تسجيل الدخول

تسجيل

How Much? - Analysing with Complexes

المؤلف:  Geoffrey A. Lawrance

المصدر:  Introduction to Coordination Chemistry

الجزء والصفحة:  256

2026-04-01

218

Ho Much? - Analysing with Complexes

Complexation as we have seen already causes change in the properties of a metal ion. Where such a change is reflected in a property that varies linearly (or at least in a known manner) with respect to complex concentration, there is the makings of an analytical method. This may be applied to detection of the metal ion, or alternatively to the detection of a ligand species that binds the metal ion selectively. It may even be possible to have complexation as a sensor of another process or species that is 'switched on' by a changed noncovalent interaction tied to the complexation event (such as an ion-pairing interaction). The two ex- amples given here relate to changing luminescence intensity associated with complexation, but in principle any measurable process can be employed. Luminescence (fluorescence or phosphorescence) is a useful sensor, where it occurs in compounds as it provides usually high sensitivity due to low background 'noise' levels. This therefore permits detection of the luminescent species down to very low concentrations with instrumentation able to detect it widely available at reasonable cost.