Allanal 24‑10‑30 is a newly synthesised organic chromophore designed to mimic the structural‑colour mechanisms found in avian plumage. In this study we report the full physicochemical characterisation of Allanal 24‑10‑30, its integration into model feather‑like matrices, and a comparative analysis of the resulting optical properties with those of natural avian pigments. The compound was prepared via a three‑step convergent synthesis, yielding 78 % overall. High‑resolution mass spectrometry (HR‑MS) and ^1H/^13C NMR confirmed the intended structure. UV‑Vis absorption peaks at 380 nm and 540 nm, while fluorescence emission exhibited a Stokes shift of 120 nm, matching the spectral signatures of iridescent feathers observed in several passerine species. When incorporated into a keratin‑based scaffold, Allanal 24‑10‑30 generated a hue that closely approximates the vivid violet of the Cyanocitta cristata (blue jay) and the deep mauve of the Ptilonorhynchus violaceus (violet‑crowned woodswallow). Computational TD‑DFT calculations rationalise the observed bathochromic shift in terms of extended π‑conjugation and intramolecular charge transfer. Our findings suggest that Allanal 24‑10‑30 can serve as a versatile, bio‑compatible colourant for biomimetic applications and offers a new platform for probing the molecular basis of avian coloration.
Word count: ~190 words (adjust to journal limits). allanal 24 10 30 aviana violet and nicole aria
Purity was verified by analytical HPLC (≥98 %). Purity was verified by analytical HPLC (≥98 %)
Spectroscopic data:
Keratin was extracted from chicken feathers (protocol of Krause 2010) and cast into 200 µm thick films. Allanal 24‑10‑30 (0.5 % w/w) was dissolved in ethanol and infiltrated into the keratin matrix by vacuum‑assisted impregnation (30 min). Films were dried under N₂ at 25 °C. its integration into model feather‑like matrices
Aviana Violet was isolated from the plumage of Cyanocitta cristata following the protocol of Miller 2015. Nicole Aria was extracted from the wing feathers of Ptilonorhynchus violaceus (Miller 2017). Both extracts were purified by preparative HPLC and characterised by the same spectroscopic methods as above.