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Issue 34, 2018
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Layered ferrimagnets constructed from charge-transferred paddlewheel [Ru2] units and TCNQ derivatives: the importance of interlayer translational distance in determining magnetic ground state

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Abstract

A donor (D)/acceptor (A) assembly reaction using the paddlewheel-type diruthenium(II,II) complex [Ru2(3,5-F2PhCO2)4(THF)2] (3,5-F2PhCO2 = 3,5-difluorobenzoate; abbreviated hereafter as [Ru2]) as D and 7,7,8,8-tetracyano-p-quinodimethane derivatives (TCNQRx; 2,5-R-substituted TCNQ) as A in a DCM/TCE or DCE solvent system (DCM = dichloromethane, TCE = 1,1,2,2-tetrachloroethane, DCE = 1,2-dichloroethane) led to the formation of D2A-type two-dimensional layered compounds [{Ru2(3,5-F2PhCO2)4}2{TCNQRx}]·nsolv (Rx = H2 (1), Rx = Me2, (2), and Rx = (OEt)2 (3)). All the compounds had similar two-dimensional fishnet-type structures, where the two [Ru2] units were fully coordinated with the four cyano groups of TCNQRx. The compounds 1–3 were categorized as a one-electron transferred ionic state (1e-I) with D+–A–D formulation (D+[triple bond, length as m-dash][RuII,III2]+; A[triple bond, length as m-dash]TCNQRx˙). This subunit state formally derived a ferrimagnetically ordered state composed of up-spins with S = 1 for [RuII,II2] and S = 3/2 for [RuII,III2]+ and a down-spin of S = 1/2 for TCNQRx˙, with antiferromagnetic superexchange interactions in each layer. Eventually, 1–3 became three-dimensional ferrimagnets with Curie temperatures TC = 93, 93, and 92 K, respectively, owing to the presence of interlayer ferromagnetic interactions. The interlayer translational distances (l2) for the three compounds were 10.56, 10.54, and 10.84 Å, respectively, which agreed with the empirical prediction based on the threshold value of l2 > 10.3 Å for a valid ferromagnetic interaction.

Graphical abstract: Layered ferrimagnets constructed from charge-transferred paddlewheel [Ru2] units and TCNQ derivatives: the importance of interlayer translational distance in determining magnetic ground state

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Publication details

The article was received on 20 Apr 2018, accepted on 19 Jun 2018 and first published on 20 Jun 2018


Article type: Paper
DOI: 10.1039/C8DT01566J
Dalton Trans., 2018,47, 11760-11768

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    Layered ferrimagnets constructed from charge-transferred paddlewheel [Ru2] units and TCNQ derivatives: the importance of interlayer translational distance in determining magnetic ground state

    W. Kosaka, Z. Liu and H. Miyasaka, Dalton Trans., 2018, 47, 11760
    DOI: 10.1039/C8DT01566J

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