A class of fluorescent rare earth chelates and the ligands upon which they are based whose molecular structure incorporates a plurality of substituted arylpyridine diacid units attached to a central template structure is disclosed. These ligands function as efficient energy transfer groups in fluorescent...http://www.google.co.uk/patents/US5055578?utm_source=gb-gplus-sharePatent US5055578 - Fluorescent poly(arylpyridine) rare earth chelates
