title: Naphthobipyrrole-derived sapphyrins: rational synthesis, characterization, nonlinear optical properties, and excited-state dynamics.
abstract: Two new free-base β-octa and hexaalkyl naphthobipyrrole-derived sapphyrins are reported along with various salts thereof. One of them has substituents at all of its β positions, whereas the pyrrole unit opposite to the bipyrrolic moiety is unsubstituted in the other. The effect of bipyrrole fusion on the structure of sapphyrins was explored. Interestingly, an unprecedented sandwiched supramolecular aqua-bridged free-base sapphyrin dimer was also characterized in the solid state. Further, the effect of anions on the third-order nonlinear optical properties of these sapphyrins were explored in the salt form, along with their detailed excited-state dynamics by both degenerate and nondegenerate pump-probe studies.
authors.affiliation: School of Chemistry, University of Hyderabad, Hyderabad-500 046, Andhra Pradesh (India), Fax: (+91)-40-2301-2460.
authors.forename: Tridib
authors.initials: T
authors.lastname: Sarma
authors.forename: Puliparambil Thilakan
authors.initials: PT
authors.lastname: Anusha
authors.forename: Ashok
authors.initials: A
authors.lastname: Pabbathi
authors.forename: Soma
authors.initials: S
authors.lastname: Venugopal Rao
authors.forename: Pradeepta K
authors.initials: PK
authors.lastname: Panda
keywords: excited-state dynamics; expanded porphyrins; nonlinear optics; porphyrinoids; sapphyrins