TY - JOUR
T1 - Photochemical formations of super high-spin molecules consisting of carbenes and metal ions in frozen solutions
AU - Karasawa, Satoru
AU - Koga, Noboru
N1 - Funding Information:
This work was supported by Grant-in-Aids for COE Research “Design and Control of Advanced Molecular Assembly System” (#08CE2005) from the Ministry of Education, Science, Sports and Culture, Japan.
PY - 2001/5/30
Y1 - 2001/5/30
N2 - Diazo-pyridine compounds 2-4 were prepared as new types of spin sources/magnetic couplers. The molecular structures of 2-4 were determined by X-ray analyses. Photolysis of 2-4 in MTHF frozen solution at cryogenic temperature was followed by EPR spectra and magnetic susceptibility measurements on a SQUID magnetometer/susceptometer. The EPR spectra and the field dependence of magnetization (M) after photolysis of 2, 3, and 4 suggested that their photoproducts are quintet, septet, and undecet ground state, respectively. Similarly, the field dependence of M after photolysis of their complexes with Cu(hfac)2 was measured in a frozen solution. A theoretical equation was used to fit the experimental M-H/T data for the Cu(hfac)2 complexes with 1 and 2 to give spin quantum numbers S = 6.4 and 8.2, respectively. On the other hand, after photolysis of Cu(hfac)2 with 3 and 4, M-H plots clearly showed hysteresis loops with ∼ 2 Oe coercive field.
AB - Diazo-pyridine compounds 2-4 were prepared as new types of spin sources/magnetic couplers. The molecular structures of 2-4 were determined by X-ray analyses. Photolysis of 2-4 in MTHF frozen solution at cryogenic temperature was followed by EPR spectra and magnetic susceptibility measurements on a SQUID magnetometer/susceptometer. The EPR spectra and the field dependence of magnetization (M) after photolysis of 2, 3, and 4 suggested that their photoproducts are quintet, septet, and undecet ground state, respectively. Similarly, the field dependence of M after photolysis of their complexes with Cu(hfac)2 was measured in a frozen solution. A theoretical equation was used to fit the experimental M-H/T data for the Cu(hfac)2 complexes with 1 and 2 to give spin quantum numbers S = 6.4 and 8.2, respectively. On the other hand, after photolysis of Cu(hfac)2 with 3 and 4, M-H plots clearly showed hysteresis loops with ∼ 2 Oe coercive field.
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U2 - 10.1016/S0277-5387(01)00624-6
DO - 10.1016/S0277-5387(01)00624-6
M3 - Article
AN - SCOPUS:0035972484
SN - 0277-5387
VL - 20
SP - 1387
EP - 1389
JO - Polyhedron
JF - Polyhedron
IS - 11-14
ER -