pH-Dependent elution behaviour of meleme in high-performance cation-exchange chromatography

Ono, Satoshi; Inoue, Yasuhiko; Watanabe, Naohiro; Yoshimura, Toshiaki; Morita, Hiroyuki; Shiroishi, Akihiro; Takakura, Makoto; Shimasaki, Choichiro

doi:10.1016/s0021-9673(96)00495-5

Cited by 6 publications

(2 citation statements)

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“…2−26 Thermal treatment of melamine leads to condensation reactions, forming melam (C 6 N 10 H 6 ) and melem (C 6 N 11 H 9 ) with increasing temperature, with release of ammonia. 27,28 The course of the thermal conversation reactions of melamine has been shown to depend on a subtle interplay of reaction conditions with respect to temperature, pressure, and the specific reaction rate. 28,29 Thermally induced reactions of melamine involve the formation of compounds which include sizable assemblies of 1,3,5-triazine moieties; the involvement of other reactants into such a reaction can have a significant effect on the reaction pathway.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The discovery of melamine (C 3 N 6 H 6 , or 1,3,5-triazine-2,4,6-triamine) dates back to the work of Liebig in 1834 . Since then, a remarkable number of derivative compounds, including supramolecular assemblies, flame-retardant materials, and melamine formaldehyde resins, have emerged, even as materials used in our daily life. − Thermal treatment of melamine leads to condensation reactions, forming melam (C 6 N 10 H 6 ) and melem (C 6 N 11 H 9 ) with increasing temperature, with release of ammonia. , The course of the thermal conversation reactions of melamine has been shown to depend on a subtle interplay of reaction conditions with respect to temperature, pressure, and the specific reaction rate. , …”

Section: Introductionmentioning

confidence: 99%

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Tricopper Melaminate, a Metal–Organic Framework Containing Dehydrogenated Melamine and Cu–Cu Bonding

et al. 2021

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Crystals of Cu 3 (C 3 N 6 H 3 ) are formed by a solid-state reaction of CuCl with melamine to form a layered framework structure with open pores running along the hexagonal axis direction of the P6/mcc structure. The compound contains the hitherto unknown (C 3 N 6 H 3 ) 3− ion, assigned as melaminate. Bonding interactions within and between Cu−Cu dumbbells, which connect melaminate ions into layers, are analyzed by density functional theory calculations of the electron localization function and directional Young's modulus. Band structure calculations reveal the material to be a semiconductor with a band gap on the order of 2 eV.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tricopper Melaminate, a Metal–Organic Framework Containing Dehydrogenated Melamine and Cu–Cu Bonding

et al. 2021

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The Tautomeric Forms of Cyameluric Acid Derivatives

El‐Gamel

Seyfarth

Wagler

et al. 2007

Chemistry A European J

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The tautomerism of cyameluric acid C6N7O3H3 (1 a), cyamelurates and other heptazine derivatives has recently been studied by several theoretical investigations. In this experimental study we prepared stannyl and silyl derivatives of cyameluric acid (1 a): C6N7O3[Sn(C4H9)3]3 (3 a), C6N7O3[Sn(C2H5)3]3 (3 b), and C6N7O3[Si(CH3)3]3 (4). In order to investigate the structure of 1 a the mono- and dipotassium cyamelurate hydrates K(C6N7O3H2)2 H2O (5) and K2(C6N7O3H)1 H2O (6) were synthesized by UV/Vis-controlled titration of a potassium cyamelurate solution with aqueous hydrochloric acid. Compounds 3-6 were characterized by FTIR and solid-state NMR spectroscopy as well as simultaneous thermal analysis (TGA, DTA). The single crystal X-ray structures of the salts 5 and 6 show that the hydrogen atoms in both anions are localized on the peripheral nitrogen atoms. This indicates-in combination with the solid-state NMR studies-that the most stable tautomer of solid 1 a is the triketo form with C3h symmetry. However, derivatives of both the hydroxyl and the amido tautomers may be formed depending on the substituent atoms: The spectroscopic data and single crystal structures of compounds C6N7O3[Si(CH3)3]3 (4) and the solvate C6N7O3[Sn(C2H5)3]3C2H4Cl2 (3 b') show that the former is derived from the symmetric trihydroxy form of 1 a, while 3 b' crystallizes as a chain-like polymer, which contains the tin atoms as multifunctional building blocks, that is, bridging pentacoordinated Et3SnO2 and Et3SnON units as well as non-bridging four-coordinated Et3SnN units. The cyameluric nucleus is part of the polymeric chains of C6N7O3[Sn(C2H5)3]3C2H4Cl2 (3 b'), by the action of both tautomeric forms of cyameluric acid, the amide and the ester form.

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Three Heterocyclic Rings Fused (6-6-6)

Strękowski

Henary

2008

Comprehensive Heterocyclic Chemistry III

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pH-Dependent elution behaviour of meleme in high-performance cation-exchange chromatography

Cited by 6 publications

References 5 publications

Tricopper Melaminate, a Metal–Organic Framework Containing Dehydrogenated Melamine and Cu–Cu Bonding

Tricopper Melaminate, a Metal–Organic Framework Containing Dehydrogenated Melamine and Cu–Cu Bonding

The Tautomeric Forms of Cyameluric Acid Derivatives

Three Heterocyclic Rings Fused (6-6-6)

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