Reentrant structural and optical properties of organic–inorganic hybrid metal cluster compound ((n-C₄H₉)₄N)₂[Mo₆Brⁱ₈Br^a₆]

Abstract

We report the reentrant phase transition of the organic–inorganic hybrid metal cluster (MC) compound (TBA)2[Mo6Bri8Bra6] (TBA = ((n-C4H9)4N)). Structural studies revealed that (TBA)2[Mo6Bri8Bra6] was crystallized in the conventional monoclinic phase...

On the high-temperature phase transition of a new chlorocadmate(ii) complex incorporating symmetrical Cd2Cl6 clusters: structural, optical and electrical properties

“…Another class of hybrid materials are called double perovskites with a chemical formula A 2 B 2 X 6 (A = Cs or organic cations; X = Cl, Br, or I), which can be regarded as derivatives of single perovskite APbX 3 but with Pb replaced by other metal cations. [15][16][17][18][19][20][21][22][23] Nevertheless, most double perovskites which are predicted to have good electronic properties, oen suffer from instability issues such as phase separation or redox decomposition, e.g., Cs 2 InBiCl 6 and Cs 2 InSbCl 6 (ref. 24) while double perovskites that can be synthesized usually show large indirect band gaps.…”

Crystal structure of formamidinium–lead–chloride–dimethyl sulfoxide and phase relationship of related crystalline systems

“…The quenching of the thermally activated rotational, flipping, or twisting motions of the ions at lower temperatures may cause the phase transitions of crystals involving molecular ions. However, FA + ions are well aligned even at room temperature, as demonstrated by the X-ray diffraction study at 298 K. It is likely that any reentrant phase transitions 35 may not occur in this system because of the restriction of the alignment of FA + ions. Hence, it is plausible that the FAPbCl 3 -DMSO crystallized in a monoclinic lattice shows no phase transitions at temperatures below 298 K. For a deeper understanding of the crystallographic features of organic-inorganic hybrid crystals, a detailed analysis of the utilization and dispersion correction of DFT calculations, 36,37 is under progress in the authors' group.…”