Predict the wavelength in nm of the lowest-energy, Ask an Expert

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Predict the wavelength (in nm) of the lowest-energy electronic transition in the following polymethine ion:
((CH_{3})_{2}N^{+}=CH-CH=CH-CH=CH-N(CH_{3})_2) Assme that all the C-C and C-N bond lengths equal 1.4A. Note that (N^+) and N contribute 1 and 2 pi-electrons, respectively.

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