Anion-induced two stable isostructural Cd(II) LMOFs based on benzotriazole with the highly selective detection of Fe3+ ions.

Two new LMOFs, [Cd9(BTA)6(5-tbuip)6O2]n (LMOF-1) and [Cd3(BTA)2(5-tbuip)2]n (LMOF-2) (BTA = 1H-benzotriazole, 5-tbuip = 5-tert-butylisophthalic acid), have been synthesized by a solvothermal method. The different anions of cadmium salts lead to two isostructural LMOFs. Fe3+ could be detected by LMOF-1 with N-rich sites, which possessed a high quenching coefficient (Ksv) of up to 1.87 × 105 M−1. The Ksv value for the detection of Fe3+ is better than or comparable to those reported in the literature. Since LMOF-2 had a larger pore size compared to that of LMOF-1, it could detect Cr2O72− with a higher Ksv than LMOF-1. In addition, LMOF-1 is closer to white light, which means that it has potential application in white light-emitting diodes (WLEDs). [ABSTRACT FROM AUTHOR]