Which single organic molecule has strong absorbance throughout the visible range?

Is there a single organic molecule that has strong absorbance throughout the visible range? For example a black dye that is based on a single molecule?

• Black dye is normally based on polymeric conjugated systems. – Ivan Neretin May 23 '16 at 21:13
• pentacene is a bluish-black powder, suggesting that it does have some adsorbance throughout the visible range... though primarily in red part. – permeakra May 23 '16 at 21:26
• Does graphite count as organic? – bon May 23 '16 at 21:29
• @bon doesn't graphite's absorption depend on the van der waals gap of the graphene sheets? – Sparkler May 23 '16 at 21:43
• – Mithoron May 23 '16 at 23:54

Quite a few dyestuffs will have strong absorption across the visible range of wavelengths, though few will have an entirely even absorbance. This won't matter much is they are concentrated enough and absorb most of the light at each wavelength.

Acid Black 1, for example, shows strong absorbance from the UV to just under 700 nm, which is most of the visible. Absorbance is stronger in the red but overall absorbance is large enough that it is sometimes used in black inks. See this paper for a sample absorbance spectrum:

There are quite a few other dyes with strong absorbance at most visible wavelengths and whether they appear black depends on the concentration.

Some metal complexes have been found as strong absorbers for the DSSC, starting with the so-called "black dye" ($\ce{[Ru(4,4',4''terpy-(COOH)3)(NCS)3]}$) ~1999.