K.S. Nagaraja

Sublimation Kinetic Studies of the Complex

The thermal behaviour of tetrakis(2,2,6,6-tetramethyl-3,5-heptanedionato)zirconium(IV), [Zr(tmhd)4] was investigated by nonisothermal and isothermal thermogravimetric methods in a high pure nitrogen atmosphere. The influence of the heating rate in dynamic measurements (6, 8, 10, and 12°C/min) on activation energy was also studied. The nonisothermal sublimation activation energy values determined following the procedures of Arrhenius, Coats and Redfern, Kissinger, and Flynn-Wall yielded , , , and u2009kJ/mol, respectively, and the isothermal sublimation activation energy was found to be u2009kJ/mol over the temperature range of 411–462u2009K. Different reaction mechanisms were used to compare with this value. Analysis of the experimental results suggested that the actual reaction mechanism was an deceleration type.

Development and vapour pressure of metallo-organic precursors of copper for the deposition of copper thin films by a plasma-assisted MOCVD

ABSTRACT A group of metallo-organic complexes of copper, namely bis(N-R-salicylaldiminato)Cu(II) (R: methyl to n-pentyl, hereafter referred to as 1–5) were prepared and their volatile nature was confirmed by TG/DTA. The molecular masses (M) of 1–5 were confirmed by mass spectrometry. The vapour pressure (pe) for precursors 1–5 determined by a transpiration technique using the Clausius–Clapeyron relation yielded the values of 91 ± 2, 84 ± 4, 100 ± 2, 92 ± 2, and 72 ± 2 kJ mol−1 for ΔHovap, respectively, for 1–5. The thin films deposited by plasma-assisted MOCVD technique contain predominantly metallic copper in <111> orientation. The SEM images of the thin films exhibit continuous nanoball-like structure.

3-[(3-Hydroxypropyl)amino]-1-phenyl-but-2-en-1-one.

The title compound, C13H17NO2, has an intramolecular N—H⋯O hydrogen bond, forming a planar six-membered ring with a mean deviation of 0.015u2005(5)u2005Å from the plane. This plane makes a dihedral angle of 7.19u2005(8)° with the adjacent phenyl ring. Through an intermolecular O—H⋯O hydrogen bond, the molecules with their 21 screw and b-translation equivalents form a helical chain running parallel to the b axis.