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Issue 47, 2013
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Molecular recognition at growing crystal faces revealed by phase sensitive second harmonic microscopy

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Abstract

The absolute orientation of the local average polarization in relation to the main crystal growth direction has been investigated for channel-type inclusions of perhydrotriphenylene (PHTP) and five guests: N,N-dimethyl-3-nitroaniline (DMNA), 1-(4-nitrophenyl)-piperazine (NPP), 4-iodo-4′-nitrobiphenyl (INBP), 4-amino-4′-nitrostilbene (ANS) and N,N-dimethyl-4(4-nitrophenylazo)aniline (DNAA). For this we have used phase sensitive second harmonic generation microscopy (PH-SHM) and a crystal of 2-cyclooctylamino-5-nitropyridine (COANP) as a NLO reference material for which we know the absolute polarity from X-ray anomalous scattering. Bi-polar states of all five inclusion compounds have been confirmed. Application of PS-SHM revealed that the nitro groups preferably point into the direction of growth. The attributed molecular orientation is further on confirmed (PHTP/DNAA and PHTP/INBP) by scanning pyroelectric microscopy. Results from Monte Carlo (MC) simulations allow us to conclude that the fundamental energy parameter ΔEf driving stochastic polarity formation is larger than zero.

Graphical abstract: Molecular recognition at growing crystal faces revealed by phase sensitive second harmonic microscopy

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Publication details

The article was received on 15 Jul 2013, accepted on 12 Sep 2013 and first published on 08 Oct 2013


Article type: Paper
DOI: 10.1039/C3RA43641A
Citation: RSC Adv., 2013,3, 25145-25150
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    Molecular recognition at growing crystal faces revealed by phase sensitive second harmonic microscopy

    H. Aboulfadl, M. Bonin, M. Burgner, K. Brahimi and J. Hulliger, RSC Adv., 2013, 3, 25145
    DOI: 10.1039/C3RA43641A

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