The invention relates to compounds of formula I ##STR00001## wherein R.sup.1, R.sup.2, and R.sup.4 are independently at each occurrence a C.sub.1-C.sub.20 aliphatic radical, a C.sub.3-C.sub.20 aromatic radical, or a C.sub.3-C.sub.20 cycloaliphatic radical; R.sup.3 and R.sup.5 are independently at each occurrence hydrogen, a C.sub.1-C.sub.20 aliphatic radical, a C.sub.3-C.sub.20 aromatic radical, or a C.sub.3-C.sub.20 cycloaliphatic radical; and a, b and d are independently 0 or an integer ranging from 1 to 3.The invention further relates to polymers derived from compounds of formula I. The polymers may be polyesters, polyethers, polycarbonates, polyestercarbonates, polyetherketones, or polyethersulfones. Compounds and polymers of the invention find use in light emitting devices.