Crystal structure and physical properties of the new ternary compounds Nd3Pt23Si11 and Pr3Pt23Si11

► It is the first time that Pr3Pt23Si11 and Nd3Pt23Si11 have been synthesized. ► Structural refinement confirms that they crystallize in the same structure as Ce3Pt23Si11. ► We report on the first physical studies on these two new compounds.