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Cyanate, thiocyanate etc... ligands


 

(b) Cyanate, thiocyanate and selenocyanate ligands

In addition to identifying the type of functional groups present, IR can also be used to distinguish between different types of bonding, such as complexes containing SCN- or NO2- ligands.

SCN- can bind to the metal via either the S or N atoms, and the different coordination modes give rise to different characteristic IR frequencies.

M-SCN    M-NCS
thiocyanato
 isothiocyanato
vCN  ca. 2100 cm-1
>
ca. 2050 cm-1
vCS 720-690 cm-1
<
860-780 cm-1

 

vCN

vCS

[Zn-(NCS)4]-2

2074 cm-1

832 cm-1

[Hg-(SCN)4]-2

 2134 cm-1

716 cm-1

 

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