The field of heteropolymetallic complexes is of current interest in connection with the structures and roles of polymetallic active sites in biological systems [1], and the design of new molecular materials with magnetic, optical and electrical properties [2,3]. Among various relevant systems, oxamido-bridged polynuclear complexes [2,4] and phenolato-oxygen-bridged macrocyclic complexes [5,6] r...

A series of diverse natural product-like structures have been synthesised by the use of a number of novel transannulation reactions across a cyclononene ring. Transannular cyclisations through oxygen functionality have generated a number of bicyclo[5.3.1]systems containing bridged cyclic ethers and bicyclo[5.2.2]lactones, as well as a tetrahydrofuran-containing bridged analogue of hexacyclinic ...

The intramolecular [3+2] cycloaddition (32CA) of alkene-tethered α-silyloxydiazoalkanes provides variable stereoselectivity in generating bicyclic pyrazolines where the silyloxy group is either syn or anti to the newly formed pyrazoline ring. To elucidate the origin of the stereoselectivity, density functional theory (DFT) calculations were carried out for the energy of each transition state st...

Phase shift versus control voltage for bridged-tee phase modulator {f—7}250 he). work during modulation is not generally serious, since the input reactance of the network decreases to only — j4:Xc/S ohms when R2 becomes zero. Another application of the bridged-tee of figure 3 is suggested by the previously mentioned property of this network of giving constant attenuation with variation in frequ...

Clusters, Vinylidene Ligands. Alkylidyne Ligands Based on the observation that the alkylidyne bridged cluster HFeCo2(CO)4(/<3-C —CH 3) spon­ taneously loses H ; to form the vinylidene bridged cluster FeCo2(CO)y(«3-C—CH :). the intercon­ versions between these types of ligands on mixed trinuclear clusters were investigated. It was found that in all cases clusters of the type HM3(/<3-C -C H 2R) c...

We present a theoretical study of spin-dependent transport through molecular wires bridging ferromagnetic metal nanocontacts. We extend to magnetic systems a recently proposed model that provides a quantitative explanation of the conductance measurements of Reed et al. [1] on Au break-junctions bridged by self-assembled molecular monolayers (SAMs) of 1,4-benzene-dithiolate (BDT) molecules. Base...