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N. Sharma, V. Sharma, R. Bohra, S. Mathur, S. Barth:
"Glycol Modified cis-diisopropoxy-bis(N-phenylsalicylideneiminato) zirconium(IV): Syntheses, Characterization and Their Low Temperature Transformation to Nanocrystalline Zirconia";
Journal of Coordination Chemistry, 61 (2008), 14; 2234 - 2245.

Zr(OPr_i)(4)center dot Pr_iOH reacts with N-phenylsalicylideneimine in anhydrous benzene in 1 : 2 molar ratio to afford [Zr{O(C₆H₄)CH=NPh}₂{OPrⁱ}₂] (1). Further reactions of 1 with various glycols yield heteroleptic complexes of the type [Zr{O(C₆H₄)CH=NPh}₂{O-G-O}] [where-G-= (CH₂)₂ (2), (CH₂CHCH₃) (3), (CH₃CHCHCH₃) (4), (CH₂CHC₂H₅) (5), (CH₂)₃ (6), (CH₂CH₂CHCH₃) (7), and (CH₂)₆ (8)]. All new derivatives have been characterized by elemental analyses, FTIR and NMR (¹H and ¹³C{¹H}) studies. FAB mass spectra of 1 and 7 revealed the monomeric nature of these complexes. Complete hydrolyses and low temperature transformations of 1 and 7 using Sol-Gel technique formed tetragonal phase of ZrO₂ at 700 degrees C, whereas transformation of tetragonal to monoclinic phase occurred at 900 degrees C. SEM observations of these samples indicate formation of agglomerates of nanocrystalline zirconia (Scherer analysis).

Glycol modified zirconium(IV)precursors, cis-diisopropoxy-bis(N-phenylsalicylideneiminato)zirconium(IV), Zirconia

http://dx.doi.org/10.1080/00958970801902483