Publication

Complexes of biguanide and malonic-diamidine

Dieter Schwarzenbach
1977
Journal Articles

Abstract

The importance of the central N atom of biguanide (L) in the stability of transition metal complexes [ML2]2+ (M = Cu, Ni) is strikingly demonstrated by replacing the NH by CH2. The novel ligand thus obtained is malonic diamidine (L'). [ML'2]Cl2 (M = Cu, Ni) were prepd. and their structures detd. by x-ray diffraction. Unlike [ML2]2+, the [ML'2]2+ complexes are not planar, one of the C atoms connecting the amidine groups being above and the other below the plane of the coordination square. Bond distances and angles in the 2 types of complex cations are discussed. The fact that the 2 amidine groups share no electrons and do not act in unison is no doubt the reason for the decreased stability of [ML'2]2+ in comparison with [ML2]2+. The latter therefore are stabilized by resonance energy to an appreciable extent.

Official source

https://infoscience.epfl.ch/entities/publication/12a39fee-87ea-43b6-9056-08e847b557f5

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Dieter Schwarzenbach
1977
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/12a39fee-87ea-43b6-9056-08e847b557f5

About this result

Related concepts (32)

Coordination complex

A coordination complex is a chemical compound consisting of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands or complexing agents. Many metal-containing compounds, especially those that include transition metals (elements like titanium that belong to the periodic table's d-block), are coordination complexes. Coordination complexes are so pervasive that their structures and reactions are described in many ways, sometimes confusingly.

Octahedral molecular geometry

In chemistry, octahedral molecular geometry, also called square bipyramidal, describes the shape of compounds with six atoms or groups of atoms or ligands symmetrically arranged around a central atom, defining the vertices of an octahedron. The octahedron has eight faces, hence the prefix octa. The octahedron is one of the Platonic solids, although octahedral molecules typically have an atom in their centre and no bonds between the ligand atoms. A perfect octahedron belongs to the point group Oh.

Coordination geometry

The term coordination geometry is used in a number of related fields of chemistry and solid state chemistry/physics. Molecular geometry The coordination geometry of an atom is the geometrical pattern formed by atoms around the central atom. In the field of inorganic coordination complexes it is the geometrical pattern formed by the atoms in the ligands that are bonded to the central atom in a molecule or a coordination complex.

Related publications (8)

Complexes of biguanide and malonic-diamidine

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