hypsochromic, a.
(hɪpsəʊˈkrəʊmɪk)
[ad. G. hypsochrom (M. Schütze 1892, in Zeitschr. f. physik. Chem. IX. 136), f. hypso- + Gr. χρῶµ-α colour: see -ic.]
Causing or characterized by a lightening of colour, or a shift of the absorption spectrum towards shorter wavelengths.
| 1892 Jrnl. Chem. Soc. LXII. i. 562 Definite atoms or groups of atoms on entering a molecule cause..a characteristic rise [read fall] (‘bathochromic groups’), or fall [read rise] (‘hypsochromic groups’), of the tint. 1932 S. J. Gregg tr. Eggert's Physical Chem. 559 The hydrogen atom itself is hypsochromic in nature, for on removing the unsaturated character of a chromophoric group by adding hydrogen to it the absorption band migrates toward the ultra-violet. 1946 [see hypochromic a. 2]. 1957 Jrnl. Biol. Chem. CCXXIX. 716 In addition to the reduction in extinction there is a hypsochromic shift of 2 to 3 mµ accompanying the formation of the polymers. 1972 Rys & Zollinger Fund. Chem. & Applic. Dyes x. 153 As a rule, the vatting of indigo derivatives..produces a hyposchromic shift. |