Describe briefly the isomerism shown by [Cr(H$_2$O)$_5$(NCS)]$^{2+}$.

CBSE Class 12 · 2003 · All India Compartment · Coordination CompoundsVery Short Answer

Describe briefly the isomerism shown by [Cr(H

_{2}

_{5}

(NCS)]

^{2 +}

Answer: Linkage isomerism — NCS⁻ is ambidentate (binds via N or S): [Cr(H₂O)₅(NCS)]²⁺ and [Cr(H₂O)₅(SCN)]²⁺.

Thiocyanate is an ambidentate ligand with two possible donor atoms, N and S.
Binding through N gives [Cr(H

_{2}

_{5}

(NCS)]

^{2 +}

; binding through S gives the linkage isomer [Cr(H

_{2}

_{5}

(SCN)]

^{2 +}

.
This is linkage isomerism.

CBSE Class 12 Board · 2003 · All India Compartment · Subjective