What is FAC and Mer?

What is FAC and Mer?

When three identical ligands occupy one face, the isomer is said to be facial, or fac. If the three ligands and the metal ion are in one plane, the isomer is said to be meridional, or mer. Optical isomerism occurs when a molecule is not superimposable with its mirror image.

How do you identify FAC Mer isomers?

Instead of dealing with 2 ligands, mer-fac isomers deal with 3 ligands. If the 3 ligands are all on the same side, the isomer is called a fac-isomer. Another way to identify fac isomers is to look at the bond angle between the ligands because fac isomers have a 90o bond angle between each of the 3 atoms.

Which of the following octahedral complexes exhibits fac and mer isomerism?

For the formula, [MA3B3] there are three A ligands present on one side of the triangular face and three B ligands that are present on the opposite side of the triangular face. Thus, it exhibits both Fac and mer-isomers. And hence the correct option is D.

Are FAC and Mer geometric isomers?

Like organic molecules, transition metal complexes can form different isomers. These include geometric (cis/trans), optical as well as facial and meridional (fac/mer) isomers.

Are FAC Mer isomers optically active?

If we look closely at the mer-isomer, it has a plane of symmetry, so it is optically inactive. But the fac-isomer has no plane of symmetry.

Are FAC-Mer isomers optically active?

Are fac and mer isomers optically active?

Which one of the following will show FAC mer isomerism?

Complexes of the type MA3B3 exist in two geometrical forms which are named as facial (fac-) and meridonal (mer-isomers). [Co(NH3)3(NO2)3] may be represented in fac- and mer-isomeric forms as follows.

Which complex is optically active?

In [Fe(C2O4)3]3−, there are three ligands and each ligand is attached to the central atom by two atoms so it is octahedral complexes. It is optically active. In [Fe(en)2Cl2], there are four ligands, the two en ligand has four attachments to the iron atom so it is octahedral complex. It is optically active.

Do FAC and Mer show optical isomerism?

For ML a 3L b 3, two isomers are possible – a facial isomer (fac) where the three identical ligands are mutually cis, and a meridional isomer (mer) where the three ligands are coplanar. they show optical isomerism because they rotate plane of polarised light.

Which is a compound with a face sharing octahedral chain?

Compounds with face-sharing octahedral chains include MoBr 3, RuBr 3, and TlBr 3. Ball-and-stick model of niobium pentachloride, a bioctahedral coordination compound. Ball-and-stick model of zirconium tetrachloride, an inorganic polymer based on edge-sharing octahedra.

Why is the fac / mer ratio high in Fe complexes?

The complex displayed fac/mer isomerism.A high fac: mer ratio was observed due to lack of meridional isomers present in the NMR spectrum.

How many stereoisomers are possible in an octahedral complex?

Two enantiomeric chiral isomers in which all three pairs of identical ligands are cis. The number of possible isomers can reach 30 for an octahedral complex with six different ligands (in contrast, only two stereoisomers are possible for a tetrahedral complex with four different ligands).

When do three identical ligands occupy one face of an octahedron?

When three identical ligands occupy one face of an octahedron, the isomer is said to be facial, or fac. In a fac isomer, any two identical ligands are adjacent or cis to each other. If these three ligands and the metal ion are in one plane, the isomer is said to be meridional, or mer.

What is FAC and Mer? When three identical ligands occupy one face, the isomer is said to be facial, or fac. If the three ligands and the metal ion are in one plane, the isomer is said to be meridional, or mer. Optical isomerism occurs when a molecule is not superimposable with its mirror image.…