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Intra- and inter-molecular exchange on symmetrical hydrazine diradical dications and comparison of the magnetic exchange with ET parameters derived from their optical spectra

Teki, Yoshio and Ismagilov, Rustem F. and Nelsen, Stephen F. (1999) Intra- and inter-molecular exchange on symmetrical hydrazine diradical dications and comparison of the magnetic exchange with ET parameters derived from their optical spectra. Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 334 (1). pp. 313-322. ISSN 1542-1406. https://resolver.caltech.edu/CaltechAUTHORS:20130821-160733739

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Abstract

The spin alignment in a charged molecular field is important research issue in the molecular magnetism. In order to clarify the interrelation between spin alignment and the charged molecular field, we have investigated intra- and inter-molecular exchanges on some Hydrazine diradical dictations 1–3 shown in Scheme 1 (see texts) by ESR and magnetic susceptibility measurement. The magnetic behavior of the dication salt 1 has been well analyzed using the alternating linear chain models with J_(intra)/k_B = −106 K, J_(inter_/k_B = −49 K and an alternating parameter α=0.46. The magnetic property of 3 has been also fitted to the alternating chain model with J/k_B = −106 K J_(inter)/k_B = −42 K (α=0.40). On the other hand, 2 gives a robust triplet ground state with larger energy separation from other spin states. The energy separation has been estimated to be larger than 300 cm−1 (J_(intra)/k_B > ±190 K) from the temperature dependence of the ESR signal intensity. These findings indicate that the sign of the intramolecular exchange depends on the linking position (m- or p-) of the hydrazine cation group, i.e. the topology of the π orbital network even in the cationic molecular field. The magneto-optical correlation is also discussed based on the intramolecular electron transfer (ET) parameters.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1080/10587259908023329DOIArticle
http://www.tandfonline.com/doi/abs/10.1080/10587259908023329PublisherArticle
ORCID:
AuthorORCID
Ismagilov, Rustem F.0000-0002-3680-4399
Additional Information:© 1999 Taylor & Francis. This work was financially supported by a Grant-in-Aid for a General Scientific Research (No. 07454191) from the Ministry of Education, Science, Sports, and Culture, Japan and Precursory Research for Embryonic Science and Technology (PEST) from Japan Science and Technology Corporation.
Funders:
Funding AgencyGrant Number
Ministry of Education, Science, Sports, and Culture, Japan07454191)
Japan Science and Technology CorporationUNSPECIFIED
Subject Keywords:stable dication diradical; intramolecular exchange; electron transfer; spin alignment ground-state; spin; crystals
Issue or Number:1
Record Number:CaltechAUTHORS:20130821-160733739
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130821-160733739
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40880
Collection:CaltechAUTHORS
Deposited By: Whitney Barlow
Deposited On:28 Aug 2013 23:23
Last Modified:03 Oct 2019 05:44

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