What is VBT in coordination compounds?
Valence bond theory(VBT) was developed by Linus Pauling. The main assumption made by him was that the metal-ligand bonds are formed by the donating of an electron pair by the ligand to the metal and thus form a coordinate Bond between the metal and ligand.
What are the salient features of valence bond theory VBT in coordination compounds?
1) A central metal ion provide number of vacant s,p & d orbital to ligands to form coordinate bond. 2) Number of vacant orbitals provided by central metal ion will equal to its coordination number. 3) Vacant orbital of central metal ion overlaps with filled orbitals of ligands to form coordinate bond.
What is the basic principle of VBT?
Valence Bond theory describes covalent bond formation as well as the electronic structure of molecules. The theory assumes that electrons occupy atomic orbitals of individual atoms within a molecule, and that the electrons of one atom are attracted to the nucleus of another atom.
What are the merits of VBT?
Merits of Valence bond theory: Valence bond theory explains the geometrical shape and magnetic properties of complexes satisfactorily. It explains the formation of inner complexes in the presence of strong ligands and outer complexes in the presence of weak ligands.
What are the applications of VBT?
Applications. An important aspect of the valence bond theory is the condition of maximum overlap, which leads to the formation of the strongest possible bonds. This theory is used to explain the covalent bond formation in many molecules.
What are the limitations of VBT in coordination compounds?
Limitations of Valence Bond Theory It does not give a quantitative interpretation of the thermodynamic or kinetic stabilities of coordination compounds. No distinction between weak and strong ligands. No explanation for the colour exhibited by coordination compounds.
What are the merits and demerits of valence bond theory?
Valence bond theory does not give information regarding magnetic moment due to the orbital contribution of electrons. It can not explain the spectral properties of complexes. It does not explain the relative stability of complex compounds.
What does valence bond theory say?
Valence bond theory became successful in explaining the structure and bond linkages in these coordination compounds. So, what does the valence bond theory say? According to this theory, the metal atom or ion under the influence of ligands can use its (n-1) d, n s, n p, n d orbitals for hybridisation.
How accurate is the valence bond theory about 4-coordinate complexes?
The various predictions that the valence bond theory makes regarding the tetrahedral and square planar structures of 4-coordinate complexes are not completely accurate. It does not draw any distinctive line between the weak and strong ligands.
What is the coordination theory of complex compounds?
• It was the first successful explanation, became famous as the coordination theory of complex compounds, which is also known as Werner’s theory. 7. Postulates: • The central metal atom (or) ion in a coordination compound exhibits two types of valencies – primary and secondary.
When is a coordinate bond stronger than a hybrid bond?
• Coordinate bond is stronger if the overlapping between the orbitals is greater. 43. • The vacant orbitals of the metal atom (or) ion undergo suitable hybridisation to yield a set of equivalent hybrid orbitals of definite geometry. 44.