The crystal structures of nine hexamethyl-[1,1′-biphenyl]-4,4′-diammonium (HMB) salts are described: the iodide ( 2 ), triiodide ( 3 ), succinate ( 4 ), fumarate ( 5 ), tetravanadate ( 6 ), hydroterephthalate ( 7 ) and perylenetetracarboxylate ( 8 ), as well as pentamethyl-[1,1′-biphenyl]-4,4′-diammonium iodide ( 1 ) and the metal–organic framework sodium diacetylenedisalicylate–HMB ( 9 ). HMB carbonate ( 10 ) has been synthesized as an important intermediate for a promising anti-metal–organic framework (`anti-MOF'). All the described compounds are characterized by high solubility in water. The results suggest that, during crystallization, crystallohydrates are formed from water. Compounds 6 and 9 are characterized by the presence of a rigid framework; compound 6 has an open framework structure filled with water molecules. Synchronous thermal analyses of compounds 2 , 4 , 6 , 7 , 8 and 10 allowed the identification of similarities in the mechanisms of thermolysis. At about 80–180°C, the loss of crystallization water molecules occurs. Between 180 and 250°C, a methyl group (methyl cation) is split off from the quaternary ammonium salt to form tetramethylbenzidinium. In the case of the iodides and salts of organic acids, the second thermolysis product is the methyl ester of this acid (methyliodide, dimethyl carbonate), which easily evaporates. In the range 240–355°C, tetramethylbenzidinium evaporates without decomposition.

Rajakumar Kanthapazham

Artyom A. Osipov

Dmitry A. Zherebtsov

Andrey N. Efremov

Sergey A. Nayfert

Sergey A. Adonin

Dar'ya V. Spiridonova

Sergey V. Atapin

Acta Crystallographica Section B Structural Science Crystal Engineering and Materials

ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 发表与最广泛意义上的化合物和材料结构科学相关的科学文章。了解原子的排列，包括它们的时间变化以及对温度和压力的依赖性，通常是理解物理和化学现象的关键，对于新材料和超分子器件的设计至关重要。 ACTA CRYSTALLOGRAPHICA B 是发表此类文稿的论坛。发表了基于实验研究以及基于理论方法的科学发展，包括晶体结构预测、结构-性质关系和晶体结构数据库的使用。

Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials publishes scientific articles related to the structural science of compounds and materials. Understanding the arrangement of atoms, including their temporal variations and dependencies on temperature and pressure, is often crucial for comprehending physical and chemical phenomena, and is essential for the design of new materials and supramolecular devices. Acta Crystallographica Section B serves as a forum for such research, covering scientific advancements based on both experimental studies and theoretical methods, including crystal structure prediction, structure-property relationships, and the use of crystal structure databases.

《Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials》发表与化合物和材料结构科学相关的科学文章。了解原子的排列及其随时间变化、温度和压力的依赖性，通常是理解物理和化学现象的关键，这对于新材料和超分子器件的设计至关重要。《Acta Crystallographica Section B》是发表此类研究的论坛，涵盖基于实验研究和理论方法的科学进展，包括晶体结构预测、结构-性质关系及晶体结构数据库的应用。

Category	Quartile
化学	3
化学, 晶体学	3
化学, 化学综合	4

Structures of hexamethyl-[1,1′-biphenyl]-4,4′-diammonium salts

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