Zirconium alkoxides heterometallic

The general properties of the significantly covalent behavior of metal alkoxides (both homo- and heterometallic), in spite of the polar character of the M5+—O5- bond, were already dealt with in some detail (6). The effect of steric and inductive factors on the extent of polarization of the M6+—O5- bond as well as the consequent degree of association and volatility can be exemplified by the boiling points (under 1-mm pressure) and the observed degrees of their association (given in parentheses) by the three isomeric butoxides of zirconium Zr(0-n-Bu)4 ( 250°C 3.5) Zr(0-sec-Bu)4 ( 150°C 2.0 Zr(0-/-Bu)4 ( 50°C 1.0). However, the similarities in the molecular association of the neopentyloxides of Ti, Zr, and A1 to the secondary rather than primaiy amy-loxides have been adduced to indicate the higher predominance of steric rather than inductive factors in the above directions. Similarly, the insolubility and... 

Table 4.20 Heterometallic alkoxides of titanium, zirconium, and hafnium...

Table 5.4 Titanium and zirconium-containing oxo-alkoxides (including heterometallic compounds) ...

Kuhlman R., Vaarstra B.A., Streib W.E., Huffman J.C., Caulton K.G. Primary steps in the hydrolyses of two heterometallic alkoxides. Characterization of lithium-titanium and barium-zirconium isopropoxides [LiTiO(0-wo-Pr)3]4 and BaZr4(OH)(O-W0-Pr)i7. Inorg. Chem. 1993 32 ... 

---