Perhaps a better interpretation of the reduction properties, however, is one that places the added electrons in a ligand * MO of bm symmetry (Figure 7).The bathochromic shift of the M -L (b3g -* Ltt*) transition in the electronic spectra of the adducts and the energy of this transition relative to that of the d-d transition62 suggest that, in the adducts, the ligand * MO of bm symmetry is of lower energy than the dxy metal orbital. The per cent metal character of the (52) From the reported by Carlin and Canziani63 for Co(Dto)a3t he energy of the transition for the Ni(Dto)z2_ is calculated to occur at 17,700 cm-1. A shoulder found at 17,700 cm-1 in the spectrum of Ni(Dto)z2_ has been assigned43 to the transition. In agreement with the stronger M-S bonding in the adducts is the fact that, in the adducts, larger values of are generally observed.64 (53) R. L. Carlin and F. Canziani, J. Chem. Phys., 40,371 (1964). ( 54) D. Coucouvanis and D. Piltingsrud, J. Amer. Chem. Soc., in press.bm MO cannot be ascertained, although the reduction properties of the adducts and the stability of the reduction products clearly depend66 on the type of metal atom bonded to the -diketone portion of the coordinated dithiooxalate ligand and to a lesser extent on the environment about this atom.

No abstract

A 10-nm-thick PbZr0.25Ti0.75O3 thin film is epitaxially grown on a SrRuO3/BaTiO3/ZrO2/Si heterostructure substrate by reactive evaporation. Structural and electrical properties of the film are investigated. It is concluded that the film is ferroelectric and retains a native uniform upward polarization. Artificial downward polarization domains, whose average diameter is 24 nm, can be formed in the film.

Collisional activation spectra have identified (CH,),C=OH (a), C,H,CH=OH (d), CH,=OC,H, (h) and CH,CH=OCH3 (i) as stable ion structures. Evidence is presented for a variety of pathways for their formation, including anchimeric assistance and hydrogen migration in less stable isomers. The fragmentation behavior of a number of [C,H,,,,O]+ isomers of n = 2 to 5 shows that extensive rearrangements are common, but that some reactions appear to be useful for ion structure elucidation. One reaction identified is unusual in that it represents the decomposition of an even-electron ion to yield an odd-electron ion product in significant abundance.