7422-32-4Relevant academic research and scientific papers
Synthesis, characterization and DFT studies of electron-rich iridium(I) carbonyl complexes of an unsymmetrical phosphine–phosphine monoselenide ligand and their reactivity towards alkyl halides
Guha, Ankur Kanti,Nath, Jayashree,Saikia, Lakshi,Sarmah, Bhaskar Jyoti
, (2020/01/21)
A series of halocarbonyliridium(I) complexes of the type [Ir(CO)(P ~ Se)2X] (1) {where P-Se = 1,2-bis(diphenylphosphinomethaneselenide); X = Cl (1a), Br (1b), I (1c)} have been synthesized by the reaction of [Ir(CO)2X2]? with the ligand Ph2PCH2P(Se)Ph2. The complexes exhibit a single ν (CO) band in the region 1926 cm?1 which is significantly lower in frequency compared to Vaska's complex, trans-[Ir(CO)Cl(PPh3)2] (1965 cm?1), and substantiate the enhanced electron density at the metal centre. The complexes undergo oxidative addition (OA) reactions with electrophiles like CH3I and C2H5I to form Ir(III) alkyl species like [Ir(CO)R(P ~ Se)2IX]; [R = CH3 (2), C2H5 (3)] which exhibit ν (CO) bands in the region of 2070 cm?1. Kinetic measurements for the CH3I oxidative addition with complex 1a indicate a first order reaction. The complexes have been characterized by elemental analyses, IR and NMR spectroscopy. Density functional calculations reveal that the activation barrier for the OA is the lowest with 1a, which is also in tune with the experimental observations.
Ionization and Dissociation Equilibria in Liquid SO2. 12. The Behavior of Tetrahedral Ions
Lichtin, Norman N.,Wasserman, Bernard,Clougherty, Edward,Wasserman, June,Reardon, John F.
, p. 2946 - 2952 (2007/10/02)
Electrolytic conductance of their solutions in liquid sulfur dioxide over a wide range of concentrations was measured for the 21 ionophores, Me4NCl, MeΝClO4, PhMe3NBr, PhMe3NCl, PhMe3NI, Et4NI, Pr4NCl, Pr4NBr, Pr4NI, Bu4NBr, Bu4NI, Bu4NPc, (i-Am)4NBr, (i-Am)4NI, (i-Am)4NB(i-Am)4, (i-Am)3NHBr, Hex4NI, Ph4AsCl, Ph4AsI, Ph4AsPc, and Ph4PPc, at 273.15 K and other temperatures.Limiting equivalent conductances and dissociation constants were determined for these solutes by Shedlovsky's procedure.Utilizing the data of this and other investigations, we calculated thermodynamic quantities for the dissociation equilibria of many of the solutes.Values of Bjerrum's contact distance parameter, a, were calculated from the equilibrium data and compared to sums of estimated ionic radii.Limiting ionic conductances were evaluated by a Fuoss-Coplan division of the limiting equivalent conductance of (i-Am)4NB(i-Am)4.Stokes radii were calculated for the ions employed.The results of the measurements are interpreted in terms of ion-ion and ion-solvent interactions.
