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in subjects: "Iron Complexes"

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Resolution of safety issues associated with the storage of high-level radioactive waste at the Hanford Site

A number of high-level radioactive waste (HLW) safety issues have been identified at the Hanford Site in southeastern Washington State. Resolution of these issues is one of the Highest Priorities of the US Department of Energy. The most urgent issues are the potential for explosions in certain tanks (due to periodic venting of large quantities of flammable gases, or the presence of substantial quantities of ferrocyanide and/or organic compounds in combination with nitrates-nitrites). Other safe… more

Date: August 1, 1992

Creator: Mellinger, G. B. (Pacific Northwest Lab., Richland, WA (United States)) & Tseng, J. C. (USDOE Assistant Secretary for Environmental Restoration and Waste Management, Washington, DC (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Coal technology program. Progress report for December 1976

This report, the twenty-ninth of a series, is a compendium of monthly progress reports for the ORNL research and development programs that are in support of the increased utilization of coal as a source of clean energy. The projects reported this month include those for coal conversion process development, materials engineering, alkali metal vapor topping cycles, a critical components test facility, engineering and support studies, process and program assistance, environmental assessment studie… more

Date: February 1, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Ferrocyanide Safety Project: FY 1991 annual report

The Hanford Ferrocyanide Task Team is addressing issues involving ferrocyanide precipitates in the single-shell waste storage tanks (SSTs), in particular the risk of explosion. This Task Team, which is composed of researchers from Westinghouse Hanford Company (WHC), Pacific Northwest Laboratory (PNL), an outside consultants, was formed in response to the need for an updated analysis of safety questions on the Hanford SSTSs. The Ferrocyanide Safety Project, discussed in this report, is being con… more

Date: June 1, 1992

Creator: Hallen, R. T.; Burger, L. L.; Hockey, R. L.; Lilga, M. A.; Scheele, R. D. & Tingey, J. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Neutron diffraction studies of transition metal hydride complexes. [Complexes with C/sub 5/H/sub 6/, CO, NO, P(OCH/sub 3/)/sub 3/]

Investigations of H/sub 3/Ta(C/sub 5/H/sub 5/)/sub 2/ (III), HW/sub 2/(CO)/sub 9/(NO) (IV), and HW/sub 2/(CO)/sub 8/(NO) (P(OCH/sub 3/)/sub 3/) (V) have been completed. Preliminary results are available for HFeCo/sub 3/(CO)/sub 9/(P(OCH/sub 3/)/sub 3/)/sub 3/ (VII). This work, together with studies of HMo/sub 2/(C/sub 5/H/sub 5/)/sub 2/(CO)/sub 4/(P(CH/sub 3/)/sub 2/) (VI) and ((C/sub 2/H/sub 5/)/sub 4/N)/sup +/ (HCr/sub 2/(CO)/sub 10/)/sup -/ carried out at Argonne has led to some general obse… more

Date: January 1, 1976

Creator: Koetzle, T F & Bau, R

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Moessbauer spectroscopic investigation of radiation damage of Co(III)-HEDTA and Fe(III)-HEDTA complexes

The chemical effect of the electron capture of /sup 57/Co isotope in solid organic complexes was studied as a function of dimeric and monomeric structures of the same molecule as well as a function of the environment of the molecule in crystalline solid and frozen solutions of the same molecule. The /sup 57/Co was prepared in the forms of CO(III)-HEDTA and Fe(III)-HEDTA. In crystalline /sup 57/Co(III)-HEDTA dimer the daughter /sup 57/Fe of two valency states was observed in the ratio 75 percent… more

Date: January 1, 1976

Creator: Nagy, A. G.; Dezsi, I. & Hillman, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Electron Transfer Reactions of Excited Dyes With Metal Complexes. Progress Report, May 1, 1976--January 31, 1977. [Fe(III)--Thionine Reaction]

A study was initiated of the factors which determine quantum efficiency of transfer of reducing equivalents between excited dye molecules and metal complexes in their ground state and composition and dynamics of formation and decay of related photostationary states. A ruby laser capable of delivering a 3.6 J, 19 nsec flash was acquired and assembly of an apparatus for laser flash photolysis begun. At the same time, conventional flash photolysis was used to pursue investigation of the dependence… more

Date: February 1, 1977

Creator: Lichtin, N. N.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Transition metal chemistry under high carbon monoxide pressure: an infrared spectroscopic study of catalysis in the Fischer--Tropsch reaction. [7 refs]

This project involves the design and construction of equipment to investigate the infrared spectra of metal carbonyl derivatives in the 1600 to 2200 cm./sup -1/ nu(CO) region at pressures up to 500 atmospheres and temperatures up to 250/sup 0/ followed by the use of this equipment to study the infrared spectra of a variety of transition metal derivatives at elevated pressures of carbon monoxide. The ultimate objective of this work is the discovery of new chemistry leading to the development of … more

