Halobismuthates with halopyridinium cations: appearance or non-appearance of unusual colouring

Abstract

A series of chloro- and bromobismuthate complexes with bromopyridinium cations were prepared and characterized by XRD analysis and diffuse reflectance spectroscopy.

The Isocyanide Complexes cis-[MCl2(CNC6H4-4-X)2] (M = Pd, Pt; X = Cl, Br) as Tectons in Crystal Engineering Involving Halogen Bonds

“…Strategies of crystal engineering towards the design of solids with controllable structure and tunable physicochemical properties are amongst the well-recognized tools for material chemistry [1][2][3][4][5]. The emergence of halogen bonding (HaB; for reviews on HaB see references [6][7][8][9][10]) during the construction of supramolecular aggregates opens up a route for the optimisation of their valuable properties, such as catalytic activity [11][12][13][14][15], solubility [16,17], melting point [18], thermal expansion [19][20][21][22], colour [23][24][25][26][27], luminescence [28][29][30][31][32][33][34][35][36][37][38][39][40][41], sensing [42,43], biological [44], and magnetic [45] properties. Various tectons [46], including organic species or metal complex...…”

Assembling Polyiodides and Iodobismuthates Using a Template Effect of a Cyclic Diammonium Cation and Formation of a Low-Gap Hybrid Iodobismuthate with High Thermal Stability

“…The analysis of the crystal structures of hybrid iodobismuthates shows that features other than the dimensionality of the Bi/I substructure play an important role in controlling the band gap width. Namely, they are multifold weak interactions that include hydrogen bonds (mainly (N)H•••I) as well as interanionic I•••I interactions [36][37][38][39][40][41][42]. DFT calculations reveal that weak non-covalent bonds are capable of promoting charge mobility along the direction of spreading such bonds in the crystal structure [34][35][36][37][38][39].…”

Halogen Bonding in Isostructural Co(II) Complexes with 2-Halopyridines

“…Regarding all of the approaches in the field of crystal engineering, halogen bonding (XB) has attracted great interest within modern research [1,2]. This type of non-covalent interaction involving halogen atoms (according to the IUPAC-approved definition, the bond "occurs when there is evidence of a net attractive interaction between an electrophilic region associated with a halogen atom in a molecular entity and a nucleophilic region in another, or the same, molecular entity") becomes especially prominent in a solid state, and its appearance can affect numerous physical properties of matter, such as luminescence [3][4][5], solubility [6], color [7], and so forth, therefore providing an additional tool for material design [8][9][10].…”