnetic Properties
Dinuclear Copper(II) Complex, Antiferromagnetic Coupling, Overlap Interaction [Cu2(L)(O2CMe)]ÿ/2H2O (L = 1,3-bis (2-hydroxy-5-chlorosalicylideneamino)propan-2-ol) was synthesized and its crystal structure determined. (C19H16N2O5Cl2Cu2)ÿ/2H2O,monoclinic, space group P 21/c, a = 20.660(10), b = 9.618(2), c = 21.810(10) Å, ÿ = 109.3(8)ÿ, V = 4090(2) Å, Z = 8. The crystal contains two independent d...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Chemical communications
دوره 47 39 شماره
صفحات -
تاریخ انتشار 2011