金屬錯合物的發射光譜顯示三種金屬為Cr(III)、Fe(III)、Au(III)有相同的放光行為，經加入KI後，將突顯Cr(III)放光行為且化學螢光感測對Cr(III)具有專一性。這些錯合物的特異性，將在本論文仔細探討及研究。 A series of new bis(1,10-Phenanthrolin-2-yl)amine (HDPA) derivatives have been synthesized (L1 = NpDPA、L2 = EtDPA、L3 = AlDPA). The L1 incorporate a naphthalenylmethylene group on the bridge nitrogen atom of HDPA as a new fluorophore. This study focused on the specific luminescence properties of L1. The UV-Vis spectra of L1 as a function of pH gave acidity constants of H2NpDPA2+ (pKa1 = 2.93) and HNpDPA+ (pKa2 = 4.79). Coordination of L1 with iron(III) nitrate yielded the corresponding [Fe2O(NpDPA)2(H2O)2](NO3)4 complex 2. The x-ray crystallography revealed the oxo-bridged dinuclear structure of complex 2. The Fe-O-Fe bridges have been reported to exhibit electronic transition at 320-325 nm and 360-380 nm which was assigned to charge transfer absorption. The fluorescence at lower energy wavelength 547 nm (ex = 370nm) was observed. This emission was attributed to an Oxo→Fe(III) charge transfer states. The Cr(III) ion exhibited similar spectroscopic properties as the Fe(III) complex 2. The photophysical studies concluded that the luminescence quenching in the L1 is due to the photo-induced electron transfer (PET) from the naphthalenylmethylene group, which is an electron releasing group that increased the internal charge transfer (ICT) resulting from the bridged nitrogen atom to phenanthroline. The specific fluorescence of L1 at 547 nm when associated with Cr(III) and Fe(III) ions shows selective metal ion sensing ability. The emission was sensitive with Cr(III) with no or weak interference by other cations.