Date: January 1, 1977

Creator: King, R. B.; King, A. D., Jr.; Iqbal, M. Z. & Frazier, C. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Molecular motions in a viscous organic liquid: ferrocene in cold butyl phthalate

The two main purposes of this work were to learn (a) if rotational diffusion can be seen along with translational, and (b) is (x(T)/sup 2/) unusual as the sample is heated from a glass to a liquid. Our observations show that (a) rotational molecular diffusion is not likely ever to be observed by quadrupole relaxation and (b) that there is indeed a fast increase in (x/sup 2/) above T/sub g/. This increase is correlated with a rapid and linear increase of the number of ''soft modes'' for the liqu… more

Date: January 1, 1976

Creator: Ruby, S. L.; Zabransky, B. J. & Flinn, P. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Minutes of the Tank Waste Science Panel meeting July 9--1, 1991

The fifth meeting of the Tank Waste Science Panel was held July 9--11, 1991, in Atlanta, Georgia. The subject areas included the generation, retention, and release of gases from Tank 241-SY-101 and the chemistry of ferrocyanide wastes.

Date: April 1, 1992

Creator: Strachan, D. M. (comp.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Separation processes for high-level radioactive waste treatment

During World War II, production of nuclear materials in the United States for national defense, high-level waste (HLW) was generated as a byproduct. Since that time, further quantities of HLW radionuclides have been generated by continued nuclear materials production, research, and the commercial nuclear power program. In this paper HLW is defined as the highly radioactive material resulting from the processing of spent nuclear fuel. The HLW is the liquid waste generated during the recovery of … more

Date: November 1, 1992

Creator: Sutherland, D. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Regeneration of FGD waste liquors: Production of ammonium and potassium sulfate mixed fertilizer. Quarterly technical report, July 1993--September 1993

Regeneration of the Fe{sup II}-EDTA scrubbing liquors for simultaneous removal of SO{sub 2} and NO{sub x} in flue gas involves removing the nitrogen-sulfur (N-S) compounds accumulated in the liquor. In this paper, the authors investigated a simple regeneration process which selectively precipitates the N-S compounds as potassium salts and then hydrolyzes them to yield ammonium/potassium sulfate as a marketable byproduct. They believe this is the first report on precipitation and hydrolysis char… more

Date: December 1, 1993

Creator: Randolph, A. D. & Kwon, T. M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Catalytic oxidation of hydrocarbons by dinuclear iron complexes. Progress report

Our efforts during the past eight months were directed towards characterizing synthetic complexes that model the electronic and reactivity properties of the active site of methane monooxygenase (MMO), a metalloenzyme found in methanotrophic bacteria responsible for the biological oxidation of methane to methanol. We have investigated the structural/electronic and reactivity properties of a series of dinuclear model complexes that can function as oxygen atom transfer catalysts. In particular, ou… more

Date: October 1, 1993

Creator: Caradonna, J. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Fundamental studies of reactive intermediates in homogeneous catalysis

The studies involve dissociation of Fe(CO){sub n}{sup {minus}}, Ni(CO){sub n}{sub {minus}}, and other carbonyl anions; decarboxylation of (CO){sub 4}FeCOOH{sup {minus}} to form CO{sub 2} and (CO){sub 4}FeH{sup {minus}} in the water gas shift reaction; gas-phase bimolecular reactions of carbonyl anions and O{sub 2}; reaction of O{sub 2} with CpMn(CO){sub 2}{sup {minus}}; gas-phase chemistry of fullerene anions; and gas-phase thermochemistry of bicarbonate ion, bisulfite ion, and their conjugate … more

Date: October 1, 1993

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Thermally-generated reactive intermediates: Trapping of the parent ferrocene-based o-quinodimethane and reactions of diradicals generated by hydrogen-atom transfers

Ferrocenocyclobutene is prepared by flash vacuum pyrolysis (FVP) of the N-amino-2-phenylaziridine hydrazone of 2-methylferrocenealdehyde. In the second section of this dissertation, a series of hydrocarbon rearrangements were observed. FVP of o-allyltoluene at 0.1 Torr (700--900 C) gives 2-methylindan and indene, accompanied by o-propenyltoluene. FVP of 2-methyl-2`-vinylbiphenyl gives 9-methyl-9,10-dihydrophenanthrene, which fits the proposed mechanism. However, FVP of 2-(o-methylbenzyl)styrene… more

Date: September 1, 1993

Creator: Ferguson, J. M.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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Highly nucleophilic acetylide, vinyl, and vinylidene complexes. Progress report

The research was divided into the following: studies of nucleophilic and chiral acetylide complex [Cp(CO)(PPh{sub 3})Mn-C{triple_bond}CR]{sup {minus}}; nucleophilic addition of carbene anions to organic ligands on electrophilic complexes; halide-promoted carbonylation of imido ligands; binuclear Fe{sub 2} complexes with bridging organonitrogen ligands; addition and cycloaddition reactions of carbyne complex [Cp(CO){sub 2}Re{triple_bond}CTol]{sup +}; addition and cycloaddition reactions of methy… more

Date: June 15, 1992

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Electrocatalysts for Oxygen Electrodes. Final Report

Object was to understand factors controlling the activity of O{sub 2} reduction and generation electrocatalysts, in order to attain higher activity and longer-term stability. Two broad classes of catalysts were developed: transition metal macrocycles in monomeric and polymeric forms, and transition metal oxides including perovskites and pyrochlores. 20 refs., 14 figs.

