Molecular structure 3-diketonate//3-diketones

Fluorinated a-diketones are reduced by baker s yeast in a regioselective fashion giving reduction chiefly at the ketone which is adjacent to the fluorine atoms (equation 70)290. The enantiomer in excess can be selected by manipulation of the rest of the molecular structure. 

In summary, this brief review of the synthesis of Group 2 /3-diketonate compounds shows how sensitive the outcome of the reaction is to the nature of the reaction conditions. As a result, it is often difficult to determine exactly which species have been used in CVD experiments when, for example, the species Ba(dpm)2 has been used and obtained from a commercial source. Indeed, the CVD literature is often misleading, with figures showing schematic diagrams of the molecular structure of monomeric Ba(dpm)2 as the source used for CVD experiments.215... 

It is also worth mentioning here that two compounds containing a Zn Sn coordinate bond have been reported. The first of these is the sole example of a dialkyltin species (see Tin Organometallic Chemistry) stabilized by coordination to zinc-/3-diketonate. It was obtained by reaction of bis[3-dimethylamino)propyl]zinc with bis(dibenzoylmethanato)tin (equation 37) and its molecular structure shows a Zn Sn bond length of 2.634 A. The second compound is... 

Figure 4.42. Molecular structures of commonly used CVD precursor classes. Shown are (a) metal p-diketonate (acetylacetonate, acac) complex to grow a metal oxide film (H2 as the coreactant gas yields a metal film) (b) a heteroleptic (more than one type of ligand bound to the metal) p-diketonate complex to yield a Cu film the ancillary ligand helps prevent oligomerization, enhancing volatility (c) various types of complexes to deposit metallic, oxide, nitride, or oxynitride films (depending on coreactant gas(es) used - respective ligands are p-ketoiminato, p-diketiminato, amidinato, and guanidinato (d) a metal azolato complex commonly used to deposit lanthanide metal thin films.

Molecular structures of some representative bis(P-diketones) ligands are shown in Figure 2.8. 

Figure 2.9 Molecular structures of some representative dendrimer dendritic P-diketones ligands.

Figure 2.16 View of the molecular structure of [Eu(HL )3(CH30H)2]-CH30H-2H20. The non-coordinated methanol molecule and hydrogen atoms were omitted for clarity [40]. (Reprinted from Polyhedron, 28, S. Tanase, M. Viciano-Chumillas, J.M.M. Smits, R. de Gelder and J. Reedijk, Cop-per(II) and lanthanoid(III) complexes of a new fS-diketonate ligand with an appended non-coordinating phenol group, 457 60, 2009, with permission from Elsevier.)...

Figure 2.31 Molecular structure of Eu(F )3 (dmphen)(EtOH)dmphen. (Displacement ellipsoids for non-FI atoms are shown at the 50% probability level and H atoms are represented by circles of arbitrary size) [26b]. (Reprinted from Inorganica Chimica Acta, 360, C.R. De Silva, J.R. Maeyer, R. Wang, GS. Nichol, Z. Zheng, Adducts of europium -diketonates with nitrogen p,p -disubstituted bipyridine and phenanthroline ligands Synthesis, structural characterization, and luminescence studies, 3543-3552, 2007, with permission from Elsevier.)...

Figure 2.36 Molecular structure of [Gd(L )3(H20)]-4H20 co showing 30% ellipsoids with all H atoms and lattice solvent molecules removed [43]. (Reproduced with permission from RC. Andrews, G.B. Deacon, R. Frank, B.H. Fraser, P.C. Junk, et al., Formation of Ho trinuclear clusters and Gd monodimensional polymers induced by ortho and para regioisomers of pyridyl-functionahsed fi-diketones synthesis, structure, and magnetic properties, European Journal of Inorganic Chemistry, 2009, 6, 744-751. Wiley-VCH Verlag GmbH Co. KGaA.)...

Figure 2.50 Molecular structure of [Tb2(L )6(fi -0(CH2)2NHMe2)2] -CtHs. Fluorine atoms and solvate toluene molecule are omitted for clarity [81]. (Reprinted with permission from S.V. Eliseeva, O.V. Kotova et al, Role of the ancillary ligand V,V-dimethylaminoethanol in the sensitization of Eu and luminescence in dimeric P-diketonates, The Journal of Physical Chemistry A, 112, 3614-3626, 2008. 2008 American Chemical Society.)...

Figure 11.18 The molecular structure of the oxadiazole-functionalized Tb(III) 3-diketonate (complex 34) and [Tb(acac-azain)3]2 (complex 35) [58]. (Reprinted with permission from R.Y. Wang et al., Syntheses, structures, and electroluminescence of Ln2(acac-azain)4(p.-acac-azain)2 [acac-azain = 1-(V-7-azaindolyl)-l,3-butanedionato, Ln = Tb(III) and Y(J]1) Inorganic Chemistry, 41, 5187-5192, 2002. 2002 American Chemical Society.)...

Fig. 42. Molecular structure of Ca(hfac)2(tetraglyme) showing the nonbonded terminal ether group (0(14)). The Ca—O ether and /3-diketonate bond distances have a range of 2.434(3)-2.497(3) A and 2.395(3)-2.4IO(3) A, respectively. (Redrawn from Ref. 188.)...

The syntheses, physical properties, and molecular structures of alkoxides and aryloxides have been discussed in CCC (1987).161 The alkoxides of scandium and yttrium were reviewed in CCC (1987).1 There have been more recent developments in this area and the impetus for this chemistry has been the developments in materials research. Metal alkoxides and /3-diketonates can be used as precursors for oxide and nonoxide thin films.162 The stable M—O bond and the volatility of the metal alkoxides are important features of this area of chemistry. This has lead to more research in this area particularly in synthesis, NMR, and X-ray crystallography. 

Figure 3.4. Molecular structure formula of P-diketonate ligand...

Many kinds of (i-diketonate precursors can be synthesised with different R] and R2 groups some of them are listed in Table 3.1. The molecular structure formula is shown in Figure 3.4. 

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