Synthesis and third-order optical nonlinearities of nickel complexes of 8-hydroxyquinoline derivatives |
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| Authors: | Yan Qian Minmin Cai Yuanping Yi Guoqiang Yang |
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| Institution: | a Jiangsu Key Lab for Organic Electronics and Information Displays and Institute of Advanced Materials (IAM), Nanjing University of Posts and Telecommunications (NUPT), 9 Wenyuan Road, Nanjing 210046, China
b Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry and Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | A nickel complex of 5-(acrylamido)methyl-8-hydroxyquinoline, bis-(5-(acrylamido)methyl-8-hydroxyquinolino) nickel(II) (Ni(AAMQ)2) has been synthesized and its third-order nonlinear optical properties was investigated with respect to that of bis-(8-hydroxyquinolino) nickel(II) (NiQ2) by single beam Z-scan technique. The real parts (γR) of the molecular second-order hyperpolarizabilities were −6.0 × 10−46 and −5.5 × 10−46 m5/v2 for NiQ2 and Ni(AAMQ)2, respectively, indicative of similar nonlinear refraction both in sign and in magnitude. After substitution of an acrylamidomethyl group to the 8-hydroxyquinoline (8-HQ) ligand, the nonlinear absorption coefficient of Ni(AAMQ)2 was enhanced by more than two times. The corresponding imaginary part (γI) of the molecular second-order hyperpolarizability was 3.4 × 10−46 m5/v2 for Ni(AAMQ)2 while 1.6 × 10−46 m5/v2 for NiQ2. The increase in nonlinear absorption was attributed to the substitution effect and the enhanced transition dipole moment due to the participation of δ-donor group of CH2 in the molecular conjugation. |
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| Keywords: | Third-order nonlinearity Z-scan technique Self-defocusing Two-photon absorption Nickel complex of 8-hydroxyquinoline |
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