Thermal deprotonation and condensation of melamine in the presence of indium(<scp>iii</scp>)chloride

Bayat, Elaheh; Ströbele, Markus; Enseling, David; Jüstel, Thomas; Meyer, H.-Jürgen

doi:10.1039/d4dt01029a

Dalton Trans.

2024

DOI: 10.1039/d4dt01029a

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Thermal deprotonation and condensation of melamine in the presence of indium(iii)chloride

Elaheh Bayat,

Markus Ströbele,

David Enseling

et al.

Abstract: The thermal deprotonation of melamine in the presence of InCl3 leads to the novel [C12N20H8]4− tetramer, based on four melaminate ions.

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Metal‐Halide–Melem Compounds Based on M₆‐, M₉‐ and M₁₂‐Clusters

Ströbele,

Enseling,

Jüstel

et al. 2024

Eur J Inorg Chem

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The polymerization of melamine is known to lead to the formation of melam and melem with increasing temperature. Solid‐state reactions of metal halides with melem (2,6,10‐triamino‐s‐heptazine, C6N7(NH2)3) in the vicinity of 500 °C have resulted in the formation of a number of melem adducts that are structurally characterized. The isotypic series M6X12(melem)4 is represented by compounds with M = Ca, X = Br (1), M = Sr, X = Br (2), I (3); M = Ba, X = I (4); and M = Pb, X = Br (5). A special feature in the crystal structures of these compounds is the presence of M6‐metal halide clusters. M9‐ and M12‐metal cluster appear as face‐sharing double‐clusters in (Pb9Br19)2(Pb1.5Br2)2(melem)3(6) and as triple‐clusters in (Pb12Br25)4(Pb1.67Br2)3(melem)4(7). All compounds are characterized by single‐crystal and powder X‐ray diffraction, and further validated by infrared (IR) spectroscopy and 207Pb and 79/81Br NMR studies on (5). Photoluminescence studies on compound (6) reveal emission at 430 nm while the emission of (5) is completely quenched.

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Metal‐Halide–Melem Compounds Based on M₆‐, M₉‐ and M₁₂‐Clusters

Ströbele,

Enseling,

Jüstel

et al. 2024

Eur J Inorg Chem

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A Systematic Study of the Solid-State Pathway from Melamine via Melaminate to Carbodiimide under Evolution of Hydrogen

Ströbele,

Bayat,

Meyer

2024

Inorg. Chem.

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Thermal analysis techniques, such as differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), can provide valuable insights into thermal properties, intermediate phases, and phase transitions; sometimes even a whole series of compounds appears in a given system. The solid-state reaction pathway from melamine to carbodiimide, monitored by DSC, involves a sequence of chemical reactions and intermediate phases departing from the reaction of potassium hydride and melamine. The fully analyzed reaction cascade begins with the formation of potassium melaminate, K(C 3 N 6 H 5 ), and progresses through several intermediate phases, each with distinct structures and properties, before ultimately yielding β-K 2 (CN 2 ). All crystalline compounds appearing in this reaction sequence are identified using X-ray diffraction analyses. With a 6:1 ratio of potassium hydride and melamine, equal numbers of protic and hydridic hydrogen atoms in the starting materials favor the release of H 2 until the formation of the final product K 2 (CN 2 ), which appears with two modifications.

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Thermal deprotonation and condensation of melamine in the presence of indium(iii)chloride

Abstract: The thermal deprotonation of melamine in the presence of InCl3 leads to the novel [C12N20H8]4− tetramer, based on four melaminate ions.

Cited by 2 publications

References 46 publications

Metal‐Halide–Melem Compounds Based on M₆‐, M₉‐ and M₁₂‐Clusters

Metal‐Halide–Melem Compounds Based on M₆‐, M₉‐ and M₁₂‐Clusters

A Systematic Study of the Solid-State Pathway from Melamine via Melaminate to Carbodiimide under Evolution of Hydrogen

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Thermal deprotonation and condensation of melamine in the presence of indium(iii)chloride

Abstract: The thermal deprotonation of melamine in the presence of InCl3 leads to the novel [C12N20H8]4− tetramer, based on four melaminate ions.

Cited by 2 publications

References 46 publications

Metal‐Halide–Melem Compounds Based on M6‐, M9‐ and M12‐Clusters

Metal‐Halide–Melem Compounds Based on M6‐, M9‐ and M12‐Clusters

A Systematic Study of the Solid-State Pathway from Melamine via Melaminate to Carbodiimide under Evolution of Hydrogen

Contact Info

Product

Resources

About

Metal‐Halide–Melem Compounds Based on M₆‐, M₉‐ and M₁₂‐Clusters

Metal‐Halide–Melem Compounds Based on M₆‐, M₉‐ and M₁₂‐Clusters