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Garg, Jai Anand
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article
Trans Bis-N-heterocyclic carbene bis-acetylide palladium(II) complexes
Abstract
<p>A series of square planar trans bis-N-heterocyclic carbene palladium(II) bis(acetylide) complexes of the type [( <sup>i</sup>Pr <sub>2</sub>-bimy) <sub>2</sub>Pd(C≡C-R) <sub>2</sub>] (bimy = benzimidazolin-2-ylidene) (R = C <sub>6</sub>H <sub>5</sub>, C <sub>6</sub>H <sub>4</sub>F, C <sub>6</sub>H <sub>4</sub>OMe, SiMe <sub>3</sub>, C <sub>4</sub>H <sub>3</sub>S, C <sub>5</sub>H <sub>4</sub>N, C <sub>6</sub>H <sub>4</sub>C≡CC <sub>6</sub>H <sub>5</sub> and 1-pyrene) were prepared by the addition of the corresponding lithium acetylides to the starting ( <sup>i</sup>Pr <sub>2</sub>-bimy) <sub>2</sub>PdBr <sub>2</sub> complex in good to modest yields. The molecular structures of ( <sup>i</sup>Pr <sub>2</sub>-bimy) <sub>2</sub>Pd(C≡C-C <sub>6</sub>H <sub>5</sub>) <sub>2</sub> (1) and [( <sup>i</sup>Pr <sub>2</sub>-bimy) <sub>2</sub>Pd(C≡C-SiMe <sub>3</sub>) <sub>2</sub>] (4) were determined by single-crystal X-ray diffraction studies. UV/vis absorption studies reveal significant spectral changes depending on the nature of the acetylide ligands bound to the palladium center.</p>