Two chiral EuIII and SmIII enantiomeric pairs with enantiopure N-donor ligands: showing strong third-harmonic generation and photoluminescence properties†

IF 2.6 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

CrystEngComm Pub Date : 2024-11-01 DOI:10.1039/D4CE01052C

Jinliang Zhang, Zhiqiang Zhang, Congli Gao and Xi-Li Li

{"title":"Two chiral EuIII and SmIII enantiomeric pairs with enantiopure N-donor ligands: showing strong third-harmonic generation and photoluminescence properties†","authors":"Jinliang Zhang, Zhiqiang Zhang, Congli Gao and Xi-Li Li","doi":"10.1039/D4CE01052C","DOIUrl":null,"url":null,"abstract":"The reaction of the precursors Eu(dbm)3(H2O) and Sm(dbm)3(H2O) with enantiopure monobidentate N-donor ligands (LR/LS), respectively, afforded two chiral EuIII and SmIII enantiomeric pairs, namely Ln(dbm)3(LR)/Ln(dbm)3(LS) (Ln = EuIII, D-1/L-1 and Ln = SmIII, D-2/L-2), where dbm− = dibenzoylmethanate and LR/LS = (−)/(+)-4,5-pinenepyridyl-2-pyrazine. Compared with their precursors, D-1 and D-2 display highly enhanced photophysical properties under excitation with visible light. A study of nonlinear optical (NLO) response reveals that Eu(dbm)3(H2O) and Sm(dbm)3(H2O) only show moderate second-harmonic generation (SHG) responses, while D-1/L-1 and D-2/L-2 only exhibit strong third-harmonic generation (THG) responses. The THG intensities of D-1/L-1 and D-2/L-2 are 62/59 and 56/58 × α-SiO2, respectively. These findings clearly indicate that introducing LR and LS into Eu(dbm)3(H2O) and Sm(dbm)3(H2O) can not only highly boost the photophysical performances but also lead to the switching of the NLO responses from SHG to THG.","PeriodicalId":70,"journal":{"name":"CrystEngComm","volume":" 47","pages":" 6757-6764"},"PeriodicalIF":2.6000,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"CrystEngComm","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/ce/d4ce01052c","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

The reaction of the precursors Eu(dbm)₃(H₂O) and Sm(dbm)₃(H₂O) with enantiopure monobidentate N-donor ligands (L_R/L_S), respectively, afforded two chiral Eu^III and Sm^III enantiomeric pairs, namely Ln(dbm)₃(L_R)/Ln(dbm)₃(L_S) (Ln = Eu^III, D-1/L-1 and Ln = Sm^III, D-2/L-2), where dbm⁻ = dibenzoylmethanate and L_R/L_S = (−)/(+)-4,5-pinenepyridyl-2-pyrazine. Compared with their precursors, D-1 and D-2 display highly enhanced photophysical properties under excitation with visible light. A study of nonlinear optical (NLO) response reveals that Eu(dbm)₃(H₂O) and Sm(dbm)₃(H₂O) only show moderate second-harmonic generation (SHG) responses, while D-1/L-1 and D-2/L-2 only exhibit strong third-harmonic generation (THG) responses. The THG intensities of D-1/L-1 and D-2/L-2 are 62/59 and 56/58 × α-SiO₂, respectively. These findings clearly indicate that introducing L_R and L_S into Eu(dbm)₃(H₂O) and Sm(dbm)₃(H₂O) can not only highly boost the photophysical performances but also lead to the switching of the NLO responses from SHG to THG.