A comparative study of two amphiphilic merocyanines: from monomers to aggregates in Langmuir and Langmuir–Blodgett mixed films

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Table SI1. 1H NMR chemical shifts (ppm) for merocyanine MC1 in CDCl3. See Scheme 1 for

the atom numbering.

δ1 δ2 δ3 δ4 δ5 δ6 δ7 δ8 δ9 δ10

7.69 7.35 7.49 7.27 4.27 1.94 1.55 1.25-1.45 0.91 5.03

Table SI2. AFM roughness of LB films obtained from 1:2 MC(1/2):AA solutions ( = 20 mN/m, transfer ratio = 100) Layer Number Roughness [Å] MC1 MC2 3 35 20 9 40 25 29 60 45

Figure SI1. Irreversibility of surface-pressure()/area-per-molecule isotherms for 2:1 MC(1/2):AA mixtures. T =20 °C. 10 20 30 40 50 60 70 80 0 10 20 30 40 50

area per molecule / Å2_{per molecule}

 / m N m -1 Mc1:AA = 2:1 Mc1:AA = 2:1 after 1 compression 20 30 40 50 60 70 80 90 0 10 20 30 40 50 _Mc2:AA=2:1 Mc2:AA=2:1 after 1 compression

area per molecule / Å2 per molecule



/ m

N

m

-1

Electronic Supplementary Material (ESI) for RSC Advances This journal is © The Royal Society of Chemistry 2012

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Figure SI2. Images of floating MC1 films taken at surface pressures 0.1, 3, 10 and 25 mN/m. The window width is 450 m.

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Figure SI3. Images of the MC1:AA 1: 2 mixture floating films taken at surface pressures 0, 10, 15 and 32 mN/m. The window width is 450 m.

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Figure SI4. UV-vis absorption spectra of LB films obtained with 1:2 MC:AA mole ratio: effect of the number of deposited layers. Left: MC1, right: MC2. Insets: maximum absorbances of the J bands vs. number of layers.

400 500 600 700 0.00 0.01 0.02 w avelength / nm absorbance initial interm ediate final

Figure SI5. Ambient-light induced photodegradation of an LB monolayer obtained from a 1:2 MC2:AA mixture. 300 400 500 600 700 0.00 0.25 0.50 0 5 10 15 20 25 30 0.2 0.3 0.4 0.5 Ab s607 n m layer number absorbance wavelength (nm) 400 500 600 700 800 0.0 0.5 1.0 0 5 10 15 20 25 30 35 0.0 0.2 0.4 0.6 0.8 1.0 1.2 layer number Ab s467 nm wavelength (nm) ab sorban ce

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Figure SI6. AFM images of 29-layer LB films obtained from 1:2 MC(1/2):AA solutions. MC1 on top.

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400 500 600 700 800 0.0 0.1 0.2 0.3 0.4  = 0° wavelength / nm absorb ance 400 500 600 700 800 0.0 0.1 0.2 0.3 0.4  = 30° ab sorb ance wavelength / nm

Figure SI7. Linear dichroism of a 9-layer film deposited from a 1:2 MC2:AA mixture at 25 mN m-1. Light polarization: vertical (solid), horizontal (dashed).