Synthesis and Characterization of the Dinuclear η<sup>1</sup> : η<sup>6</sup>-μ<sub>2</sub>-Arylethynyl Ruthenium Complex[(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)(PR<sub>3</sub>)<sub>2</sub>Ru(η<sup>1</sup> : η<sup>6</sup>-μ<sub>2</sub>-C≡CC<sub>6</s・・・. Journal of Organometallic Chemistry. 2001. 625. 133-139