With Transition Metal Elements

H Werheit, R Schmechel, V Kueffel, T Lundstrdm. Electronic properties of P-rhombohedral boron interstitially doped with transition metal elements. J Alloys Compos 262-263 379, 1997. 

Various studies on Pt alloy catalysts have been carried out world over. Wieckowski et al. (2003) provides a comprehensive analysis of these studies. The final conclusion that is drawn is as follows. Alloying of Pt with transition metal elements increases the Pt d-band/atom vacancy and decreases the Pt-Pt bond distance. The extent of the change depends upon the electronegativity of the transition element. X-ray absorption... 

A variety of routes is available for the preparation of metal-thionitrosyl complexes. The most common of these are (a) reaction of nitride complexes with a sulfur source, e.g., elemental sulfur, propylene sulfide or sulfur halides, (b) reaction of (NSC1)3 with transition-metal complexes, and (c) reaction of [SN]" salts with transition-metal complexes. An example of each of these approaches is given in Eq. 7.1,... 

Attempts to classify carbides according to structure or bond type meet the same difficulties as were encountered with hydrides (p. 64) and borides (p. 145) and for the same reasons. The general trends in properties of the three groups of compounds are, however, broadly similar, being most polar (ionic) for the electropositive metals, most covalent (molecular) for the electronegative non-metals and somewhat complex (interstitial) for the elements in the centre of the d block. There are also several elements with poorly characterized, unstable, or non-existent carbides, namely the later transition elements (Groups 11 and 12), the platinum metals, and the post transition-metal elements in Group 13. 

C08-0023. Iron and cobalt form compounds that can be viewed as containing cations, but nickel does not. Use the ionization energies in Appendix C to predict which other transition metal elements are unlikely to form stable cations with charges greater than +2. 

---