Columnar discotic Pt(II) metallomesogens as luminescence multifunctional materials with chemo and thermosensor abilities

Cristian Cuerva, Jose A. Campo, Paloma Ovejero, M. Rosario Torres, Elisabete Oliveira, Sergio M. Santos, Carlos Lodeiro, Mercedes Cano

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

A new family of Pt(II) luminescent metallomesogens based on dicatenar pyridylpyrazolate ligands [Pt(pzR(n,n)py)2](R(n,n) ¼ C6H3(OCnH2n+1)2, n ¼ 4–18) has been prepared, and their mesomorphic and photophysicalproperties are described. The compounds were isolated as red (n ¼ 4–8) or yellow (n ¼ 10–18) solids atroom temperature, but the first ones were converted to yellow crystals by slow evaporation of achloroform–acetone mixed solution. All of them behave as discotic liquid crystal materials, exhibitinghexagonal columnar mesophases (Colh) in a wide range of temperatures. Photoluminescence studies inthe solid state at variable temperatures showed a high emission in the liquid crystalline phase, which wassignificantly red-shifted with respect to the yellow-green emission of the solid state. This photophysicalchange was attributed to the formation of aggregates through Pt(dz2)–Pt(dz2) interactions, thereby givingrise to the metal–metal-to-ligand charge transfers (3MMLCT) responsible for the luminescenceobserved. Taking advantage of these properties we have fabricated polymeric solid supports doped withthe platinum complex [Pt(pzR(10,10)py)2], which can be used as temperature sensors for real technologicalapplications. In addition, the Pt–bispyrazolate complexes and their corresponding pyrazole ligands havebeen proved to be useful as chemosensors towards Pd2+, Zn2+, Cd2+ and Hg2+ metal ions.
Original languageEnglish
Pages (from-to)9167-9178
JournalJOURNAL OF MATERIALS CHEMISTRY C
Volume2
Issue number43
DOIs
Publication statusPublished - 21 Nov 2014

Fingerprint

Luminescence
Ligands
Liquid Crystals
Temperature sensors
Platinum
Temperature
Metal ions
Charge transfer
Photoluminescence
Evaporation
Crystalline materials
Crystals
Liquids

Keywords

  • Discotics
  • Metallomesogens
  • Multi-functional materials
  • Thermo-sensor

Cite this

Cuerva, Cristian ; Campo, Jose A. ; Ovejero, Paloma ; Rosario Torres, M. ; Oliveira, Elisabete ; Santos, Sergio M. ; Lodeiro, Carlos ; Cano, Mercedes. / Columnar discotic Pt(II) metallomesogens as luminescence multifunctional materials with chemo and thermosensor abilities. In: JOURNAL OF MATERIALS CHEMISTRY C. 2014 ; Vol. 2, No. 43. pp. 9167-9178.
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title = "Columnar discotic Pt(II) metallomesogens as luminescence multifunctional materials with chemo and thermosensor abilities",
abstract = "A new family of Pt(II) luminescent metallomesogens based on dicatenar pyridylpyrazolate ligands [Pt(pzR(n,n)py)2](R(n,n) ¼ C6H3(OCnH2n+1)2, n ¼ 4–18) has been prepared, and their mesomorphic and photophysicalproperties are described. The compounds were isolated as red (n ¼ 4–8) or yellow (n ¼ 10–18) solids atroom temperature, but the first ones were converted to yellow crystals by slow evaporation of achloroform–acetone mixed solution. All of them behave as discotic liquid crystal materials, exhibitinghexagonal columnar mesophases (Colh) in a wide range of temperatures. Photoluminescence studies inthe solid state at variable temperatures showed a high emission in the liquid crystalline phase, which wassignificantly red-shifted with respect to the yellow-green emission of the solid state. This photophysicalchange was attributed to the formation of aggregates through Pt(dz2)–Pt(dz2) interactions, thereby givingrise to the metal–metal-to-ligand charge transfers (3MMLCT) responsible for the luminescenceobserved. Taking advantage of these properties we have fabricated polymeric solid supports doped withthe platinum complex [Pt(pzR(10,10)py)2], which can be used as temperature sensors for real technologicalapplications. In addition, the Pt–bispyrazolate complexes and their corresponding pyrazole ligands havebeen proved to be useful as chemosensors towards Pd2+, Zn2+, Cd2+ and Hg2+ metal ions.",
keywords = "Discotics , Metallomesogens , Multi-functional materials , Thermo-sensor",
author = "Cristian Cuerva and Campo, {Jose A.} and Paloma Ovejero and {Rosario Torres}, M. and Elisabete Oliveira and Santos, {Sergio M.} and Carlos Lodeiro and Mercedes Cano",
note = "M. Cano is grateful to the Ministerio de Economia y Competitividad (Spain), project CTQ2011-25172. E. Oliveira acknowledges the post-doctoral grant from Fundacao para a Ciencia e a Tecnologia (Portugal) SFRH/BPD/72557/2010. PROTEOMASS Scientific Society (Portugal) and PROTEOMASS Scientific Society (Spain) are also acknowledged for funding. C. Lodeiro thanks REQUIMTE-FCT PEst-C/EQB/LA0006/2013 for funding. We would like to thank Prof. Guillermo Orellana and Dr Ana Bel en Descalzo for their contribution and help with the lifetime measurement.",
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Columnar discotic Pt(II) metallomesogens as luminescence multifunctional materials with chemo and thermosensor abilities. / Cuerva, Cristian; Campo, Jose A.; Ovejero, Paloma; Rosario Torres, M.; Oliveira, Elisabete; Santos, Sergio M.; Lodeiro, Carlos; Cano, Mercedes.

