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Ligand-Promoted Solvent-Dependent Ionization And Conformational Equilibria Of Re(Co)3Br[Ch2(S-Tim)2] (Tim = 1-Methylthioimidazolyl). Crystal Structures Of Re(Co)3Br[Ch2(S-Tim)2] And {Re(Co)3(Ch3Cn)[Ch2(S-Tim)2]}(Pf6), Rosalice M. Silva, Brendan J. Liddle, Sergey V. Lindeman, Mark D. Smith, James R. Gardinier Jan 2006

Ligand-Promoted Solvent-Dependent Ionization And Conformational Equilibria Of Re(Co)3Br[Ch2(S-Tim)2] (Tim = 1-Methylthioimidazolyl). Crystal Structures Of Re(Co)3Br[Ch2(S-Tim)2] And {Re(Co)3(Ch3Cn)[Ch2(S-Tim)2]}(Pf6), Rosalice M. Silva, Brendan J. Liddle, Sergey V. Lindeman, Mark D. Smith, James R. Gardinier

Chemistry Faculty Research and Publications

The compounds Re(CO)3Br[CH2(S-tim)2] (1) and {Re(CO)3(CH3CN)[CH2(S-tim)2]}(PF6) (2), where tim is 1-methylthioimidazolyl, were prepared in high yields and characterized both in the solid state and in solution. The solid-state structures show that the ligand acts in a chelating binding mode where the eight-member chelate ring adopts twist-boat conformations in both compounds. A comparison of both solid-state IR data for CO stretching frequencies and the solution-phase voltammetric measurements for the Re1+/2+ couples between 1, 2, …


A Practical Synthesis Of Bridged Diarylacetylenes, Ruchi Shukla, Daniel M. Brody, Sergey V. Lindeman, Rajendra Rathore Jan 2006

A Practical Synthesis Of Bridged Diarylacetylenes, Ruchi Shukla, Daniel M. Brody, Sergey V. Lindeman, Rajendra Rathore

Chemistry Faculty Research and Publications

An efficient and practical synthesis of bridged diarylacetylenes in multigram quantities has been successfully carried out using high-yielding (classical) synthetic methods and readily available starting materials. The structural analysis of the representative bridged diarylacetylenes by X-ray crystallography strongly suggests that conformations, bending of the linear triple bond, and the angle between the mean planes of aromatic rings in various bridged diarylacetylenes are governed by the p−π conjugation among the aromatic rings and the ethereal groups. Furthermore, the synthetic scheme also allows the preparation of (appropriately) bromo-substituted bridged diarylacetylenes which hold potential for their future usage for the preparation of polymeric …