Related Experiment Video
Updated: Apr 22, 2026
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Five types of odd-even effect and crystal structure changes brought about by ω-phenylalkyl group in [Ni(dmit)₂]
Masahiro Saeki1, Kotaro Dai, Shuhei Ichimura
1Department of Chemical Sciences and Technology, Graduate School of Chemical Sciences and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-601, Japan. jb112708@ed.tus.ac.jp miyamura@rs.tus.ac.jp.
Abstract:
A series of [Ni(dmit)2] (dmit: 1,3-dithiole-2-thione-4,5-dithiolate) salts of ω-phenylalkyl-trimethylammonium (CnPh: n is the alkylene chain length; n = 2-5) have been prepared and characterized by X-ray crystallographic structural analysis. All complex salts are found to be composed of an alternating stack of [Ni(dmit)2] anions and CnPh cations, whereas the crystal structures are different in each complex. Interestingly, this series exhibited five types of odd-even effects in the crystal structures: 1. [Ni(dmit)2] anion length, 2. CnPh cation length, 3. orientation of the alkylene group against the terminal phenyl group, 4. relative orientation of the terminal phenyl group against [Ni(dmit)2] anions, 5. structure of dimerized [Ni(dmit)2] anions. The last odd-even effect led to an unusual vertical dimer structure. The vertical dimer is a unique structure in [M(dmit)2] complex salts (M = transition metal) and has not been reported. The introduction of a terminal phenyl group is concluded to have increased the steric effect and led to a marked structural difference between odd and even-numbered complex salts, i.e. the odd-even effect.
More Related Videos
06:35Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
07:57Author Spotlight: A Rapid, Microwave-Assisted Hydrothermal Synthesis Of Nickel Hydroxide Nanosheets
Published on: August 18, 2023
Related Concept Videos
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...
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...
02:42Valence Bond Theory
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...
02:34Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly,...
01:19Complexation Equilibria: The Chelate Effect