Asked by: Jennifer Newhouse
Which plays a major role in the formation of complex compounds?
What is formation of complex compound?
such weak bonds is called complex formation—that is, formation of a new chemical species, called a complex, which is held together by weak forces that are chemical in nature rather than physical. Such complexes usually exist only in solution; because of their low stability, they cannot, in general, be isolated.…
What are the factors on which the stability of a complex depends?
There are several factors that can affect the stability of the metal complexes [2, 5, 8, 9], which include:
- Nature of the central metal ion.
- Nature of the ligand.
- Chelating effect.
- Macrocyclic effect.
- Resonance effect.
- Steric effect or steric hindrance.
Why the transition elements form a large number of complex compounds?
Transition elements form a large number of complex compounds due to the comparatively smaller sizes of the metal ions; their high ionic charges and the availability of d-orbitals for bond formation.
How size of cation affect the stability of a complex?
Size of metal ion : As the size of the metal ion decreases, the stability of complex increases.
III. Basic strength : The more basic a ligand, the greater is the ease with which it can donate its lone pair of electrons and therefore, the greater is stability of the complexes formed by it.
How do you know which complex is more stable?
Thermodynamically it is favoured that a complex having monodentate ligand tends to react with either polydentate or bidentate ligands in order to form a chelate complex, as this is driven by entropy. Thus, bidentate or polydentate are considered to be more stable.
How do charge and size of central metal ion affect the lability of complexes?
ii) Charge on the Central Metal Atom: A smaller, more highly charged ion allows a closer and faster approach of the ligands and greater force of attraction. This results in the formation of a stable complex. In general, the greater the charge on the central metal ion, the greater the complex’s stability.
How does the nature of ligand influence the formation and stability of complexes?
Stronger the ligand, more stable will be complex. Polydentate ligands form more stable complex than unidentate ligand. If multidentate ligand is cyclic, it further increases the stability, it is called macrocyclic effect.
Why chelate complexes are more stable?
Solution : Chelating complex is more stable than unchelated complex because the ligand is attached to the metal ion from many points. Thus, there is a strong force of attraction between the metal and the ligand.
What is meant by stability of complex?
The stability of a complex in solution refers to the degree of association between the two species involved in the state of equilibrium. The magnitude of the (stability or formation) equilibrium constant for the association, quantitatively express the stability. The complex formation is a Lewis acid-base concept. K = M.
What do you mean by stability of a complex ion?
The stability of a complex in solution means the degree of association between the metal ion and the ligands involved in the state of equilibrium.
What determines the stability of molecules?
The stability of atoms depends on whether or not their outer-most shell is filled with electrons. If the outer shell is filled, the atom is stable. Atoms with unfilled outer shells are unstable, and will usually form chemical bonds with other atoms to achieve stability.
Are smaller molecules more stable?
No, it’s actually the other way around, the larger the value of the bond order, the more stable the bond. Bond order is calculated by using the number of electrons that reside in bonding orbitals and in antibonding orbitals.
Which compound is more stable?
Therefore, Ph3C+ is most stable due to presence of three benzene rings which are resonance stabilised.