摘要:

Chemical synthetic methodologies are frequently employed to fabricate ceramic materials. To assist in determining methods for control over the final properties of ceramic materials, we have begun an investigation of the basic chemistry of solgel precursor solutions for lead zirconate titanate (PZT) thin films. The reactions between “M(OCHMe2)4” (M = Ti, Zr) and acetic acid were monitored by1H,13C,17O NMR, and X-ray crystallography. The results of this investigation, the complexes generated, (Ti6(OCHMe2)12(OAc)4O41Ti6(OCHMe2)8(OAc)8O42), and the types of films produced are reported. The synthesis of novel Group (IV) metal alkoxide complexes has been undertaken to generate precursors for ceramic materials with the desired characteristics internalized. In an attempt to reduce hydrolysis, the formation of a variety of metallo-organic compounds containing the sterically bulky adamantan-1-ol ligand (AdamO-H) was studied. It was demonstrated that the OCHMe2ligands of “M(OCHMe2)4” (M = Ti, Zr) were easily replaced with AdamO, forming compounds with the empirical formula “(AdamO)nM(OCHMe2)4-n” (n= 1,2,3, or 4). Spin-cast deposited films of these compounds were not affected by ambient humidity and crystallize upon evaporation of the solvent. Another set of alkoxide ligands which has been investigated is a series of tridentate alkyl alkoxides: 1,1,1-tris(hydroxymethyl)ethane (THME-H3), 1,1,1-tris(hydroxymethyl)propane (THMP-H3), 1,3,5-cyclohexanetriol (CYHT-H3), and 2,2-bis(hydroxymethyl) proprionic acid (BHMP-H3). These ligands have been reacted with Group 4 metal alkoxides to form a variety of precursors that have been identified by spectroscopic and analytical methods. The THME and THMP ligated complexes are of the general formula (THMR)2MA4(OCHMe2)10[R = E, M = Ti, 3, and Zr, 4; R = P, M = Ti, 5 and Zr]. Films of these compounds demonstrate reduced susceptibility to hydrolysis when compared to the standard starting materials Ti(OCHMe2)46, and [Zr(OCHMe2)4. HOCHMe2]27.

ISSN:0260-3594    

DOI:10.1080/02603599408035772

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The activation of metal hydrogen bonds toward alkyne insertion and carbonyl reduction in NO substituted transition metal hydride complexes is discussed. MO theoretical treatment elucidates a genuine nitrosyl effect and enhanced hydricity for this class of compounds. This is traced in NMR based M-H bond ionicity measurements and reactivity studies.

ISSN:0260-3594    

DOI:10.1080/02603599408035773

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0260-3594    

DOI:10.1080/02603599408035771

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor