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Mikata Y, Ohnishi R, Ugai A, et al. OFF-ON-OFF fluorescent response of N,N,N',N'-tetrakis(1-isoquinolylmethyl)-2-hydroxy-1,3-propanediamine (1-isoHTQHPN) toward Zn(2.). Dalton Trans. 2016;45(17):7250-7doi: 10.1039/c6dt00506c.
Mikata, Y., Ohnishi, R., Ugai, A., Konno, H., Nakata, Y., Hamagami, I., & Sato, S. (2016). OFF-ON-OFF fluorescent response of N,N,N',N'-tetrakis(1-isoquinolylmethyl)-2-hydroxy-1,3-propanediamine (1-isoHTQHPN) toward Zn(2.). Dalton transactions (Cambridge, England : 2003), 45(17), 7250-7. https://doi.org/10.1039/c6dt00506c
Mikata, Yuji, et al. "OFF-ON-OFF fluorescent response of N,N,N',N'-tetrakis(1-isoquinolylmethyl)-2-hydroxy-1,3-propanediamine (1-isoHTQHPN) toward Zn(2.)." Dalton transactions (Cambridge, England : 2003) vol. 45,17 (2016): 7250-7. doi: https://doi.org/10.1039/c6dt00506c
Mikata Y, Ohnishi R, Ugai A, Konno H, Nakata Y, Hamagami I, Sato S. OFF-ON-OFF fluorescent response of N,N,N',N'-tetrakis(1-isoquinolylmethyl)-2-hydroxy-1,3-propanediamine (1-isoHTQHPN) toward Zn(2.). Dalton Trans. 2016 Apr 25;45(17):7250-7. doi: 10.1039/c6dt00506c. PMID: 27007647.
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Dalton Trans. 2016 Apr 25;45(17):7250-7. doi: 10.1039/c6dt00506c.

OFF-ON-OFF fluorescent response of N,N,N',N'-tetrakis(1-isoquinolylmethyl)-2-hydroxy-1,3-propanediamine (1-isoHTQHPN) toward Zn(2.).

Dalton transactions (Cambridge, England : 2003)

Yuji Mikata, Risa Ohnishi, Anna Ugai, Hideo Konno, Yasushi Nakata, Ikuko Hamagami, Shin-Ichiro Sato

Affiliations

  1. Department of Chemistry, Biology, and Environmental Science, Faculty of Science, Nara Women's University, Nara 630-8506, Japan. [email protected] and KYOUSEI Science Center, Nara Women's University, Nara 630-8506, Japan and Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630-8506, Japan.
  2. Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630-8506, Japan.
  3. National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
  4. Horiba, Ltd, 2 Miyanohigashi, Kisshoin, Minami-ku, Kyoto 601-8510, Japan.
  5. Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan.

PMID: 27007647 DOI: 10.1039/c6dt00506c

Abstract

An isoquinoline-based ligand, N,N,N',N'-tetrakis(1-isoquinolylmethyl)-2-hydroxy-1,3-propanediamine (1-isoHTQHPN), exhibits a fluorescence increase at 475 nm upon addition of 1 equiv. of Zn(2+) (IZn/I0 = 12, ϕZn = 0.023). This fluorescence enhancement turns and then decreases sharply after the addition of more than 1 equiv. of Zn(2+) reaching a constant minimum intensity with more than 2 equiv. of Zn(2+). In contrast, the fluorescence intensity at 353 nm continues to increase until the signal saturates at ca. 5 equiv. of Zn(2+). This observation can be explained by the formation of a fluorescent mononuclear complex ([Zn(1-isoHTQHPN)](2+)) followed by a non-fluorescent dinuclear complex ([Zn2(1-isoTQHPN)](3+)) at 475 nm during the titration of 1-isoHTQHPN with Zn(2+). Both the mono- and dinuclear complexes were characterized by UV-vis, fluorescence, (1)H NMR, ESI-MS, X-ray crystallography and TDDFT calculations. The fluorescence enhancement at 475 nm is Zn(2+)-specific; Cd(2+) induces a much smaller emission increase (ICd/I0 = 3.7, ICd/IZn = 31%). The Zn(2+)/Cd(2+) selectivity of the fluorescent response correlates with the difference in excimer-forming ability derived from the Cd-Nisoquinoline and Zn-Nisoquinoline bond distances.

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