Four new samarium(III) compounds based on different tetrazole–carboxylate ligands

Tetrazole–carboxylate ligands with both rigid tetrazole ring and flexible carboxylate group have a great potential in the construction of coordination architectures. Here, we report four new samarium(III) compounds based on four tetrazole–carboxylate ligands 5-(2-pyrimidyl)tetrazole-2-acetic acid (Hpmtza), 5-aminotetrazole-1-propanoic acid (Hatzpa), 5-(4-pyridyl)tetrazole-2-acetic acid (Hpytza), and 3,3-di(1H-tetrazol-5-yl)pentanedioic acid (H4dtzpda), namely mononuclear [Sm(pmtza)2(H2O)6]Cl·3H2O (1), binuclear [Sm2(atzpa)4(H2O)8](NO3)2·2H2O (2), one-dimensional [Sm(pytza)3(H2O)2]·2H2O (3) and [Sm(Hdtzpda)(H2O)4]·4H2O (4). The effect of different counter anion (ClO4 −, Cl−, NO3 −) on the formation of such compounds was also investigated. Furthermore, the luminescence of compounds 1–4 shows intraligand emission, whereas the characteristic peaks of Sm3+ may be overlapped.