11  Titanium, zirconium and hafnium

Abstract

It is again easier to identify areas of activity than to point towards specific advances, with active research dominated by organometallics with a view to catalytic activity; alkoxides, amides and related compounds that can afford thin films of compounds like TiO 2 ; and TiO 2 itself. Lesser delights include the identification of the TBPY [ZrCl 5 ] 2 anion and the giant titanium polyoxotungstate with four tri-Ti IV -1,2,3-substituted a-Dawson substructures.

[P3Se7]3−: A Phosphorus-Rich Square-Ring Selenophosphate

“…A similar symmetry-related disorder is found in [Mo 2 Cl 8 ] n-. 25 The synthesis of Cs 10 P 8 Se 20 provides further insight into the close relationship between the structure and flux condition (or A:P:Se ratio) and how the low-valent P species in the alkali selenophosphate class can be stabilized. The remarkably rich structural chemistry of the Cs/P/Se system is summarized in Table 1.…”