CL : Vol. 37 (2008) , No. 9 p.896

Bent Donor Molecules and Their Charge-transfer Salts with Magnetic Fe^III and Cu^II Ions

1) Department of Chemistry, Graduate School of Science, Osaka Prefecture University

(Received April 18, 2008)

New donor molecules with a bent molecular skeleton, tetrathiafulvalenoquinone(-thioquinone)-1,3-dithiole(-diselenole)methides are synthesized, which are used for the preparation of charge-transfer (CT) salts with magnetic Fe^III and Cu^II ions. The CT salts with FeX₄⁻ (X = Cl and Br) ions have such crystal structures that are composed of alternating layers of the donor molecules and the FeX₄⁻ ions. On the other hand, for the CT salts with Cu^II ions the donor molecules or both the donor molecules and the Cu^II ions are stacked to each other to form one-dimensional channels, where the other Cu^I and/or Cu^II ions are included inside. Depending on the stacking structures of the donor molecules electrical conducting properties are metallic, semiconducting or insulating. The d spins of the Fe^III and Cu^II ions interact by themselves and also with the conducting π electrons of the donor molecules, bringing about ferromagnetic, weak ferromagnetic, or antiferromagnetic orderings.

New donor molecules with a bent molecular skeleton, tetrathiafulvalenoquinone(-thioquinone)-1,3-dithiole(-disele-nole)methides are synthesized, which are used for the preparation of charge-transfer (CT) salts with magnetic Fe^III and Cu^II ions. The CT salts with FeX₄⁻ (X = Cl and Br) ions have such crystal structures that the donor molecules and the FeX₄⁻ ions form layers, respectively, and are alternately stacked to each other. On the other hand, for the CT salts with Cu^II ions the donor molecules or both the donor molecules and the Cu^II ions are stacked to each other to form one-dimensional channels, where the other Cu^I and/or Cu^II ions are included inside. Depending on the stacking structures of the donor molecules electrical conducting properties are metallic, semiconducting or insulating. The d spins of the Fe^III and Cu^II ions interact by themselves and also with the conducting π electrons of the donor molecules, bringing about ferromagnetic, weak ferromagnetic or antiferromagnetic orderings.