Ambidentate ligands: These type of ligands have two or more donor atoms out of which, only one donor atom is attached to metal in the complex. NO−2 group has two donor atoms N and O out of which, only one donor atom is attached to metal in the complex such as M−NO2 or M−ONO. SCN− group has two donor atoms N and S out of which, only one donor atom is attached to metal in the complex such as M−SCN or M−NCS. CN− group has two donor atoms N and C out of which, only one donor atom is attached to metal in the complex such as M−CN or M−NC.