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Chemistry Letters, Vol.37, No.9, 896-901, 2008
Bent Donor Molecules and Their Charge-transfer Salts with Magnetic Fe-III and Cu-II Ions
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 pi electrons of the donor molecules, bringing about ferromagnetic. weak ferromagnetic, or antiferromagnetic orderings.