Thermochromism of bromotellurates(iv): experimental insights

Abstract

Thermally induced changes in optical properties (thermochromism) in an extended series of 16 bromotellurate(iv) complexes were investigated; regularities valid for this class of compounds were established.

Supramolecular Diiodine-Bromostannate(IV) Complexes: Narrow Bandgap Semiconductors

“…The optical band gaps for these two complexes are 1.68 and 1.69 eV, respectively, which is more than for similar diiodo-bromotellurates described by us earlier (1.41-1.74, with average 1.55 eV [40]). The overall features of these spectra are quite common for p-block halometalates [49,50].…”

Water-Soluble Bismuth(III) Polynuclear Tyrosinehydroximate Metallamacrocyclic Complex: Structural Parallels to Lanthanide Metallacrowns

“…Therefore, the shape of F(R) qualitatively approximates the absorption spectrum. The procedure described in [ 35 ] was applied to determine the value of the gap (E g ) of interband electronic transitions. In the range of the electronic transition, the dependence of the absorption coefficient α on the energy E has the form: α = A ( E − E g ) m / E where A and m are the constants of the electronic transition and E g is its energy.…”

“…Samples were dissolved in high purity D 2 O (Sigma Aldrich, St Louis, MO, USA), and the chemical shifts were referenced to the solvent peak. Diffuse reflection spectra were measured with a spectrophotometric system consisting of a Kolibri-2 spectrometer (VMK “Optoelectronika,” Novosibirsk, Russia), an FCR-7UV400-2-ME reflection/backscattering probe (Avantes, The Netherlands), and an AvaLight-DHS light source (Avantes, The Netherlands) [ 35 ]. The spectra were recorded in the 400–1000 nm range.…”

A mononuclear iron(iii) complex with unusual changes of color and magneto-structural properties with temperature: synthesis, structure, magnetization, multi-frequency ESR and DFT study

“…An interesting phenomenon often related to SCO is thermochromismthe ability to change color upon a change in temperature. This phenomenon has been observed in various classes of organic and inorganic compounds [10][11][12] as well as in iron complexes. [13][14][15][16] However, there are also certain iron(III) compounds where thermochromism is not caused by SCO, although such cases are rare.…”