| Abstract
| - We succeeded in the synthesis of a new compound, Gd2([18]crown-6)2(OH)2(CH3CN)2[Ni(dmit)2]2 (dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate). Gd3+ ions (S = 7/2) were introduced into π-spin network of [Ni(dmit)2]- (S = 1/2) complex as a binuclear supramolecular cation, Gd2([18]crown-6)2(OH)2(CH3CN)2, in which two Gd([18]crown-6) units are bridged with two hydroxide ions. From magnetic susceptibility measurements below 120 K, the rapid decrease of χT with the decrease in temperature was observed, which was attributable to the weak antiferromagnetic interactions between Gd···Gd through superexchange interactions. The [Ni(dmit)2]- dimer and monomer (S = 1/2) also contributed to the χT. Above 150 K, the χT curve slowly increased with the increase in temperature, which was due to the antiferromagnetic intradimer interactions of the [Ni(dmit)2]- dimer. As a result, the temperature-dependent magnetic behavior was expressed as the sum of Curie−Weiss magnetism of Gd3+ and the [Ni(dmit)2]- monomer, and that of the thermal excitation model of the [Ni(dmit)2]- dimer.
- Crystal structure and magnetic properties of Gd2([18]crown-6)2(OH)2(CH3CN)2[Ni(dmit)2]2 (dmit2- = 2-thioxo-1,3-dithiole-4,5-dithiolate) are reported. Gd3+ ions (S = 7/2) were introduced into theπ-spin network of [Ni(dmit)2]- (S = 1/2) complex as a binuclearsupramolecular cation, Gd2([18]crown-6)2(OH)2(CH3CN)2, in whichtwo Gd([18]crown-6) units are bridged with two hydroxide ions.The weak antiferromagnetic interactions between Gd···Gd throughhydroxide ions were observed, and [Ni(dmit)2]- formed isolatedmonomers and dimers in the crystal.
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