Magnetic properties after irradiation of tetrakis[4-(α-diazobenzyl)pyridine] copper(II) in a frozen solution

H. Morikawa; Satoru Karasawa; Noboru Koga

doi:10.1007/BF03166638

Magnetic properties after irradiation of tetrakis[4-(α-diazobenzyl)pyridine] copper(II) in a frozen solution

H. Morikawa, Satoru Karasawa, Noboru Koga

Chemo-Pharmaceutical Sciences

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The molecular structure of tetrakis[4-(α-diazobenzyl)pyridine]copper(II) bis(hexafluorophosphate) was revealed by X-ray structure analysis. The magnetic properties after irradiation of a 1:4 mixture of Cu(NO₃)₂ and 4-(α-diazobenzyl)pyridine in frozen ethanol solutions were investigated by electron paramagnetic resonance (EPR) spectrometry and magneto/susceptometry. In a randomly oriented X-band EPR spectrum, new signals appeared in the field range of 0-500 mT at the expense of the signals due to the isolated copper(II) after irradiation. All signal intensities gradually decreased on warming and new signals disappeared over 60 K. The field dependence of difference magnetization M at 2 and 5 K was measured under a condition similar to that for the EPR experiment. Fitting experiments to M vs. H/T plots by use of theoretical equations for two components suggested that a mixture of high-spin species with S = 9/2 and 7/2 in a ratio of 0.18:0.82 formed under a frozen condition.

Original language	English
Pages (from-to)	507-515
Number of pages	9
Journal	Applied Magnetic Resonance
Volume	23
Issue number	3-4
DOIs	https://doi.org/10.1007/BF03166638
Publication status	Published - Jan 1 2003

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

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10.1007/BF03166638

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title = "Magnetic properties after irradiation of tetrakis[4-(α-diazobenzyl)pyridine] copper(II) in a frozen solution",

abstract = "The molecular structure of tetrakis[4-(α-diazobenzyl)pyridine]copper(II) bis(hexafluorophosphate) was revealed by X-ray structure analysis. The magnetic properties after irradiation of a 1:4 mixture of Cu(NO3)2 and 4-(α-diazobenzyl)pyridine in frozen ethanol solutions were investigated by electron paramagnetic resonance (EPR) spectrometry and magneto/susceptometry. In a randomly oriented X-band EPR spectrum, new signals appeared in the field range of 0-500 mT at the expense of the signals due to the isolated copper(II) after irradiation. All signal intensities gradually decreased on warming and new signals disappeared over 60 K. The field dependence of difference magnetization M at 2 and 5 K was measured under a condition similar to that for the EPR experiment. Fitting experiments to M vs. H/T plots by use of theoretical equations for two components suggested that a mixture of high-spin species with S = 9/2 and 7/2 in a ratio of 0.18:0.82 formed under a frozen condition.",

author = "H. Morikawa and Satoru Karasawa and Noboru Koga",

year = "2003",

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T1 - Magnetic properties after irradiation of tetrakis[4-(α-diazobenzyl)pyridine] copper(II) in a frozen solution

AU - Morikawa, H.

AU - Karasawa, Satoru

AU - Koga, Noboru

PY - 2003/1/1

Y1 - 2003/1/1

N2 - The molecular structure of tetrakis[4-(α-diazobenzyl)pyridine]copper(II) bis(hexafluorophosphate) was revealed by X-ray structure analysis. The magnetic properties after irradiation of a 1:4 mixture of Cu(NO3)2 and 4-(α-diazobenzyl)pyridine in frozen ethanol solutions were investigated by electron paramagnetic resonance (EPR) spectrometry and magneto/susceptometry. In a randomly oriented X-band EPR spectrum, new signals appeared in the field range of 0-500 mT at the expense of the signals due to the isolated copper(II) after irradiation. All signal intensities gradually decreased on warming and new signals disappeared over 60 K. The field dependence of difference magnetization M at 2 and 5 K was measured under a condition similar to that for the EPR experiment. Fitting experiments to M vs. H/T plots by use of theoretical equations for two components suggested that a mixture of high-spin species with S = 9/2 and 7/2 in a ratio of 0.18:0.82 formed under a frozen condition.

AB - The molecular structure of tetrakis[4-(α-diazobenzyl)pyridine]copper(II) bis(hexafluorophosphate) was revealed by X-ray structure analysis. The magnetic properties after irradiation of a 1:4 mixture of Cu(NO3)2 and 4-(α-diazobenzyl)pyridine in frozen ethanol solutions were investigated by electron paramagnetic resonance (EPR) spectrometry and magneto/susceptometry. In a randomly oriented X-band EPR spectrum, new signals appeared in the field range of 0-500 mT at the expense of the signals due to the isolated copper(II) after irradiation. All signal intensities gradually decreased on warming and new signals disappeared over 60 K. The field dependence of difference magnetization M at 2 and 5 K was measured under a condition similar to that for the EPR experiment. Fitting experiments to M vs. H/T plots by use of theoretical equations for two components suggested that a mixture of high-spin species with S = 9/2 and 7/2 in a ratio of 0.18:0.82 formed under a frozen condition.

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