996 resultados para Pseudo-pure states


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Full Title: Report of the Committee appointed to inquire into the Present condition and distribution of the flags, standards and colors, which have been taken by the forces of the United States from their enemies, and whether it would be expedient to make any provision in relation to them Adam Seybet, Chairman. Exhibit folded at end of text. February 4, 1814. Read, and committed to a committee of the whole House on Monday next. Printed by A and G Way

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On leaf preceding the t.p.: Battles of Chippawa and Lundy's Lane, by Charles Anderson, guide to the battle ground. On box: Chippawa and Lundy's Lane. Printed by John Simpson

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Consists of 4 cancelled stamps on an envelope addressed to Mr. Oscar Stein, Greenwood Lake, N.Y. The envelope is postmarked August 2, 1948, Niagara Falls, New York.

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"February 7, 1817, ordered to be printed for the use of the Senate." Message addressed to the Senate and dated February 7th, 1817. Consists of the covering letter from the President and a report from the Secretary of State, dated Department of State, February 5th, 1817; which itself consists largely of diplomatic correspondence between the United States and Great Britain Relates to the restitution of captured slaves by the British during the War of 1812-1814.

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"June 1st, 1812. Referred to the Committee on Foreign Relations. June 3d, 1812. Bill reported, declaring war ..."

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Includes rare 1816 battle plan map.

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Message from the President of the United States transmitting a letter from the Marshal of the Northern District of the State of New York, respecting Disturbances on the Canadian Frontier.

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Bound with: Letter from the Secretary of the Treasury transmitting statements of the importations of goods, wares and merchandise... (60 p.).

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1. Triarylamminium radical-cation complexes. The detailed study of manganese, copper and nickel metal-radical complexes with triarylamminium ligands was conducted. Stable, neutral and pseudo-octahedral coordination monometallic complexes with simple monodentate 2,2`-bipyridine ligand containing a redox-active N,N`-(4,4`-dimethoxydiphenyl-amino) substituent were synthesized and fully characterized. The one-electron oxidation process and formation of persistent radical-cation complexes was observed by cyclic voltammetry and spectroelectrochemical measurements. Evans method measurements were performed with radical-cation complexes generated by chemical one-electron oxidation with NOPF6 in acetonitrile. The experimental results indicate ferromagnetic coupling between metal and triarylamminium cation in manganese (II) complex and antiferromagnetic coupling in nickel (II) complex. This data is supported by DFT calculations which also lend weight to the  spin polarization mechanism as an operative model for magnetic exchange coupling. Neutral bimetallic complexes with a new ditopic ligand were synthesized and fully characterized, including magnetic and electrochemical studies. Chemical oxidation of these precursor complexes did not generate radical-cations, but dicationic complexes, which was confirmed by UV-vis and EPR-experiments, as well as varied temperature magnetic measurements. DFT calculations for radical-cation complexes are included. A synthetic pathway for polytopic ligand with multiple redox-active triarylamine sites was developed. The structure of the ligand is presumably suitable for -spin polarization exchange model and allows for production of polymetallic complexes having high spin ground states. 2. Base-catalyzed hydrosilylation. A simple reductive base-catalyzed hydrosilation of aldehydes and ketones was adapted to the use of the cheap, safe, and non-toxic polymethylhydrosiloxane (PMHS) instead of the common PhSiH3 and (EtO)3SiH, which present significant cost and safety concerns, respectively. The conversion of silane into pentacoordinate silicate species upon addition of a base was studied in details for the cases of phenyl silane and PMHS and is believed to be essential for the hydrosilylation process. We discovered that nucleophiles (a base or fluoride-anion) induced the rearrangement of PMHS and TMDS into light silanes: MeSiH3 and Me2SiH2, respectively. The reductive properties of PMHS under basic conditions can be attributed to the formation of methyl silane and its conversion into a silicate species. A procedure for the generation of methyl silane and its use in further efficient reductions of aldehydes and ketones has been developed. The protocol was extended to the selective reduction of esters and tertiary amides into alcohols and aldimines into amines with good isolated yields and reduction of heterocyclic compounds was attempted.