The interrelation between noncovalent bonds and physicochemical properties is in the spotlight due to the practical aspects in the field of crystalline material design. Such study requires a number of similar substances in order to reveal the effect of structural features on observed properties. For this reason, we analyzed a series of three substituted thiazolo[2,3-b][1,3]thiazinium triiodides synthesized by an iodocyclization reaction. They have been characterized with the use of X-ray diffraction, Raman spectroscopy, and thermal analysis. Various types of noncovalent interactions have been considered, and an S…I chalcogen bond type has been confirmed using the electronic criterion based on the calculated electron density and electrostatic potential. The involvement of triiodide anions in the I…I halogen and S…I chalcogen bonding is reflected in the Raman spectroscopic properties of the I–I bonds: identical bond lengths demonstrate different wave numbers of symmetric triiodide vibration and different values of electron density at bond critical points. Chalcogen and halogen bonds formed by the terminal iodine atom of triiodide anion and numerous cation…cation pairwise interactions can serve as one of the reasons for increased thermal stability and retention of iodine in the melt under heating.

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X-ray diffraction study of tetranuclear organobismuth complexes Bi 4 ( O ) 2 ( O 2 CC 6 H 2 F 3 -3,4,5) 8 · 2η 6 -ë 6 ç 6 and Bi 4 (O) 2 (O 2 CC 6 H 2 F 3 -3,4,5) 8 · 2(ë 6 ç 4 Me 2 -1,4) revealed four Bi atoms connected through the bridging carboxylate ligands and the O atoms. The coordination sphere of the terminal Bi atoms includes the chelate carboxylate ligand and the η 6 -arene molecule. The bridging O atoms are tricoordinated, the distances between the terminal Bi atom and the center of benzene molecule (1,4-dimethylbenzene) are 3.024 Å (3.131 Å).

Pentaphenyl‐wismut (I) reagiert mit Alkoholen, z.B. Isopropanol (II), bei 20°C quantitativ zu Triphenyl‐wismut (III), Aceton (IV) und Benzol (V) während die Umsetzung mit Phenol zu einem komplizierten Gemisch führt.