title: New structural motifs, unusual quenching of the emission, and second harmonic generation of copper(I) iodide polymeric or oligomeric adducts with para-substituted pyridines or trans-stilbazoles.
abstract: The structural, emissive, and nonlinear optical properties of new CuI adducts with para-substituted trans-stilbazolic and pyridinic ligands are reported. Single-crystal X-ray diffraction results indicate that the para-substituent on the organic ligand greatly influences the structural motif by its steric (tert-butyl), electronic/steric (dimethylamino), or bridging-donor (cyano) properties so that two absolutely new structural motifs, polymeric and oligomeric, are found when trans-stilbazole and pyridine carry a dimethylamino group in the para-position. In addition, a surprising photoemission behavior is observed, being the solid-state emission of [CuI(trans-4-stilbazole)]n, [CuI(trans-4'-(dimethylamino)-4-stilbazole)]n, and [CuI(4'-tert-butyl-4-stilbazole)]n totally quenched. In the case of the noncentrosymmetric CuI adduct of trans-4'-(dimethylamino)stilbazole a discrete second harmonic generation (SHG) occurs.
authors.affiliation: Dipartimento di Chimica Inorganica Metallorganica e Analitica, Università degli Studi di Milano, Centro di Eccellenza CIMAINA, UdR di Milano dell'INSTM and Istituto di Scienze e Tecnologie Molecolari del CNR (ISTM-CNR), Milano, Italy.
authors.forename: Elena
authors.initials: E
authors.lastname: Cariati
authors.forename: Dominique
authors.initials: D
authors.lastname: Roberto
authors.forename: Renato
authors.initials: R
authors.lastname: Ugo
authors.forename: Peter C
authors.initials: PC
authors.lastname: Ford
authors.forename: Simona
authors.initials: S
authors.lastname: Galli
authors.forename: Angelo
authors.initials: A
authors.lastname: Sironi