The ligands which have two or more donor atoms but in forming complexes, only one donor atom is attached to metal ion at a time, known as ambidentate ligands.
$ M\xleftarrow[{}]{{}}\underset{Thiocyanato}{\mathop{SCN}}\, $ $ M\xleftarrow[{}]{{}}\underset{Isothiocyanato}{\mathop{NCS}}\, $