Surface Enhanced Raman Spectroscopic Study of Isomeric Methylthiophenes in Silver Colloid

Mukherjee, Kasturi; Bhattacharjee, D.; Misra, T. N.

doi:10.1006/jcis.1998.6066

Cited by 10 publications

(11 citation statements)

References 31 publications

(18 reference statements)

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“…Each shows a medium to low intensity band of coordinated tpy groups: (i) ring-stretching modes at 1610 to 1600 cm À1 , 1570 cm À1 and 1535 to 1548 cm À1 , (ii) in plane deformation mode at 1288 cm À1 , and (iii) asymmetric ring breathing mode at about 1025 cm À1 . 38,39 However, the strongest bands in these spectra are bands of thiophene-2,5-diyl units, 33,[40][41][42][43] which appeared at 1484, 1450 and 1405 cm À1 for P Zn M-type dynamers, and at 1484, 1457 and 1411 to 1417 cm À1 for P Zn B-type dynamers. Different end-capping of hexyl-groups has very little impact on the spectral pattern.…”

Section: Raman Spectra Of Dynamersmentioning

confidence: 95%

Alcohol-soluble bis(tpy)thiophenes: new building units for constitutional dynamic conjugated polyelectrolytes

Štenclová

Svoboda

Šloufová

et al. 2015

Phys. Chem. Chem. Phys.

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New building units (unimers) for metallo-supramolecular polymers 2,5-bis(2,2':6',2''-terpyridine-4'-yl)thiophene, M, and 5,5'-bis(2,2':6',2''-terpyridine-4'-yl)(2,2'-bithiophene), B, with ionic groups attached to thiophene rings are prepared by the modification of corresponding bromo-precursors and assembled with Zn(2+) and Fe(2+) ions into alcohol-soluble conjugated constitutional-dynamic polyelectrolytes (polyelectrolyte dynamers). Ionization of side groups only slightly affects the absorption spectra of unimers as well as dynamers but dramatically changes their solubility. Cyclic conformations of unimer molecules resulting from intramolecular interactions between tpy end-groups and cationic or polar (-CH2Br) side groups are proposed to explain the spectral conformity of the M- and B-type unimers and their dynamers and also inhibition of the ionization reaction with tpy end-groups. The absorption spectra and excitation profiles of Raman spectra show that mainly the red arm of the metal-to-ligand charge transfer band of Fe-dynamers is significantly contributed with transitions involving thiophene rings. The constitutional dynamics of Zn-dynamers is fast while that of Fe-dynamers is so slow that it allows effective separation of the dynamer to fractions in SEC columns. Electronic spectra and viscosity measurements proved that excess of Fe(2+) ions results in shortening of the dynamer chains and their end-capping by these ions.

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Section: Raman Spectra Of Dynamersmentioning

confidence: 95%

Alcohol-soluble bis(tpy)thiophenes: new building units for constitutional dynamic conjugated polyelectrolytes

Štenclová

Svoboda

Šloufová

et al. 2015

Phys. Chem. Chem. Phys.

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“…The concentration of the ACN in the sol was kept constant so that the intensity of the ACN bands, particularly of the intense 921 cm −1 band, could be used for normalization of the SERS bands of the 2-BP molecule. It is established that ACN bands do not show any surface enhancement in silver hydrosol [25][26][27][28] and so any possible interaction of the ACN with silver colloid can be neglected. The normal Raman spectra of ACN in water and also in silver hydrosol without 2-BP have been recorded.…”

Section: Concentration-dependent Surface-enhanced Raman Spectra Of 2-bpmentioning

confidence: 99%

Concentration-dependent surface-enhanced Raman scattering of 2-benzoylpyridine adsorbed on colloidal silver particles

Chowdhury¹,

Ghosh

2004

Journal of Colloid and Interface Science

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“…The concentration of the ACN in the sol was kept almost constant, so that the intensity of the ACN bands, particularly of the intense 921 cm 1 band, could be used for normalization of the SERS bands of the BP molecules. It is established that ACN bands do not show any surface enhancement in silver hydrosol 32,33 and so any possible interaction of the ACN with silver colloid can therefore be neglected.…”

Section: Concentration-dependent Sers Spectra Of Isomeric Bpsmentioning

confidence: 99%

Adsorption of 3‐ and 4‐benzoylpyridine on colloidal silver particles: a surface‐enhanced Raman scattering study

Chowdhury

Ghosh

2004

J Raman Spectroscopy

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Surface-enhanced Raman scattering (SERS) spectra of 3-and 4-benzoylpyridine (BP) adsorbed on silver hydrosols were compared with the FTIR and normal Raman spectra in bulk and in solution. With a small fractional change in adsorbate concentration, the SER spectra of isomeric BPs show significant changes in their features, indicating different orientational changes of the different parts of the flexible molecule on the colloidal silver surface with adsorbate concentration. The appearance of a broad, long-wavelength band in the absorption spectra of the silver sol due to solute-induced coagulation of colloidal silver particles is found to be red shifted with increase in adsorbate concentration. The SER excitation profiles indicate that the resonance of the Raman excitation radiation with the new aggregation band contributes more to the SERS intensity than that with the original sol band.

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Surface Enhanced Raman Spectroscopic Study of Isomeric Methylthiophenes in Silver Colloid

Cited by 10 publications

References 31 publications

Alcohol-soluble bis(tpy)thiophenes: new building units for constitutional dynamic conjugated polyelectrolytes

Alcohol-soluble bis(tpy)thiophenes: new building units for constitutional dynamic conjugated polyelectrolytes

Concentration-dependent surface-enhanced Raman scattering of 2-benzoylpyridine adsorbed on colloidal silver particles

Adsorption of 3‐ and 4‐benzoylpyridine on colloidal silver particles: a surface‐enhanced Raman scattering study

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