Acenen.1
/ˈeɪsiːn/, U.S. /ˈeɪsin/ Geology. Now historical.
W. Whewell's suggested name for: the earliest epoch of the Tertiary period, the Palaeocene.The name was not adopted by Lyell, who did, however, use Whewell's terms Eocene, Miocene, and Pliocene.
ΚΠ
1831 W. Whewell Let. 31 Jan. in I. Todhunter William Whewell (1876) II. 111 It has occurred to me that καινός is a better word than νέος and I propose for your four terms, 1 acene, 2 eocene, 3 miocene, 4 pliocene.
1955 Jrnl. Hist. Ideas 16 214 Whewell suggested..the following: (1) acene, (2) eocene, (3) miocene, (4) pliocene.
2008 M. J. S. Rudwick Worlds before Adam xxiii. 367 The ‘Acene’ had dropped out of sight in Lyell's public scheme, though not out of his mind.
This is a new entry (OED Third Edition, December 2011; most recently modified version published online December 2021).
acenen.2
/ˈeɪsiːn/, U.S. /ˈeɪsin/ Chemistry.
Any of the series of compounds with a molecule consisting of a line of fused benzene rings.The simplest such compounds are naphthalene n. (two rings) and anthracene n. (three rings).
ΚΠ
1940 Chem. Abstr. 34 3263 It is suggested that hydrocarbons formed by linear fusion of benzene nuclei be designated acenes. Pentacene and hexacene are already in use.
1955 Adv. in Cancer Res. 3 142 Higher acenes like naphthacene and pentacene..are very reactive towards this reagent.
1995 School Sci. Rev. June 68/1 Beyond anthracene, the acenes (linear polycyclic benzenoid hydrocarbons) are named according to the number of rings present. Tetracene, pentacene, hexacene and heptacene possess four, five, six and seven fused rings, respectively.
2007 V. Podzorov in Z. Bao & J. Locklin Org. Field-effect Transistors ii. 67 Although some soluble derivatives of linear acenes..have been demonstrated..much more experimental work needs to be done to optimize these systems for solubility and charge carrier mobility.
This is a new entry (OED Third Edition, December 2011; most recently modified version published online December 2021).
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