metal-to-metal bond
2.It is concluded from above assignments that the experimental absorption peak for (n=1, 2, 3, 5) are characterized as the charge transfer from metal to ligands (MLCT), Moreover, the conjugated p(C=C) bond have significant contribution to it, thus the increase of the number of C=C bond lead to the delocalization of p electron and make the electronic absorption spectra red-shift, which is well agreed with the experimental founding by Gladysz and Bruce.
3.A cube of 6×4×3mm~3 was made after such preparation, besides three groups were polished with rubber and the other three groups were not polished, and then made a metal crown for each sample, afterwards three kinds of luting cements Zinc phosphate cement (ZOP), glass ionomer cement(GIC),and resin cement (RC) were selected to bond the metal full crowns to the samples of each group.
5.COORDINATON OF NEIGHBORING C-H a BOND TO TRANSITION METAL CENTER --LOCALIZED INDO STUDY OF [Fe(PH_3)_3(C_8H_(13)]~+
6.The results of this work show that through adding active element Ti to the filler metal, the A12 O3 grains in the brazing seam are decreased or e-liminated, and the concentration of A12O3 grains in the seam is avoided, the ionic covalent bond A12O3 is transformes to metallic bond TiO, so that the matching - ability of the brazing seam matrix and the grain phase is enhanced.
