Quercetin, belonging to the group of common dietary flavonoid that occur ubiquitously in plant kingdom, has been shown to have biological activities such as antioxidant, antibacterial, anti-inflammatory, anti-mutagenic, antiviral, anti-allergic, antineoplastic, antithrombotic et al., The reaction between metal ions and quercetin has not been known too much. In this paper Quercetin-Cr(III) complex was synthesized and characterized, and its free radical ( ? OH、? O_2~- DPPH ?) scavenging activities , the bindi...