Thermal analysis, phase transitions and molecular reorientations in [Fe(OS(CH3)2)6](ClO4)2

Abstract

Thermogravimetric analysis connected with quadruple mass spectroscopy (TG/MS) for an identification of [Fe(OS(CH 3 ) 2 ) 6 ](ClO 4 ) 2 decomposition products, carried out to determine its thermal stability, has indicated that the title compound does not change its mass till ca. 385 K. Above this temperature, it starts slowly to lose a part of (CH 3 ) 2 SO ligands, which begins to form a liquid phase, in which the title compound partially dissolves. Finally, at ca.

Dielectric switching in correlation with the structural phase transitions in tetrapropylammonium perchlorate

“…Since the literature for the assignment of vibrations of both ClO 4 − and TePrA + ions is quite rich, 21–28 we will further focus on two features: (i) the real symmetry of the crystal and (ii) the influence of temperature on its behavior near PTs.…”

“…620 cm -1 . All of them are Raman active, but only two of them, of F 2 symmetry, are also infrared active 23 , 29 . However, due to the placement in a crystal, with imposed site and factor-group symmetry, the bands should be split into several more.…”

“…À and TePrA + ions is quite rich, [21][22][23][24][25][26][27][28] we will further focus on two features: (i) the real symmetry of the crystal and (ii) the influence of temperature on its behavior near PTs. This journal is © the Owner Societies 2023…”

“…All of them are Raman active, but only two of them, of F 2 symmetry, are also infrared active. 23,29 However, due to the placement in a crystal, with the imposed site and factor-group symmetry, the bands should be split into several more. The main difference between the two phases (LT and RT) is the absence/presence of an inversion center, which means that in the LT phase, some modes are both IR-and Raman-active, while in the RT phase, they should be either IR-or Raman active (mutual exclusion rule).…”

Magneto-Structural Relationship of Tetragonally-Compressed Octahedral Iron(II) Complex Surrounded by a pseudo-S6 Symmetric Hexakis-Dimethylsulfoxide Environment

“…Four inter-ligand CH•••O hydrogen bonds were found in a complex cation (Figure 1b), affording a 16-membered chelating ring perpendicular to the tetragonal compression axis. Earlier, the crystal structure of [Fe(dmso) 6 ][SnCl 6 ] 2 (2) was reported [12], and phase transition behavior was investigated for [Fe(dmso) 6 ][ClO 4 ] 2 [13], but complex 1 has not been reported so far. Among the six dmso moieties of the [Fe(dmso)6] 2+ complex cation in 1, four of t were found to be disordered, suggesting the sulfur-inversion motion as well as th balt(II) and zinc(II) derivatives [14,15].…”