Related Experiment Video
Updated: May 25, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
Published on: February 5, 2022
cis-Dichloridobis(di-2-pyridyl-amine-κN,N')manganese(II)
1School of Applied Chemical Engineering, The Research Institute of Catalysis, Chonnam National University, Gwangju 500-757, Republic of Korea.
Abstract:
In the title complex, [MnCl(2)(C(10)H(9)N(3))(2)], the Mn(II) ion is six-coordinated in a considerably distorted cis-N(4)Cl(2) octa-hedral environment defined by four N atoms of two chelating di-2-pyridyl-amine (dpa) ligands and two Cl(-) anions. In the crystal, the dpa ligands are not planar, the dihedral angles between the two pyridine rings being 29.3 (2) and 30.9 (2)°. The complex mol-ecules are stacked in columns along the c axis and are connected by inter-molecular N-H⋯Cl hydrogen bonds, forming a three-dimensional network. Weak inter- and intra-molecular π-π inter-actions are present between the pyridine rings, the shortest centroid-centroid distance being 4.406 (3) Å.
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...
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...
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Valence Bond Theory
Formation of Complex Ions
Coordination Number and Geometry

