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

H. Morikawa, Satoru Karasawa, Noboru Koga

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)507-515
Number of pages9
JournalApplied Magnetic Resonance
Volume23
Issue number3-4
DOIs
Publication statusPublished - Jan 1 2003

Fingerprint

pyridines
magnetic properties
copper
electron paramagnetic resonance
irradiation
superhigh frequencies
ethyl alcohol
molecular structure
plots
magnetization
heating
spectroscopy
x rays

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Magnetic properties after irradiation of tetrakis[4-(α-diazobenzyl)pyridine] copper(II) in a frozen solution. / Morikawa, H.; Karasawa, Satoru; Koga, Noboru.

In: Applied Magnetic Resonance, Vol. 23, No. 3-4, 01.01.2003, p. 507-515.

Research output: Contribution to journalArticle

Morikawa, H. ; Karasawa, Satoru ; Koga, Noboru. / Magnetic properties after irradiation of tetrakis[4-(α-diazobenzyl)pyridine] copper(II) in a frozen solution. In: Applied Magnetic Resonance. 2003 ; Vol. 23, No. 3-4. pp. 507-515.
@article{bda002e5c8c54b4997c1e4d313776814,
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",
month = "1",
day = "1",
doi = "10.1007/BF03166638",
language = "English",
volume = "23",
pages = "507--515",
journal = "Applied Magnetic Resonance",
issn = "0937-9347",
publisher = "Springer Wien",
number = "3-4",

}

TY - JOUR

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.

UR - http://www.scopus.com/inward/record.url?scp=0037266150&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037266150&partnerID=8YFLogxK

U2 - 10.1007/BF03166638

DO - 10.1007/BF03166638

M3 - Article

AN - SCOPUS:0037266150

VL - 23

SP - 507

EP - 515

JO - Applied Magnetic Resonance

JF - Applied Magnetic Resonance

SN - 0937-9347

IS - 3-4

ER -