title: Luminescent Zn and Pd tetranaphthaloporphyrins.
abstract: Zn and Pd complexes of meso-tetraphenyltetranaphthaloporphyrins (Ph(4)TNP) exhibit strong infrared absorption bands and luminesce in solutions at room temperature. S1 --> S0 fluorescence (lambda(max) = 732 nm, phi = 5.3%) is the predominant emission in the case of ZnPh(4)TNP (1). This emission is in part due to the delayed fluorescence (phi = 1.1%). Phosphorescence (T1 --> S0) of 1 (lambda(max) = 973 nm) is very weak (phi = 0.04%) and occurs with lifetime of about 440 micros in deoxygenated DMF. In the case of PdPh(4)TNP (2), almost no S1 --> S0 fluorescence could be observed, while the main emission detected was T1 --> S0 phosphorescence (lambda(max) = 938 nm). The phosphorescence of 2 occurs with lifetime of about 65 micros and (phi=6.5%) in deoxygenated DMF solution. Metalloporphyrins 1 and 2 are promising near infrared dyes biomedical applications.
authors.affiliation: Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Rozhkov
authors.forename: Mazdak
authors.initials: M
authors.lastname: Khajehpour
authors.forename: Sergei A
authors.initials: SA
authors.lastname: Vinogradov
mesh_terms: D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D007202:Indicators and Reagents; D007259:Infrared Rays; D049449:Luminescence; D008665:Metalloporphyrins / Q000737:chemistry*; D008958:Models, Molecular; D010777:Photochemistry
chemical_list: D005456:Fluorescent Dyes; D007202:Indicators and Reagents; D008665:Metalloporphyrins