The Ground State of Multispin Systems Based on Verdazyl and Nitrene Radicals: An EPR and Quantum-Chemical Study
| Parent link: | The Journal of Physical Chemistry A.— .— Washington: ACS Publications Vol. 129, iss. 7.— 2025.— P. 1808-1816 |
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| অন্যান্য লেখক: | , , , , , , , |
| সংক্ষিপ্ত: | Title screen In this study, low-temperature EPR spectroscopy and quantum-chemical techniques were employed to investigate multispin systems─1,5-diphenyl-3-(3-nitrenophenyl)-6-oxoverdazyl and 1,5-diphenyl-3-(4-nitrenophenyl)-6-oxoverdazyl─that contain a nitrene center at either a meta- or para-position, respectively. Ground states and magnetic zero-field splitting (ZFS) parameters of these multispin systems were determined by experimental and computational methods. The results indicated that the high-spin quartet state is a ground state, and the quartet–doublet energy gap is close to 10 kcal/mol for the para-position of the nitrene group, with ZFS parameters D = 0.292 cm–1 and E/D = 0.002 cm–1. In contrast, for the meta-position, the low-spin doublet state is favored with an energy gap of 1 kcal/mol. The observed difference in the ground states could be qualitatively explained by an analysis of the spin density distribution and by delocalization of the unpaired π-electron of the nitrene center. Overall, this study provides valuable insights into the electronic structures and magnetic parameters of such multispin systems Текстовый файл AM_Agreement |
| ভাষা: | ইংরেজি |
| প্রকাশিত: |
2025
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| বিষয়গুলি: | |
| অনলাইন ব্যবহার করুন: | https://doi.org/10.1021/acs.jpca.4c06823 |
| বিন্যাস: | বৈদ্যুতিক গ্রন্থের অধ্যায় |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=679747 |
| সংক্ষিপ্ত: | Title screen In this study, low-temperature EPR spectroscopy and quantum-chemical techniques were employed to investigate multispin systems─1,5-diphenyl-3-(3-nitrenophenyl)-6-oxoverdazyl and 1,5-diphenyl-3-(4-nitrenophenyl)-6-oxoverdazyl─that contain a nitrene center at either a meta- or para-position, respectively. Ground states and magnetic zero-field splitting (ZFS) parameters of these multispin systems were determined by experimental and computational methods. The results indicated that the high-spin quartet state is a ground state, and the quartet–doublet energy gap is close to 10 kcal/mol for the para-position of the nitrene group, with ZFS parameters D = 0.292 cm–1 and E/D = 0.002 cm–1. In contrast, for the meta-position, the low-spin doublet state is favored with an energy gap of 1 kcal/mol. The observed difference in the ground states could be qualitatively explained by an analysis of the spin density distribution and by delocalization of the unpaired π-electron of the nitrene center. Overall, this study provides valuable insights into the electronic structures and magnetic parameters of such multispin systems Текстовый файл AM_Agreement |
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| ডিওআই: | 10.1021/acs.jpca.4c06823 |