TY - JOUR
T1 - Structural and photophysical properties of [(CO)3(phen)Re(μ-Br)Re(phen)(CO)3]+[(CO)3Re(μ-Br)3Re(CO)3]-
T2 - Where does its luminescence come from?
AU - Gallardo, Hector
AU - Cepeda-Plaza, Marjorie
AU - Nonell, Santi
AU - Günther, Germán
AU - Chamorro, Eduardo
AU - Pizarro, Nancy
AU - Vega, Andrés
N1 - Funding Information:
The authors gratefully acknowledge partial financial support of Dirección de Investigación Universidad Andres Bello, grant DI-111-12/R, Comision Nacional de Ciencia y Tecnología, grants FONDECYT 1120865 (AV) and 1140343 (EC) and ACE-03. AV is a member of Financiamiento Basal para Centros Científicos y Tecnológicos de Excelencia FB0807.
PY - 2015/6/12
Y1 - 2015/6/12
N2 - The multimetallic complex [[(CO)3(phen)Re(μ-Br)Re(phen)(CO)3][(CO)3Re(μ-Br)3Re(CO)3]]·CH2Cl2 was prepared by direct reaction of (Re(CO)3(THF)Br)2 (THF: tetrahydrofuran) and 1,10-phenanthroline in a 1:1 ratio, followed by recrystallization in dichloromethane. The compound is an ionic salt where both, cation and anion, are bimetallic complexes. Inside both of them the ReI centers are bridged by one or three bromides respectively. The compound has an absorption band centered at 375 nm in CH2Cl2, which has been assigned to a MLCT band. Excitation at 375 nm produces luminescent emission at 608 nm. Comparison of these results with closely related rhenium complexes, in addition to Time Dependant-DFT analysis, allow us to propose the [(CO)3(phen)Re(μ-Br)Re(phen)(CO)3]+ cation as main responsible for luminescence. Luminescence lifetime and singlet oxygen formation quantum yield suggest also that the emissive excited state has a triplet character.
AB - The multimetallic complex [[(CO)3(phen)Re(μ-Br)Re(phen)(CO)3][(CO)3Re(μ-Br)3Re(CO)3]]·CH2Cl2 was prepared by direct reaction of (Re(CO)3(THF)Br)2 (THF: tetrahydrofuran) and 1,10-phenanthroline in a 1:1 ratio, followed by recrystallization in dichloromethane. The compound is an ionic salt where both, cation and anion, are bimetallic complexes. Inside both of them the ReI centers are bridged by one or three bromides respectively. The compound has an absorption band centered at 375 nm in CH2Cl2, which has been assigned to a MLCT band. Excitation at 375 nm produces luminescent emission at 608 nm. Comparison of these results with closely related rhenium complexes, in addition to Time Dependant-DFT analysis, allow us to propose the [(CO)3(phen)Re(μ-Br)Re(phen)(CO)3]+ cation as main responsible for luminescence. Luminescence lifetime and singlet oxygen formation quantum yield suggest also that the emissive excited state has a triplet character.
KW - Cation
KW - Crystal structure
KW - Luminescence
KW - Multimetallic complex
KW - Re
UR - http://www.scopus.com/inward/record.url?scp=84931264063&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2015.05.024
DO - 10.1016/j.poly.2015.05.024
M3 - Article
AN - SCOPUS:84931264063
SN - 0277-5387
VL - 97
SP - 227
EP - 233
JO - Polyhedron
JF - Polyhedron
ER -