Phosphaalkynes as ligands in organometallic chemistry. Syntheses and 31p NMR spectra of platinum(II), palladium(II) and rhodium(I) complexes of dη5-cyclopentadienyltetracarbonyl-μ-(3,3-dimethyl-1-phosphabutyne)dimolybdenum, [Mo2(CO)4(η-c5H5)2tBuCP)]

Syntheses of the complexes trans-[PtCl₂(PR₃)Mo₂(CO)₄(η⁵-C₅H₅)₂(^tBuCP)], (PR₃=PEt₃, PPr₃, PBu₃, PPh₂Me, PPhMe₂) trans-[PdCl₂(PBu₃)Mo₂(CO)₄(η⁵-C₅H₅)₂(^tBuCP)], and trans[RhCl{(PF₂NMe)₂CO}Mo₂(CO)₄(η⁵-C₅H₅)₂(^tBuCP)] are described and their ³¹P NMR spectra presented and discussed.     

Reaction of a complexed phosphinidene with 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene

The terminal phosphinidene complex PhPW(CO)5 reacts with 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene to give two unexpected multicyclic organophosphorus compounds. One of them results from an initial 1,2-addition, followed by an intramolecular rearrangement. B3LYP/6-31G* calculations on simplified parent systems suggest that the reaction follows a unique concerted reaction pathway. The second, and major, product is a tetraphosphaquadricyclane derivative, which presumably results from an intramolecular [2+2] cycloaddition of an intermediate tetraphosphanorbornadiene complex. Single-crystal X-ray structures are presented for both products.     

Asymptotic Analysis of Pulse Dynamics in Mode-Locked Lasers

Solitons of the power-energy saturation (PES) equation are studied using adiabatic perturbation theory. In the anomalous regime individual soliton pulses are found to be well approximated by solutions of the classical nonlinear Schrödinger (NLS) equation with the key parameters of the soliton changing slowly as they evolve. Evolution equations are found for the pulse amplitude(s), velocity(ies), position(s), and phase(s) using integral relations derived from the PES equation. The results from the integral relations are shown to agree with multi-scale perturbation theory. It is shown that the single soliton case exhibits mode-locking behavior for a wide range of parameters, while the higher states form effective bound states. Using the fact that there is weak overlap between tails of interacting solitons, evolution equations are derived for the relative amplitudes, velocities, positions, and phase differences. Comparisons of interacting soliton behavior between the PES equation and the classical NLS equation are also exhibited.     

Synthesis,reactions and fluxional behaviour of some benzo[c]cinnoline and phenanthridine pentacarbonyl complexes of chromium,molybdenum and tungsten

Complexes of the type M(CO)₅L (L = benzo[c]cinnoline and phenanthridine; M = Cr, Mo, W) have been prepared and the nature of the bonding established by NMR studies.     

A simple organic reaction mediates the crystallization of the inorganic nanocluster [Ga13(mu3-OH)6(mu2-OH)18(H2O)24](NO3)15

We report the single-crystal structure of an inorganic gallium cluster [Ga13(mu3-OH)6(mu2-OH)18(H2O)24](NO3)15.6H2O prepared using a simple organic reaction to drive the formation of the crystalline inorganic cluster.     

19F and 31P NMR characterisation of the phosphaalkene,CF3 P=CF2, intermediate in the alkaline hydrolysis of bis(trifluoromethyl)phospine

The previously postulated phosphaalkene intermediate CF₃ P=CF₂ in the alkaline hydrolyses of (CF₃)₂ PH has been trapped and characterised by its ¹⁹F and ³¹P NMR spectra.