Heat of formation of N-dimethylaminodiborane

Johnson, Walter H.; Jaffe, Irving; Prosen, E.J.

doi:10.6028/jres.065a.007

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…HEATS OF FORMATION.-N2& ,21 H (52.1),22 NH3 (-11),23 CH3NHNH2 (22.4),24 CH3NH2 (-5.1),25 (CH&NNHz (19.7) 24 and (CH3)2NH (-4.5). 25 The errors in these values are unlikely to be significant.…”

Section: Appendix B O N D D I S S O C I a T I O N Energies I N A M M ...mentioning

confidence: 97%

Kinetics and sites of methyl radical attack on dimethylamine and deuterated dimethylamine

Gray¹,

Jones²,

Thynne³

1965

Trans. Faraday Soc.

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The photolysis of azoniethane in the presence of dimethylamine and dimethylamine-dl has been studied over the temperature range 120-180°C in order to determine the position and rates of methyl radical attack in dimethylamine. H-abstraction has been shown to occur at both the methyl and amine sites, the rate of abstraction being greater at the amine group.At 150°C seven out of every nine hydrogen atoms abstracted come from the amine groups and two from the methyl groups. On a per-atom basis, hydrogen attached to nitrogen is thus twenty times mwe reactive than hydrogen attached to carbon in dimethylamine.Arrhenius parameters (based on a value of 1013.34 cm3 mole-1 sec-1 for the recombination of methyl radicals) for the following reactions are :10.8 6.4Assuming a zero secondary isotope effect, the relative reactivities of H and D (primary isotope effect) are in accord with zero-point-energy differences.

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Section: Appendix B O N D D I S S O C I a T I O N Energies I N A M M ...mentioning

confidence: 97%

Kinetics and sites of methyl radical attack on dimethylamine and deuterated dimethylamine

Gray¹,

Jones²,

Thynne³

1965

Trans. Faraday Soc.

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“…from the enthalpy of formation of methane (12) and the enthalpy of atomization of carbon ( 12), E(C-N) = 67.48 kcal. from the enthalpy of formation of dimethylamine (9), and E(N-H) = 93.43 kcal. from the enthalpy of formation of ammonia (12).…”

Section: Resultsmentioning

confidence: 99%

Enthalpies of combustion and formation of 1,1-bis(difluoroamino) heptane. N-F thermochemical bond energy

Good¹,

Smith²

1970

J. Chem. Eng. Data

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The enthalpy of combustion of liquid 1,1 -bis(difluoroamino)heptane was measured in a rotating-bomb calorimeter. The enthalpy of vaporization was estimated. The experimental enthalpy of combustion and the estimated enthalpy of vaporization were used to calculate the following values, in kcal. per mole at 298.15°K ., for this compound: standard enthalpy of formation of the liquid from graphite and gaseous hydrogen, fluorine, and nitrogen, -64.82; standard enthalpy of formation of the gas (estimated), -52.8. The N-F thermochemical bond energy in 1,1-bis-(difluoroamino) heptane was estimated to 67.3 kcal., about the same as the N-F thermochemical bond energy in NF3, N2F4, and 1,2-bis(difluoroamino)-4-methylpentane, but several kilocalories less than the N-F thermochemical bond energy in perfluoropiperidine.

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Radio-wave propagation in the earth's crust

Wheeler¹

1961

J. RES. NATL. BUR. STAN. SECT. D. RAD. PROP.

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There is a reasonable basis f or post ul ating t he existenc e of a useful waveg uide deep in the earth's crust, of t he order of 2 t o 20 km below the s urface. Its di electric is basem ent I'Oc], of very low condu ctivity. Its upper boundary is formed by the conductive layers ncar the surface. Its lower boundary is formed by a h igh-temperature condu ctive layer far below the surface, termed the "thermal ionosphere" by analogy to the well-known "radiation ionosphere" far above the surface.The electrical conductivity of th e basem.ent rock has not been explored. An example based on reasonable estimates indicates that transmission at 1.5 kc/s might be possible for a distance of the order of 1500 km.This waveguide is located under land and sea over t he entire surface of th e earth. It may be useful for rad io transmission from t he s hore to a submarine on the fl oor of t he ocean. The sending antenna might be a long conductor in a dri ll hole deep in the basement rock ; the receivi ng antenna might be a vertical loop in t he water .

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Heat of formation of N-dimethylaminodiborane

Cited by 3 publications

References 7 publications

Kinetics and sites of methyl radical attack on dimethylamine and deuterated dimethylamine

Kinetics and sites of methyl radical attack on dimethylamine and deuterated dimethylamine

Enthalpies of combustion and formation of 1,1-bis(difluoroamino) heptane. N-F thermochemical bond energy

Radio-wave propagation in the earth's crust

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