Dynamic 13C NMR studies of ligand exchange in linear (d10) silver(I) and gold(I) and square-planar (d8) rhodium(I) homoleptic metal carbonyl cations in superacidic media

Deoxygenating Reduction of CO2 by [Cp*Al]4 to Form a (Al3O2C)2 Cluster Featuring Two Ketene Moieties

Herein we report that the reaction of the low-valent aluminum(I) species [Cp*Al]₄ (Cp* = pentamethylcyclopentadienyl) with CO₂ exhibits complete cleavages of the C═O bonds. The deoxygenating reduction reaction of [Cp*Al]₄ with CO₂ at 120 °C afforded [(Cp*)₃Al₃O₂C(CO)]₂ (1), which featured two stacked (Al₃O₂C)₂ units and two C═C═O ketene moieties. Moreover, the isoelectronic analogues of diimine and isothiocyanate with CO₂ were also investigated, and the reactions of [Cp*Al]₄ with Dipp*-N═C═N-Dipp* and Dipp-C═N═S [Dipp* = 2,6-bis(diphenylmethyl)-4-tert-butylphenyl; Dipp = 2,6-diisopropylphenyl] afforded dialuminylimine (2) and tetrameric [Cp*AlS]₄ (3), respectively.

Physical Methods of Fast Reactions Investigation

This review presents the basic concepts of the methods used for investigation of fast reactions kinetics, such as: flow methods, with particular emphasis on the stopped-flow approach, NMR, ESR, electrochemical methods, with particular emphasis on the time resolved Fourier Transform electrochemical impedance spectroscopy, flash photolysis, and several others. It offers a brief description of fast reactions commonly encountered in chemical systems, providing an insight into the possibilities of performing kinetic investigations of such reaction systems.