Optical spectroscopy of single molecule and aggregate hexabenzocoronene derivatives

A. J. Fleming; J. N. Coleman; A. B. Dalton; A. Fechtenkötter; M. D. Watson; K. Müllen; H. J. Byrne; W. J. Blau

doi:10.1117/12.463629

Optical spectroscopy of single molecule and aggregate hexabenzocoronene derivatives

A. J. Fleming, J. N. Coleman, A. B. Dalton, A. Fechtenkötter, M. D. Watson, K. Müllen, H. J. Byrne, W. J. Blau

Chemistry

Research output: Contribution to journal › Conference article › peer-review

Abstract

The low, medium and high concentration luminescence and luminescence-excitation spectra for alkyl substituted hexa-peri-hexabenzocoronene (HBC-C_8,2) and hexa(4-n-dodecylphenyl) substituted hexa-peri-hexabenzocoronene (HBC-PhC₁₂) are presented. A study of the concentration dependence of the optical properties of these self-assembling molecular nanowires, in the low to medium concentration regime, associates the spectrum at ∼ 10^-13 M with the single molecule, and indicates that previously published spectra of HBC's by others were the product of aggregation phenomena. The insertion of an exo-phenyl group between the HBC core and the alkyl side chains, as in HBC-PhC₁₂ was found not to extend the conjugation, but did increase the inhomogeneous broadening of the single molecule luminescence. The continued presence of HBC-PhC ₁₂ single molecules, at high concentration, implies that HBC-C_8,2aggregates are thermodynamically more stable than HBC-PhC₁₂ aggregates. In conclusion, the spectroscopic properties of both derivatives were found to be very sensitive to aggregation at low concentration and strongly correlated to the observed macroscopic physical properties.

Original language	English
Pages (from-to)	685-695
Number of pages	11
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	4876
Issue number	2
DOIs	https://doi.org/10.1117/12.463629
State	Published - 2002
Event	Opto-Ireland 2002: Optics and Photonics Technologies and Applications - Galway, Ireland Duration: Sep 5 2002 → Sep 6 2002

Keywords

Aggregation
Columnar aggregates
Coronene
H-aggregates
HBC
Hexabenzocoronene
Nanowires
Optical spectroscopy
Self-assembling
Single molecule

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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title = "Optical spectroscopy of single molecule and aggregate hexabenzocoronene derivatives",

abstract = "The low, medium and high concentration luminescence and luminescence-excitation spectra for alkyl substituted hexa-peri-hexabenzocoronene (HBC-C8,2) and hexa(4-n-dodecylphenyl) substituted hexa-peri-hexabenzocoronene (HBC-PhC12) are presented. A study of the concentration dependence of the optical properties of these self-assembling molecular nanowires, in the low to medium concentration regime, associates the spectrum at ∼ 10-13 M with the single molecule, and indicates that previously published spectra of HBC's by others were the product of aggregation phenomena. The insertion of an exo-phenyl group between the HBC core and the alkyl side chains, as in HBC-PhC12 was found not to extend the conjugation, but did increase the inhomogeneous broadening of the single molecule luminescence. The continued presence of HBC-PhC 12 single molecules, at high concentration, implies that HBC-C8,2aggregates are thermodynamically more stable than HBC-PhC12 aggregates. In conclusion, the spectroscopic properties of both derivatives were found to be very sensitive to aggregation at low concentration and strongly correlated to the observed macroscopic physical properties.",

keywords = "Aggregation, Columnar aggregates, Coronene, H-aggregates, HBC, Hexabenzocoronene, Nanowires, Optical spectroscopy, Self-assembling, Single molecule",

author = "Fleming, {A. J.} and Coleman, {J. N.} and Dalton, {A. B.} and A. Fechtenk{\"o}tter and Watson, {M. D.} and K. M{\"u}llen and Byrne, {H. J.} and Blau, {W. J.}",

year = "2002",

doi = "10.1117/12.463629",

language = "English",

volume = "4876",

pages = "685--695",

number = "2",

note = "Opto-Ireland 2002: Optics and Photonics Technologies and Applications ; Conference date: 05-09-2002 Through 06-09-2002",

}

TY - JOUR

T1 - Optical spectroscopy of single molecule and aggregate hexabenzocoronene derivatives

AU - Fleming, A. J.

AU - Coleman, J. N.

AU - Dalton, A. B.

AU - Fechtenkötter, A.

AU - Watson, M. D.

AU - Müllen, K.

AU - Byrne, H. J.

AU - Blau, W. J.

PY - 2002

Y1 - 2002

N2 - The low, medium and high concentration luminescence and luminescence-excitation spectra for alkyl substituted hexa-peri-hexabenzocoronene (HBC-C8,2) and hexa(4-n-dodecylphenyl) substituted hexa-peri-hexabenzocoronene (HBC-PhC12) are presented. A study of the concentration dependence of the optical properties of these self-assembling molecular nanowires, in the low to medium concentration regime, associates the spectrum at ∼ 10-13 M with the single molecule, and indicates that previously published spectra of HBC's by others were the product of aggregation phenomena. The insertion of an exo-phenyl group between the HBC core and the alkyl side chains, as in HBC-PhC12 was found not to extend the conjugation, but did increase the inhomogeneous broadening of the single molecule luminescence. The continued presence of HBC-PhC 12 single molecules, at high concentration, implies that HBC-C8,2aggregates are thermodynamically more stable than HBC-PhC12 aggregates. In conclusion, the spectroscopic properties of both derivatives were found to be very sensitive to aggregation at low concentration and strongly correlated to the observed macroscopic physical properties.

AB - The low, medium and high concentration luminescence and luminescence-excitation spectra for alkyl substituted hexa-peri-hexabenzocoronene (HBC-C8,2) and hexa(4-n-dodecylphenyl) substituted hexa-peri-hexabenzocoronene (HBC-PhC12) are presented. A study of the concentration dependence of the optical properties of these self-assembling molecular nanowires, in the low to medium concentration regime, associates the spectrum at ∼ 10-13 M with the single molecule, and indicates that previously published spectra of HBC's by others were the product of aggregation phenomena. The insertion of an exo-phenyl group between the HBC core and the alkyl side chains, as in HBC-PhC12 was found not to extend the conjugation, but did increase the inhomogeneous broadening of the single molecule luminescence. The continued presence of HBC-PhC 12 single molecules, at high concentration, implies that HBC-C8,2aggregates are thermodynamically more stable than HBC-PhC12 aggregates. In conclusion, the spectroscopic properties of both derivatives were found to be very sensitive to aggregation at low concentration and strongly correlated to the observed macroscopic physical properties.

KW - Aggregation

KW - Columnar aggregates

KW - Coronene

KW - H-aggregates

KW - HBC

KW - Hexabenzocoronene

KW - Nanowires

KW - Optical spectroscopy

KW - Self-assembling

KW - Single molecule

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U2 - 10.1117/12.463629

DO - 10.1117/12.463629

M3 - Conference article

AN - SCOPUS:0042062282

SN - 0277-786X

VL - 4876

SP - 685

EP - 695

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

IS - 2

T2 - Opto-Ireland 2002: Optics and Photonics Technologies and Applications

Y2 - 5 September 2002 through 6 September 2002

ER -

Optical spectroscopy of single molecule and aggregate hexabenzocoronene derivatives

Abstract

Keywords

ASJC Scopus subject areas

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