title: 3-{1-[2-(2-Chloro-phen-yl)hydrazinyl-idene]-2,2,2-trifluoro-eth-yl}-7-diethyl-amino-2H-chromen-2-one.
abstract: The title compound, C(21)H(19)ClF(3)N(3)O(2), has a structure related to other coumarin derivatives that have been used as fluorescent probes of metal ions. The dihedral angle between the coumarin ring system and the chlorobenzene ring is 42.99 (9)°. Intra-molecular hydrogen bonding occurs via N-H⋯O and N-H⋯Cl inter-actions, generating S(7) and S(5) rings, respectively. The crystal packing is stabilized by weak C-H⋯O hydrogen bonds.
authors: Key Laboratory of Science & Technology of Eco-Textiles, Ministry of Education, College of Chemistry, Chemical Engineering & Biotechnology, Donghua University, Shanghai 201620,  People's Republic of China.
authors: Hao
authors: H
authors: Chen
authors: Li
authors: L
authors: Cai
authors: Chaochao
authors: C
authors: Yu
authors: Hongqi
authors: H
authors: Li