On the Interchange Ability of the N‐donor Position in the Rare Earth Coordination Polymers $^{1}_{\infty}\rm [Ln(Btz)_{3}(L)]$ , L = BtzH, Ph(NH 2 ) 2 , NH 3 , and Pyridine

Benzotriazolates of the rare earth elements form chain like coordination polymers of the formula $^{1}_{\infty}\rm [Ln(Btz)_{3}(L)]$ . An additional neutral ligand L saturates the coordination spheres of the trivalent lanthanide ions and, depending on the reaction conditions, can be a varying donor (L = BtzH, Ph(NH 2 ) 2 , NH 3 and Py). Reactions in the BtzH (1 H ‐benzotriazole) melt result in coordination of benzotriazole and its thermal decomposition products as L. We have now investigated if the site occupied by L can be exchanged with other N donor ligands. Pyridine can substitute BtzH, Ph(NH 2 ) 2 and NH 3 under solvothermal conditions giving the coordination polymer $^{1}_{\infty}\rm [Ln(Btz)_{3}(Py)]$ even for the biggest Ln III cation lanthanum without changing the overall strand structure. Chains proof to be the chemically favoured and stable structure fragment with the L position being the chemically variable site.