Related Experiment Video
Updated: Nov 25, 2025
Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
Published on: March 19, 2017
Thermodynamic Properties, Structural Characteristics, and Cation Dynamics of Perovskite-Type Layer Crystal
Ae Ran Lim1,2
1Analytical Laboratory of Advanced Ferroelectric Crystals, Jeonju University, Jeonju 55069, Korea.
Abstract:
In this study, we investigated the structural dynamic features of the [NH3(CH2)2NH3]ZnCl4 crystal as a function of temperature through magic angle spinning (MAS) 1H nuclear magnetic resonance (NMR), MAS 13C NMR, and static 14N NMR. From the chemical shifts, changes in the structural environments of 13C and 14N were evident. The 1H spin-lattice relaxation time (T 1ρ) values at high temperatures undergo molecular motion according to the Bloembergen-Purcell-Pound theory, and the 13C T 1ρ value also varied abruptly with increasing temperature. Although the phase-transition temperature was not detected from the differential scanning calorimetry result, the chemical shifts and T 1ρ results showed discontinuities around 300 K. Herein, the activation energies of molecular motion for 1H and 13C obtained from T 1ρ are discussed. In addition, we compare the structural dynamics of diammonium-type [NH3(CH2)2NH3]ZnCl4 obtained in this study and monoammonium-type [CH3NH3]2ZnCl4 previously reported. The findings reported herein can provide important insights for potential applications of [NH3(CH2)2NH3]ZnCl4 crystals.
More Related Videos
08:12Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
04:14Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
Related Concept Videos
02:42Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
02:37Metallic Solids
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
02:48Ionic Bonding and Electron Transfer
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
01:07Ladder Diagrams: Complexation Equilibria
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...