An Activatable NIR Yb4Zn2 Cluster for the Detection of Quercetin: Analysis of Host–Guest Interaction and Sensing Mechanism | Inorganic Chemistry pubs.acs.org/doi/10.1021/... Zhang, Li, and co-workers @InorgChem #ytterbium #zinc #NIR #quercetin #activatable #Yb4Zn2