Related Experiment Video
Updated: Jun 18, 2026

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
Published on: November 27, 2015
Interactions between dimers of {1,1'-[o-phenylenebis(nitrilomethylidyne)]di-2-naphtholato-kappa4O,N,N',O'}nickel(II)
1Department of Chemistry, J. J. Strossmayer University, Osijek, Franje Kuhaca 20, HR-31000 Osijek, Croatia.
Abstract:
In the title compound, [Ni(C(28)H(18)N(2)O(2))], the Ni(II) centre has a square-planar coordination geometry in which the Schiff base ligand acts as a cis-O,N,N',O'-tetradentate ligand. The crystal structure is built up of centrosymmetric dimer units stacked into chains along the [010] direction. Adjacent chains associate via C-H...O hydrogen bonding only, leading to a two-dimensional sheet-like structure consisting of layers parallel to (101). The cofacial dimeric complex contains an Ni...Ni contact of 3.291 (4) A.
Related Concept Videos
Structural 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, SCN− can be...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
Diels–Alder Reaction: Characteristics of Dienes
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

