Switching from intramolecular energy transfer to intramolecular electron transfer by the action of pH and Zn2+ co-ordination

M. Teresa Albelda; Pilar Díaz; Enrique García-España; João C. Lima; Carlos Lodeiro; J. Seixas de Melo; A. Jorge Parola; Fernando Pina; Concepción Soriano

doi:10.1016/S0009-2614(01)01414-2

Switching from intramolecular energy transfer to intramolecular electron transfer by the action of pH and Zn²⁺ co-ordination

M. Teresa Albelda, Pilar Díaz, Enrique García-España, João C. Lima, Carlos Lodeiro, J. Seixas de Melo, A. Jorge Parola, Fernando Pina, Concepción Soriano

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

Intramolecular electron (eT) and energy transfer (ET) have shown to occur in a covalently linked donor-acceptor (CLDA) system consisting of a naphthalene donor covalently linked through a polyamine chain connector to an anthracene acceptor; the connector has been chosen in order to switch ON or OFF the energy flux as a function of its protonation state as well as by co-ordination to Zn²⁺. The largest energy transfer efficiency (η = 0.61) occurs for the fully protonated form (pH < 2), while at pH > 9 (eT) from the lone pairs of the nitrogens to the excited fluorophore takes place, leading to complete quenching of the emission. On the other hand at neutral and basic pH values, coordination of Zn²⁺ prevents the eT quenching allowing the ET process to occur.

Original language	English
Pages (from-to)	63-68
Number of pages	6
Journal	Chemical Physics Letters
Volume	353
Issue number	1-2
DOIs	https://doi.org/10.1016/S0009-2614(01)01414-2
Publication status	Published - 13 Feb 2002

Keywords

Molecules
Ligands
Stability constants

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10.1016/S0009-2614(01)01414-2Licence: CC BY-NC-ND

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@article{32dee4aec76a4c5d8106ce39e78c0af6,

title = "Switching from intramolecular energy transfer to intramolecular electron transfer by the action of pH and Zn2+ co-ordination",

abstract = "Intramolecular electron (eT) and energy transfer (ET) have shown to occur in a covalently linked donor-acceptor (CLDA) system consisting of a naphthalene donor covalently linked through a polyamine chain connector to an anthracene acceptor; the connector has been chosen in order to switch ON or OFF the energy flux as a function of its protonation state as well as by co-ordination to Zn2+. The largest energy transfer efficiency (η = 0.61) occurs for the fully protonated form (pH < 2), while at pH > 9 (eT) from the lone pairs of the nitrogens to the excited fluorophore takes place, leading to complete quenching of the emission. On the other hand at neutral and basic pH values, coordination of Zn2+ prevents the eT quenching allowing the ET process to occur.",

keywords = "Molecules, Ligands, Stability constants",

author = "{Teresa Albelda}, M. and Pilar D{\'i}az and Enrique Garc{\'i}a-Espa{\~n}a and Lima, {Jo{\~a}o C.} and Carlos Lodeiro and Melo, {J. Seixas de} and {Jorge Parola}, A. and Fernando Pina and Concepci{\'o}n Soriano",

note = "Financial support from FCT project. 32442/99 (Portugal), PRAXIS/QUI/10137/98, HPRN-CT-2000-29 (EC), and DGICYT project BQU2000-1424 (Spain) are gratefully acknowledged. M.T.A. and P.D. want to thank Generalitat Valenciana and Ministerio de Ciencia y Tecnolog{\'ı}a for their respective PhD grants.",

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doi = "10.1016/S0009-2614(01)01414-2",

language = "English",

volume = "353",

pages = "63--68",

journal = "Chemical Physics Letters",

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T1 - Switching from intramolecular energy transfer to intramolecular electron transfer by the action of pH and Zn2+ co-ordination

AU - Teresa Albelda, M.

AU - Díaz, Pilar

AU - García-España, Enrique

AU - Lima, João C.

AU - Lodeiro, Carlos

AU - Melo, J. Seixas de

AU - Jorge Parola, A.

AU - Pina, Fernando

AU - Soriano, Concepción

N1 - Financial support from FCT project. 32442/99 (Portugal), PRAXIS/QUI/10137/98, HPRN-CT-2000-29 (EC), and DGICYT project BQU2000-1424 (Spain) are gratefully acknowledged. M.T.A. and P.D. want to thank Generalitat Valenciana and Ministerio de Ciencia y Tecnologı́a for their respective PhD grants.

PY - 2002/2/13

Y1 - 2002/2/13

N2 - Intramolecular electron (eT) and energy transfer (ET) have shown to occur in a covalently linked donor-acceptor (CLDA) system consisting of a naphthalene donor covalently linked through a polyamine chain connector to an anthracene acceptor; the connector has been chosen in order to switch ON or OFF the energy flux as a function of its protonation state as well as by co-ordination to Zn2+. The largest energy transfer efficiency (η = 0.61) occurs for the fully protonated form (pH < 2), while at pH > 9 (eT) from the lone pairs of the nitrogens to the excited fluorophore takes place, leading to complete quenching of the emission. On the other hand at neutral and basic pH values, coordination of Zn2+ prevents the eT quenching allowing the ET process to occur.

AB - Intramolecular electron (eT) and energy transfer (ET) have shown to occur in a covalently linked donor-acceptor (CLDA) system consisting of a naphthalene donor covalently linked through a polyamine chain connector to an anthracene acceptor; the connector has been chosen in order to switch ON or OFF the energy flux as a function of its protonation state as well as by co-ordination to Zn2+. The largest energy transfer efficiency (η = 0.61) occurs for the fully protonated form (pH < 2), while at pH > 9 (eT) from the lone pairs of the nitrogens to the excited fluorophore takes place, leading to complete quenching of the emission. On the other hand at neutral and basic pH values, coordination of Zn2+ prevents the eT quenching allowing the ET process to occur.

KW - Molecules

KW - Ligands

KW - Stability constants

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DO - 10.1016/S0009-2614(01)01414-2

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AN - SCOPUS:0037070120

SN - 0009-2614

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JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 1-2

ER -

Switching from intramolecular energy transfer to intramolecular electron transfer by the action of pH and Zn²⁺ co-ordination

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Keywords

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