Part I. Molecular dichroism, optical and catalysis studies of several metalloporphyrins. Part II. Solid state studies

Miscellaneous · Fri Jan 01 00:00:00 EST 1993

OSTI ID:6908723

Sito, M L

Part 1. Tetra(4-N-methylpyridyl)porphyrinatopalladium (II), [Pd-TMpyP][sup 4+], was prepared by a new technique, purified and intercalated with calf thymus DNA. The Soret and Q band regions were studied using Circular Dichroism (CD) and magnetic Circular Dichroism (MCD). The MCD measurements in Soret and Q band regions and CD of the Q band regions are reported for the first time. The known photocatalyst, tetra(4-pyridyl)porphyinato-zinc(II), was covalently bonded to the surfaces of both iodinated (Ia) and chlorinated (Ib) cross-linked poly(siloxane) materials. Thermal catalytic activity was found to be present, and it was quantitatively measured using olefin oxidation of styrene to acetophenone. The zinc porphyrin supported on iodinated poly(siloxane) showed an over 12-fold increase in catalytic activity, as measured by turnover numbers, compared to the chlorinated support material. Part II. The plasmas produced by ablation of YBa[sub 2]Cu[sub 3]O[sub 7] single-phase high T[sub C] bulk superconductors when exposed to XeCl excimer laser pulses have been studied. The luminescence of the laser-induced vapor plume have been analyzed using optical emission spectroscopy. Excited atomic neutral and single ionized species (Cu/Cu[sup +], Ba/Ba[sup +], Y/Y[sup +]) as well as some molecular emission bands (CuO, YO) were observed within the experimental resolution of an optical multichannel analyzer detection system. A liquid mediated pulse laser irradiation procedure was used in the attempt to form thin layers of carbides and nitrides of silicon. A boron doped single crystal (100) of silicon was irradiated while immersed in cyclohexane or liquid ammonia. Irradiation of the samples was carried out using a 308 nm excimer laser. The laser pulses had energy densities of 0.5 to 3.0 J cm[sup [minus]2] and the number of pulses used ranged from 1 to 50. The specimens were analyzed using specular reflectance and auger electron spectroscopies.

• Research Organization: North Carolina State Univ., Raleigh, NC (United States)
• OSTI ID: 6908723
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BARIUM OXIDES
ABLATION
CUPRATES
ORGANOMETALLIC COMPOUNDS
CATALYTIC EFFECTS
MAGNETIC CIRCULAR DICHROISM
PORPHYRINS
YTTRIUM OXIDES
AUGER ELECTRON SPECTROSCOPY
HIGH-TC SUPERCONDUCTORS
INTERMETALLIC COMPOUNDS
LASER-PRODUCED PLASMA
OPTICAL PROPERTIES
SPECTRAL REFLECTANCE
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
CARBOXYLIC ACIDS
CHALCOGENIDES
COPPER COMPOUNDS
DICHROISM
ELECTRON SPECTROSCOPY
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLASMA
SPECTROSCOPY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
664200* - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)