Rhenium 3 fragment

Similar structural modifications using chiral aliphatic chains (citronellyloxy and its hydrogenated analog) were performed, and these yielded complexes with a chiral nematic phase, though when both terminal chains were chiral, mesomorphism was suppressed. The phases typically occurred between 120 and 160 C. Siting the bulky rhenium fragment in one extremity of the molecule resulted in the destabilization of the mesomorphism, but not its suppression. 

In the dimer [Re2Cl8] ", the NVE is 16 if all the Cl are counted as X ligands. Each rhenium fragment must be counted as monoanionic, and can be described in the form ReX4+y . 

A catalyst supported on y-AFO was prepared from Re2Pt(CO)i2l (Fig. 70) and characterized by IR. X-ray photoelectron spectroscopy (XPS), and TPR. The chemi.sorbed cluster was treated with H2 at about 150 C resulting in fragmentation and formation of rhenium subcarbonyls at 400 C the sample was completely decarbonylated. A catalyst prepared from a mixture of Re3(//-H)3(CO)i2l and PtMe2(// -cod)] and treated under equivalent conditions showed the rhenium to... 

An electron impact (El) ion source uses an electron beam, usually generated from a rhenium filament, to ionize gas-phase atoms or molecules. Electrons from the beam (usually 70 eV) knock an electron from a bond of the atoms or molecules creating fragments and molecular ions [366,534,535]. Several factors contribute to the popularity of El ionization in environmental analyses such as stability, ease of operation, simple construction, precise beam intensity control, relatively high efficiency of ionization, and narrow kinetic energy spread of the ions formed. 

Note that in all of the compounds (161, 169, 171, 173, 175) reported in the initial communication in this area, the endo-polyhedral iridium vertex was erroneously assigned as being rhenium whilst the exo-polyhedral Re(CO)3 fragment in complexes 161,169, and 175 was wrongly identified as Ir(CO)3. The assignments herein are correct. 

---