Heterotermetallic indium lithium halostannates: low-temperature single-source precursors for tin-rich indium tin oxides and their application for thin-film transistors.

The syntheses and structural elucidation of dimeric [Sn(OCyHex)(2)] (1), its corresponding (cyclohexoxy)alkalistannates(II) [{M(OCyHex)(3)Sn}(2)] (M = Li (2), Na (3), K (4)), and of the first heteroleptic heterotermetallic Li/In/Sn-haloalkoxide clusters [X(2)In{LiSn(2)(OCyHex)(6)}] (X = Br (5), Cl (6)) with a double seco-norcubane core are reported. They represent suitable precursors for new amorphous indium tin oxide (ITO) materials as transparent conducting oxides with drastically reduced concentrations of expensive indium, while maintaining their high electrical performance. In fact, compounds 5 and 6 were successfully degraded under dry synthetic air at relatively low temperature, resulting in new semiconducting tin-rich ITOs homogeneously dispersed in a tin oxide/lithium oxide matrix.

Raman and photoluminescence spectroscopic detection of surface-bound Li(+)O2(-) defect sites in Li-doped ZnO nanocrystals derived from molecular precursors.

We present a detailed study of Raman spectroscopy and photoluminescence measurements on Li-doped ZnO nanocrystals with varying lithium concentrations. The samples were prepared starting from molecular precursors at low temperature. The Raman spectra revealed several sharp lines in the range of 100-200 cm(-1), which are attributed to acoustical phonons.

Unprecedented alkylzinc-magnesium alkoxide clusters as suitable organometallic precursors for magnesium-containing ZnO nanoparticles.

The synthesis and characterization of the first heterobimetallic methylzinc-magnesium alkoxide clusters [Me(6)MgZn(6)(OR)(8)] [R=Et (1 a), n-Pr (1 b), nBu (1 c)] with a bis-cubane-shaped MgZn(6)O(8) core is described. The thermal degradation of 1 a-c and mixtures of 1 a and the homometallic MeZn-alkoxide cubane [{MeZnOtBu}(4)] (2) in dry synthetic air led to wide-band-gap semiconducting Mg(x)Zn(1-x)O nanoparticles at temperatures below 500 °C. The final materials were characterized by different analytical techniques such as PXRD, REM, TEM, EDX, and IR spectroscopy.

Activation of C-H bonds mediated by Mo[triple bond]Mo moieties in heterobimetallic Zn/O/Mo clusters.

Heterobimetallic drive and cooperativity lead to a striking scenario for C-H bond activation and heteroaggregation involving Mo(III) dimers. Reaction of (RO)(3)Mo[triple bond]Mo(OR)(3) with molar excess of ZnMe(2) at-78 degrees C affords the novel mixed Zn, Mo oxo clusters [Mo(2)(MeZn)(6)(mu(2)-Me)(mu(3)-CH(2))(2)(OR)(7)] 1 (R = neopentyl) and 2 (R = cyclohexyl) preserving the Mo[triple bond]Mo triple bond, while the same reaction performed at ambient temperature gives rise to the related cluster [Mo(2)(MeZn)(6)(mu(2)-CH(2))(mu(3)-CH(2))(2)(OR)(6)] 3. These complexes represent the first examples of heterobimetallic Mo[triple bond]Mo complexes with bridging methyl and methylene groups and agostic C-H-->Mo interactions, as well as penta-coordinate carbon.

One-pot synthesis of lithium alkylzinc alkoxo heterocubanes with a LiZn3O4 core as suitable organometallic precursors for Li-containing ZnO nanocrystals.

A convenient and efficient synthesis of the stable monolithium alkylzinc alkoxo cubanes {Li(thf)(RZn)(3)(OR')(4)} [R = Me, R' = (i)Pr (1), (t)Bu (2); R = Et, R' = (i)Pr (3), (t)Bu (4)] is reported. They are well soluble in organic solvents and suitable molecular precursors for the formation of Li-containing ZnO nanoparticles. The compounds are accessible by a convenient one-pot reaction of the respective dialkylzinc with lithium alkoxides in the presence of water and can be isolated as white solids in 35-50% yield.