Infrared studies of phase transitions in ferroelectric (C5H5NH)5Bi2Br11

Vibrational Response of Methylammonium Lead Iodide: From Cation Dynamics to Phonon–Phonon Interactions

“…Note that hydrogen bonding (H‐bond) plays a fundamental role in governing the local interactions . The changes in the vibrational signature of the NH modes is clear evidence of the evolution of the H‐bond strength, the increase of which with decreasing temperature is a marker of cation ordering.…”

Structural, vibrational and optical properties of a new self assembled organic–inorganic nanowire crystal (C6H14N)2[BiBr5]. A Density Functional Theory approach

“…Among these compounds, the bismuth-bromide based perovskites have been extensively investigated since they have demonstrated a propensity for forming a variety of crystalline structures by self assembling from suitable solutions mixtures. Within the inorganic component, the Bismuth bromide octahedra can be connected in one of three ways: face, edge or corner sharing forming naturally isolated molecules (0D) [14][15][16], infinite chains (1D) [17] or two dimensional (2D) networks. In conjunction with some current research works on these metal halides compounds, the crystal structure, optical properties and vibrational studies of many organic-inorganic crystals have been investigated in our laboratory [18][19][20][21][22].…”

Pt/TiO2 brain biocompatible nanoparticles: GBM treatment using the C6 model in Wistar rats

“…The remaining two bands, at 1257 and 1230 cm À1 , have to be associated with the existence of pyridinium cations and hence with Brö nsted acid sites. Tarasiewicz et al [19] ascribed a band at 1261 cm À1 to a combination of C-C stretching modes and C-H deformation modes in the pyridinium cation in C 5 H 5 NH) 5 Bi 2 Br 11 . On the other hand, the band at 1230 cm À1 corresponds to the n 3 mode of pyridine adsorbed on Lewis acid sites.…”