Systematic investigation of an array of TCNQ lanthanide complexes: Synthesis, structure and magnetic properties

Juwen Zhang, Pengfei Yan, Guangming Li, Guangfeng Hou, Masayuki Suda, Yasuaki Einaga

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Abstract

An array of TCNQ (TCNQ = 7,7,8,8-tetracyano-p-quinodimethane) lanthanide complexes, namely, [Ln2(TCNQ)4(H2O)10(EtOH)2][2TCNQ]·xH2O [Ln = La (1, x = 5), Pr (2, x = 3)], [Ln2(TCNQ)4(H2O)10][2TCNQ]·yH2O [Ln = Gd (3, y = 6), Dy (4, y = 5)] and [Ln(TCNQ)2(H2O)6][TCNQ]·H2O·MeOH [Ln = Er (5), Lu (6)], have been synthesized by salt-elimination reactions. X-ray crystallographic analysis indicates that 1–6 are discrete ion complexes. Cations of 1–4 adopt a dimer structure, while cations of 5 and 6 display a monomer structure. The magnetic study proposes that an antiferromagnetic interaction between TCNQ radicals exists in 1–6. The depopulation of the Stark levels for 2 and 5 leads to a continuous decrease in χm T when the samples are cooled from 300 K to 2 K. The desolvated 3, namely, 3a exhibits a unique magnetic conversion from the magnetic disordering to the magnetic ordering at 4 K. 4 shows a ferromagnetic coupling between paramagnetic centers.

Original languageEnglish
Pages (from-to)10466-10473
Number of pages8
JournalJournal of the Chemical Society. Dalton Transactions
Issue number47
DOIs
Publication statusPublished - 2009 Nov 24

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Lanthanoid Series Elements
Magnetic properties
Cations
tetracyanoquinodimethane
Dimers
Magnetization
Salts
Monomers
Ions
X rays

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Systematic investigation of an array of TCNQ lanthanide complexes : Synthesis, structure and magnetic properties. / Zhang, Juwen; Yan, Pengfei; Li, Guangming; Hou, Guangfeng; Suda, Masayuki; Einaga, Yasuaki.

In: Journal of the Chemical Society. Dalton Transactions, No. 47, 24.11.2009, p. 10466-10473.

Research output: Contribution to journalArticle

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