title: Phosphorescence quantum yield enhanced by intermolecular hydrogen bonds in Cu4I4 clusters in the solid state.
abstract: Organo-copper(i) halide complexes with a Cu4I4 cubane core and cyclic amines as ligands have been synthesized and their crystal structures have been defined. Their solid state photophysical properties have been measured and correlated with the crystal structure and packing. A unique and remarkably high luminescence quantum yield (76%) has been measured for one of the complexes having the cubane clusters arranged in a columnar structure and held together by N-HI hydrogen bonds. This high luminescence quantum yield is correlated with a slow radiationless deactivation rate of the excited state and suggests a rather strong enhancement of the cubane core rigidity bestowed by the hydrogen bond pattern. Some preliminary thin film deposition experiments show that these compounds could be considered to be good candidates for applications in electroluminescent devices because of their bright luminescence, low cost and relatively easy synthesis processes.
authors.affiliation: Dipartimento di Chimica "G.Ciamician", Università di Bologna, Via Selmi 2, 40126 Bologna, Italy. l.maini@unibo.it.
authors.forename: Paolo P
authors.initials: PP
authors.lastname: Mazzeo
authors.forename: Lucia
authors.initials: L
authors.lastname: Maini
authors.forename: Alex
authors.initials: A
authors.lastname: Petrolati
authors.forename: Valeria
authors.initials: V
authors.lastname: Fattori
authors.forename: Kenneth
authors.initials: K
authors.lastname: Shankland
authors.forename: Dario
authors.initials: D
authors.lastname: Braga
mesh_terms: D000588:Amines / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D007454:Iodides / Q000737:chemistry*; D049449:Luminescence; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D011789:Quantum Theory
chemical_list: D000588:Amines; D007454:Iodides; D009942:Organometallic Compounds; D003300:Copper