[en] In the present work, a novel tripodal diglycolamide extractant with three DGA arms tethered to a 9-membered macrocycle ring named as triaza-cyclononane-tripodal DGA or TCN-TDGA was synthesized and evaluated for the extraction of actinide (Pu⁴⁺, UO₂²⁺, Am³⁺) and lanthanide (Eu³⁺) ions from HNO₃ solutions. The order of extraction was found to be Eu³⁺>Pu⁴⁺>Am³⁺>>UO₂²⁺ at 3 M HNO₃. A solution containing 1.0x10^-3 M ligand in a mixture of 5% iso-decanol + 95% n-dodecane resulted in a very high extraction of Eu³⁺ and Am³⁺, the D values being 94.5 and 40.7, respectively from 3 M HNO₃. The extraction profiles of both the metal ions as a function of HNO₃ concentrations conformed to a solvation mechanism. The ligand concentration variation studies suggested extracted species of the type, ML₂. The nature of the complex was also investigated by emission spectroscopy using the Eu³⁺ complex in MeOH which suggested species with one inner-sphere water molecule. DFT calculations suggested that the higher extraction of Eu³⁺ as compared to that of Am³⁺ was due to the bonding through only the DGA arms and not involvement of the ‘N’ atoms of the aza-crown ring