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neocyanine
neocyanine n. 
/nɪəˈsʌɪəniːn/, /ˌnioʊˈsaɪənən/ Chemistry any of a group of cyanine dyes which are quaternary iodides derived from lepidine and were formerly used to sensitize photographic emulsions and plates to infrared light.
Brit. /ˌniːə(ʊ)ˈsʌɪəniːn/
, /ˌniːə(ʊ)ˈsʌɪəniːn//nɪəˈsʌɪəniːn/U.S. /ˌnioʊˈsaɪəˌnin/
, /ˌnioʊˈsaɪəˌnin//ˌnioʊˈsaɪənən/ΚΠ
1926 M. L. Dundon et al. in Jrnl. Optical Soc. Amer. 12 397 Dr. H. T. Clarke..noticed that the condensation gave rise to a dye less soluble than Kryptocyanine... It appears to be very valuable for photography in the near infrared and has been named ‘neocyanine’.
1934 Philos. Trans. (Royal Soc.) A. 232 463 An attempt was made to photograph absorption in the near infra-red by the aid of ammonia sensitized neocyanine and dicyanine plates.
1960 K. M. Hornsby tr. P. Glafkides Photogr. Chem. II. 889 Another method of synthesis of neocyanines is to react the quaternary salt of a methyl base, with the quaternary salt of a base having a vinyl chain, substituted in β with a heterocyclic nucleus.
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