title: Solid-state emission enhancement in vaulted trans-bis(salicylaldiminato)platinum(II) crystals with halogen functionality.
abstract: The synthesis, structure, and solid-state emission of vaulted trans-bis(salicylaldiminato)platinum(ii) complexes 1-3 with halogen functionalities are described and compared with the non-substituted analogues. Chloro-substitution provided an improvement of the low emission properties of short-vaulted, non-substituted complexes 1 and 2 in the crystalline state at ambient temperature, while the intense emission of long-vaulted analogues 3 remained unchanged. Bromo-substituted crystals also emit intensively, while the fluoro analogue is non-emissive under the same conditions. Temperature-dependent emission spectra indicate that all chloro- and bromo-substituted crystals with enhanced emission properties at ambient temperature exhibit improved heat resistance properties towards emission decay with the halogen functionalities. X-ray diffraction studies revealed that such a positive effect of halogenation for the enhancement of solid-state emission is due to significant molecular constraints in the crystals by a combination of the vaulted structure and three-dimensional HX hydrogen bonding interactions.
authors.affiliation: Department of Chemistry, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560-8531, Japan. naota@chem.es.osaka-u.ac.jp.
authors.forename: Naruyoshi
authors.initials: N
authors.lastname: Komiya
authors.forename: Minoru
authors.initials: M
authors.lastname: Okada
authors.forename: Kanako
authors.initials: K
authors.lastname: Fukumoto
authors.forename: Shotaro
authors.initials: S
authors.lastname: Iwata
authors.forename: Takeshi
authors.initials: T
authors.lastname: Naota