title: Infra-red spectroscopic characteristics of naphthalocyanine in bis(naphthalocyaninato) rare earth complexes peripherally substituted with thiophenyl derivatives.
abstract: The infra-red (IR) spectroscopic data for a series of eleven rare earth double-deckers MIII[Nc(SPh)8]2 (M=Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Er) have been collected and systematically investigated. For MIII[Nc(SPh)8]2, typical IR marker bands for the naphthalocyanine anion radical [Nc(SPh)8].- were observed at 1317-1325 cm(-1) as the most intense absorption bands, which can be attributed to the pyrrole stretching. As for Ce[Nc(SPh)8]2, the typical IR marker band was also observed at 1317 cm(-1), which shows that the cerium complex exists as the form of CeIII[Nc(SPh)8]2-[Nc(SPh)8].-. In addition, both the Q-bands of electronic absorption spectra and the typical IR absorption bands of naphthalocyanine radical anion [Nc(SPh)8].- move to the high energy as the decrease of rare earth metal ionic radius. These facts suggest that the π-π electron interaction in these double-deckers becomes stronger along with the lanthanide contraction.
authors.affiliation: Department of Chemistry, School of Sciences, Tianjin University, Tianjin 300072, PR China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Chemistry, School of Sciences, Tianjin University, Tianjin 300072, PR China.
authors.forename: Yajun
authors.initials: Y
authors.lastname: Mao
authors.affiliation: Department of Chemistry, School of Sciences, Tianjin University, Tianjin 300072, PR China.
authors.forename: Chi
authors.initials: C
authors.lastname: Xiao
authors.affiliation: Department of Chemistry, School of Sciences, Tianjin University, Tianjin 300072, PR China. Electronic address: fanlilu@tju.edu.cn.
authors.forename: Fanli
authors.initials: F
authors.lastname: Lu
mesh_terms: D056831:Coordination Complexes / Q000737:chemistry*; D004583:Electrons; D008674:Metals, Rare Earth / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D056831:Coordination Complexes; D008674:Metals, Rare Earth; D011166:Porphyrins; D011758:Pyrroles; C076388:2,3-naphthalocyanine
keywords: Double-decker; IR spectra; Naphthalocyanine; Rare earth; UV–vis spectra