In: JOURNAL OF MATERIALS CHEMISTRY C, Vol. 2, No. 43, 21.11.2014, p. 9167-9178.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Columnar discotic Pt(II) metallomesogens as luminescence multifunctional materials with chemo and thermosensor abilities

AU - Cuerva, Cristian

AU - Campo, Jose A.

AU - Ovejero, Paloma

AU - Rosario Torres, M.

AU - Oliveira, Elisabete

AU - Santos, Sergio M.

AU - Lodeiro, Carlos

AU - Cano, Mercedes

N1 - M. Cano is grateful to the Ministerio de Economia y Competitividad (Spain), project CTQ2011-25172. E. Oliveira acknowledges the post-doctoral grant from Fundacao para a Ciencia e a Tecnologia (Portugal) SFRH/BPD/72557/2010. PROTEOMASS Scientific Society (Portugal) and PROTEOMASS Scientific Society (Spain) are also acknowledged for funding. C. Lodeiro thanks REQUIMTE-FCT PEst-C/EQB/LA0006/2013 for funding. We would like to thank Prof. Guillermo Orellana and Dr Ana Bel en Descalzo for their contribution and help with the lifetime measurement.

PY - 2014/11/21

Y1 - 2014/11/21

N2 - A new family of Pt(II) luminescent metallomesogens based on dicatenar pyridylpyrazolate ligands [Pt(pzR(n,n)py)2](R(n,n) ¼ C6H3(OCnH2n+1)2, n ¼ 4–18) has been prepared, and their mesomorphic and photophysicalproperties are described. The compounds were isolated as red (n ¼ 4–8) or yellow (n ¼ 10–18) solids atroom temperature, but the first ones were converted to yellow crystals by slow evaporation of achloroform–acetone mixed solution. All of them behave as discotic liquid crystal materials, exhibitinghexagonal columnar mesophases (Colh) in a wide range of temperatures. Photoluminescence studies inthe solid state at variable temperatures showed a high emission in the liquid crystalline phase, which wassignificantly red-shifted with respect to the yellow-green emission of the solid state. This photophysicalchange was attributed to the formation of aggregates through Pt(dz2)–Pt(dz2) interactions, thereby givingrise to the metal–metal-to-ligand charge transfers (3MMLCT) responsible for the luminescenceobserved. Taking advantage of these properties we have fabricated polymeric solid supports doped withthe platinum complex [Pt(pzR(10,10)py)2], which can be used as temperature sensors for real technologicalapplications. In addition, the Pt–bispyrazolate complexes and their corresponding pyrazole ligands havebeen proved to be useful as chemosensors towards Pd2+, Zn2+, Cd2+ and Hg2+ metal ions.

AB - A new family of Pt(II) luminescent metallomesogens based on dicatenar pyridylpyrazolate ligands [Pt(pzR(n,n)py)2](R(n,n) ¼ C6H3(OCnH2n+1)2, n ¼ 4–18) has been prepared, and their mesomorphic and photophysicalproperties are described. The compounds were isolated as red (n ¼ 4–8) or yellow (n ¼ 10–18) solids atroom temperature, but the first ones were converted to yellow crystals by slow evaporation of achloroform–acetone mixed solution. All of them behave as discotic liquid crystal materials, exhibitinghexagonal columnar mesophases (Colh) in a wide range of temperatures. Photoluminescence studies inthe solid state at variable temperatures showed a high emission in the liquid crystalline phase, which wassignificantly red-shifted with respect to the yellow-green emission of the solid state. This photophysicalchange was attributed to the formation of aggregates through Pt(dz2)–Pt(dz2) interactions, thereby givingrise to the metal–metal-to-ligand charge transfers (3MMLCT) responsible for the luminescenceobserved. Taking advantage of these properties we have fabricated polymeric solid supports doped withthe platinum complex [Pt(pzR(10,10)py)2], which can be used as temperature sensors for real technologicalapplications. In addition, the Pt–bispyrazolate complexes and their corresponding pyrazole ligands havebeen proved to be useful as chemosensors towards Pd2+, Zn2+, Cd2+ and Hg2+ metal ions.

KW - Discotics

KW - Metallomesogens

KW - Multi-functional materials

KW - Thermo-sensor

U2 - 10.1039/c4tc01666a

DO - 10.1039/c4tc01666a

M3 - Article

VL - 2

SP - 9167

EP - 9178

JO - JOURNAL OF MATERIALS CHEMISTRY C

JF - JOURNAL OF MATERIALS CHEMISTRY C

SN - 2050-7526

IS - 43

ER -