What kind of isomerism exists between [Cr(H2O)6]Cl3 (violet) and [Cr(H2O)5Cl]Cl2.H2O (greyish-green)?
A. linkage isomerism
B. solvate isomerism
C. ionisation isomerism
D. coordination isomerism
The number of water molecules inside and outside the coordination complex differs. So, it has to be solvate isomerism. Solvate isomers tell us if the solvent is attached to the central atom or is outside the coordination sphere and free.
Ligands that have two different bonding sites are called ambident ligands. Few examples are SCN-,NO2 etc…
SCN-→ Metal or NCS→Metal
So, [Pd(C6H5)2(SCN)2] and [Pd(C6H5)2(NCS)2] are linkage isomers because they differ in the binding site of the ligands which leads to different linkage.
Whereas, a coordination isomer is a form of structural isomerism in which the composition of the complexion varies. In a coordination isomer the total ratio of ligand to metal remains the same, but the ligands attached to a specific metal ion change.
For Example: A solution containing ([Co(NH3)6]3+) and [Cr(CN)6]3- is a coordination isomer with a solution containing ([Cr(NH3)6] and [Co(CN)6]).
Ionisation Isomers: These are identical except for a ligand has exchanged places with an anion or neutral molecule that was originally outside the coordination complex. The central ion and the other ligands are identical.
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When a co-ordination compound is mixed with moles of are precipitated per mole of the compound. Write
A. Structural formula of the complex.
B. IUPAC name of the complex.Chemistry - Board Papers
CoSO4Cl.5NH3 exists in two isomeric forms ‘A’ and ‘B’. Isomer ‘A’ reacts withAgNO3 to give white precipitate but does not react with BaCl2. Isomer ‘B’ gives a white precipitate with BaCl2 but does not react with AgNO3. Answer the following questions.
(i) Identify ‘A’ and ‘B’ and write their structural formulas.
(ii) Name the type of isomerism involved.
(iii) Give the IUPAC name of ‘A’ and ‘B’.
Chemistry - Exemplar
Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.
Assertion: Linkage isomerism arises in coordination compounds containing ambidentate ligand.
Reason: Ambidentate ligand has two different donor atoms.
Chemistry - Exemplar