One Luminescent Cadmium Iodide with Free Bifunctional Azole Sites as a Triple Sensor for Cu, Fe, and CrO Ions.

The exploration of an excellent triple sensor for monitoring Cu, Fe, and CrO ions is of exceeding significance because of their serious effects on the human body. Herein, optically active 1H-3,5-bis(pyrazinyl)-1,2,4-triazole (Hbpt) with triazolyl and pyrazinyl groups was applied for the construction of a new type of organic hybrid cadmium iodide [CdI(bpt)(HO)]·2HO () incorporating a hitherto-unknown [CdI(HO)] trimeric-cationic unit, which shows an orange light emission at 589 nm with a large Stokes shift of 246 nm. In virtue of the existence of free bifunctional azole sites as the receptors, exhibits a highly selective and sensitive sensing property toward Cu, Fe, and CrO ions in aqueous solution with lower detection limits of 0.70∼4.46 ppm, which offers the sole example of cadmium iodide as an excellent triple sensor for detecting Cu, Fe, and CrO ions. Moreover, temperature-dependent luminescent determinations also reveal that can be used as the potential luminescent molecular thermometer.