title: Enantiomerically pure lanthanide-organic polytungstates exhibiting two-photon absorption properties.
abstract: Two enantiomerically pure polytungstates, Na2[(CH3)2NH2]3{Na⊂[Ce(III)(H2O)(CH3CH2OH)(L-tartH3)(H2Si2W19O66)]}·3.5H2O (L-1) and [(CH3)2NH2]7{Na⊂[Ce(III)(H2O)(CH3CH2OH)(D-tartH3)(Si2W19O66)]}·2.5H2O (D-1), were successfully synthesized. Structural analysis indicates that chiral tartrate ligands directly connect with novel lacunary [Si2W19O66](10-) polytungstate units. Strong induced optical activity in the polyoxometalate (POM) units is manifested by circular dichroism spectroscopy. Z-scan analysis revealed that L-1 and D-1 are the first chiral POM-based complexes that exhibit two-photon absorption properties typical of the third-order nonlinear optical response.
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-oriented Chemical Engineering, Nanjing Tech University , Nanjing, 210009, People's Republic of China.
authors.forename: Wei-Wei
authors.initials: WW
authors.lastname: Ju
authors.forename: Hai-Tao
authors.initials: HT
authors.lastname: Zhang
authors.forename: Xiao
authors.initials: X
authors.lastname: Xu
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
mesh_terms: D002942:Circular Dichroism; D028581:Lanthanoid Series Elements / Q000737:chemistry* / Q000302:isolation & purification; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry; D013237:Stereoisomerism; D017973:Tungsten Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D000099294:Polyoxometalates
chemical_list: D028581:Lanthanoid Series Elements; D009942:Organometallic Compounds; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates