Photoelectron spectra and bonding in phosphorus compounds
Abstract
Bonding in Phosphorus Compounds1: Reduction Potentials of R2(Y)P-substituted Aromatic π Systems2 and Gasphase Syntheses of 18 Valence Electron Molecules X-P=Y3,4
Abstract An up to date concept of bonding in phosphorus compounds, which has to consider the individual molecular states, their dynamics and reaction channels, is illustrated by representative examples. The reduction potentials of R2(Y)P-substituted π systems to their radical anions, measured under aprotic conditions and discussed by first order perturbation, yields a sequence of increasing acceptor effects ranging from R2P to R3P®. The gasphase syntheses of novel molecules like H3C-P=CH2, Cl-P=O or Cl-P=S, partly by surface reactions, has been optimized by photoelectron spectroscopic real-time analysis. Their radical cation state ionization patterns are assigned by quantum chemical calculations, which allow to rationalize the bonding to the only doubly coordinated P center.
Heat Transfer Characteristic for a New Plate Metal Hydride Reactor
The property of major metal hydride reactors in the world was analyzed and a new plate metal hydride reactor was designed.An experimental facility to test the metal hydride reactor was also designed correspondingly.The effective thermal conductivity of the plate metal hydride reactor was measured by varying the initial metal hydride packing fraction,the kind of filled gas and the pressure of the filled gas,cycle numbers.The test results show that the effective thermal conductivity of the reactor,has exceeded(7.5) W/(m·K) before activation,which is increased greatly.After alloy activation,the effective thermal conductivity of the reactor has a linear change trend with the hydrogen pressure during the interval 0.1~3.5 MPa.The effective thermal conductivity of the reactor just only decreases quickly at the beginning,but becomes stable after several cycles.