Date: February 1, 1993

Creator: Yeager, E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Novel bimetallic dispersed catalysts for temperature-programmed coal liquefaction. Technical progress report, January--March 1993

The ultimate goal of the present research is to develop novel catalytic hydroliquefaction process using highly active dispersed catalysts. The primary objective of this research is to develop novel bimetallic dispersed catalysts from organometallic molecular precursors, that can be used in low concentrations (<l%) but exhibit high activity for efficient hydrouquefaction of coals under temperature-programmed conditions. In this quarter, we have synthesised several bimetallic complexes that conta… more

Date: July 1, 1993

Creator: Parfitt, D. S.; Song, Chunshan & Schobert, H. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The single electron chemistry of coals. [Quarterly] report, October 1--December 31, 1992

Radical cation generation in coal may make possible depolymerization at low temperature. This possibility was investigated using single molecules containing functional groups common in coals. Single- electron oxidations of 4,4{prime}-dimethoxybibenzyl (DMBB) by Fe(III) (1,10-phenanthroline){sub 3}(ClO{sub 4}){sub 3}, in refluxing CH{sub 3}CN, gave incomplete mass balances; an attempt was made to identify the additional products. Part of these products were deduced to be dimer, p-methoxybenzylat… more

Date: December 31, 1992

Creator: Larsen, John W. & Eskay, T. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Selective transformation of carbonyl ligands to organic molecules. Progress report, November 15, 1992--November 14, 1993

This report is divided into: manganese acyls as hydrosilation substrates/precatalysts; manganese carbonyl-catalyzed hydrosilation of organic compounds; and indenyl ruthenium carbonylation chemistry.

Date: August 10, 1993

Creator: Cutler, A. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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1: Redox chemistry of bimetallic fulvalene complexes; 2: Oligocyclopentadienyl complexes

The electrochemistry of the heterobimetallic complexes (fulvalene)WFe(CO){sub 5} (30) and (fulvalene)WRu(CO){sub 5} (31) has been investigated. Compound 30 is reduced in two one-electron processes, and this behavior was exploited synthetically to prepare a tetranuclear dimer by selective metal reduction. Complex 31 displayed a distinction between the metals upon reoxidation of the dianion, allowing the formation of a dimer by selective metal anion oxidation. The redox behavior of 30 led to an i… more

Date: November 1, 1993

Creator: Brown, D. S.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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Advanced separation technology for flue gas cleanup. Quarterly technical report No. 4

The objective of this work is to develop a novel system for regenerable S0{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (a) a novel method for regeneration of spent S0{sub 2} scrubbing liquor and (b) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (HFC) are proposed as the devices for scrubbing the S0{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub x} and more tha… more

Date: April 1, 1993

Creator: Gottschlich, D.; Bhown, A.; Ventura, S.; Sirkar, K. K.; Majumdar, S. & Bhaumik, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Enzymological studies of one-carbon reactions in the pathway of acetate utilization by methanogenic bacteria

Several enzymes in the pathway of acetate conversion to methane and carbon dioxide have been purified from Methanosarcina thermophila. The mechanisms of these enzymes are under investigation utilizing biochemical, biophysical and molecular genetic approaches. Acetate kinase and phosphotransacetylase catalyzes the activation of acetate to acetyl-CoA. The primary structure of these enzymes will be determined through cloning and sequencing of the genes. Two protein components of the CO dehydrogena… more

Date: December 31, 1991

Creator: Ferry, J. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Intramolecular energy transfer reactions in polymetallic complexes.. Progress report, 1991--1992

(1) Excited-state energy transfer: The major effort was an attempt to sensitize the photoelimination of H{sub 2} from a bimetallic, metal-dihydride complex. These complexes have involved Fe, Ru, and Co complexes. (2) Excited-state electron transfer (charge separation): A series of diad and triad complexes were prepared in order to sustain charge separation in an artificial photosynthetic system.

Date: December 1, 1992

Creator: Petersen, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Removal of deuterium from flowing nitrogen by SAES St 198

Testing was conducted to investigate the ability of a metal getter, SAES St 198, to remove D{sub 2} from flowing nitrogen. This getter is being considered for applications involving removal of tritium at low concentrations from glovebox atmospheres and inert or nitrogen process streams. This document reports results from tests involving flow of 107 ppM D{sub 2} in nitrogen through a packed bed of St 198 getter granules (1.02 mm average dia) at a gas flow rate of 400 std. cm{sup 3}{center_dot}mi… more

Date: December 31, 1992

Creator: Nobile, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department