Two-photon absorption properties of iron(II) and ruthenium(II) trischelate complexes of 2,2′:4,4″:4′,4‴-quaterpyridinium ligands

Benjamin J. Coe, Marek Samoc, Anna Samoc, Lingyun Zhu, Yuanping Yi, Zhigang Shuai

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A series of RuII or FeII trischelate complex salts containing N-methyl/aryl-2,2′:4,4″:4′,4‴- quaterpyridinium ligands that has previously been subjected to quadratic nonlinear optical studies (Coe, B. J. et al. J. Am. Chem. Soc. 2005, 127, 13399) has now been investigated for two-photon absorbing behavior. Z-scan measurements using a 750 nm laser afford reasonably large two-photon absorption (2PA) cross-sections σ2 of ca. 62-180 GM for the Ru II complexes, but only very weak 2PA is observed for the Fe II compounds. The excited-state and 2PA properties of the representative chromophore [RuII(Me2Qpy2+) 3]8+ (Me2Qpy2+ = N″,N‴-dimethy]-2,2′:4,4″:4′,4‴- quaterpyridinium) have also been investigated by using semiempirical intermediate neglect of differential overlap/multireference-determinant single and double configuration interaction computations with the optimized geometry obtained via density functional theory. The calculated σ2 value of ca. 624 GM at 1.70 eV for this metal-to-ligand charge-transfer chromophore is about 10 times larger than that obtained from the Z-scan studies. © 2007 American Chemical Society.
    Original languageEnglish
    Pages (from-to)472-478
    Number of pages6
    JournalJournal of Physical Chemistry A
    Volume111
    Issue number3
    DOIs
    Publication statusPublished - 25 Jan 2007

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