<i>s</i>-Triazine. II. The Near Ultraviolet Absorption Spectrum

Hirt, R. C.; Halverson, Frederick; Schmitt, R. G.

doi:10.1063/1.1740306

Cited by 56 publications

(11 citation statements)

References 5 publications

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“…The lowest electronic transition of the isolated molecule, assigned to the superposition of two groups of nπ* transitions, is centered at ambient pressure at about 270 nm. 33 The lowest ππ* state is reported at about 220 nm with a onephoton cross section about 1/3 of the allowed nπ* transition. The electronic origin corresponding to the first nπ* transition ( 1 E″ state) is inactive in the isolated molecule, but it is activated in the rhombohedral crystal phase and is observed at ambient conditions at 333 nm.…”

Section: Resultsmentioning

confidence: 98%

Pressure and Laser-Induced Reactivity in Crystalline s-Triazine

Citroni

Fanetti²,

Bini

2014

J. Phys. Chem. C

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The high-pressure transformation of s-triazine to an extended amorphous carbon incorporating a large amount of nitrogen has been studied by Fourier transform infrared spectroscopy. The reaction, occurring at ambient temperature around 8 GPa, is found to be extremely sensitive to temperature, as the reaction onset is lowered to 4 GPa at 530 K. Also, laser irradiation allows a very selective trigger of the reactivity below the ambient temperature threshold likely due to the population of ππ* states. Independently of temperature and irradiation conditions, two different products are obtained once the reaction is activated at 3.5–4.0 GPa or above 8 GPa. The low pressure product is likely composed by conjugated domains forming in the monoclinic ab planes, whereas with rising pressure interactions between the planes destroy the sp2 clusters increasing the concentration of N bearing terminating groups and severely affecting the mechanical properties of the extended material.

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Section: Resultsmentioning

confidence: 98%

Pressure and Laser-Induced Reactivity in Crystalline s-Triazine

Citroni

Fanetti²,

Bini

2014

J. Phys. Chem. C

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“…Comparison of 3-amino-as-triazine' with 2-amino-s-triazine (pKb 9.9 vs. 11.1) shows the asymmetric derivative to be a somewhat stronger base. The parent compound, s-triazine, decomposes rapidly in aqueous solution (5), but its pKb is estimated to be greater than 13 from nonaqueous titrations and hydrolysis studies.…”

Section: Discussionmentioning

confidence: 99%

Spectrophotometrically Determined Ionization Constants of Derivatives of Symmetric Triazine.

Hirt¹,

Schmitt²,

Strauss³

et al. 1961

J. Chem. Eng. Data

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“…The s-triazine derivative, melamine, can in principle occur in various tautomeric forms, and although the name " melamine " is commonly applied to the tautomer (I)-s-triaminotriazine-there is no definite evidence 1 that the actual molecule has this structure. General chemical considerations suggest that the compound would have a structure with D3h symmetry, but the tautomeric isomelamine (11) -s-tri-iminohexahydrotriazine-fulfils this requirement equally well.…”

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confidence: 99%

The electronic structure of melamine

Dewar¹,

Paoloni²

1957

Trans. Faraday Soc.

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The Pariser-Pam a.s.m.0. treatment has been applied to melamine. The observed spectrum of melamine agrees with that predicted for s-triaminotriazine but not with that predicted for s-tri-iminohexahydrotriazine. The application of the Pariser-Parr treatment to compounds containing amino nitrogen is considered in detail. Various integrals required in the treatment are evaluated, and the choice of suitable initial m.0.s is discussed. Simple Huckel m.0.s proved unsatisfactory, presumably because they overestimate charge transfer. Good results were obtained with m.0.s calculated for an analogous hydrocarbon obtained by replacing each pyridine-type nitrogen by carbon, and each amino nitrogen by a vinyl group. The coefficients of each pair :f a.0.s in a vinyl group are then combined to give a single coefficient of the nitrogen a.0. 10 26 1 * The atomic integrals (pplpp) here involved can be obtained in another empirical way independent of W, and A, (L. Paoloni, unpublished results).

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s-Triazine. II. The Near Ultraviolet Absorption Spectrum

Cited by 56 publications

References 5 publications

Pressure and Laser-Induced Reactivity in Crystalline s-Triazine

Pressure and Laser-Induced Reactivity in Crystalline s-Triazine

Spectrophotometrically Determined Ionization Constants of Derivatives of Symmetric Triazine.

The electronic structure of melamine

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