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Denoting the shift of an absorption spectrum maximum to a shorter wavelength (greater energy).
[hypso- + G. chroma, color]
Farlex Partner Medical Dictionary © Farlex 2012
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There is a blue shift (hypsochromic shift) as the pH increases from pH 8 to pH 10 due to reduction in size of particles from large size to small size.
Within the next 35 minutes, the solution turns dark red and a hypsochromic effect from 552 nm to 525 nm is noticed for the SPR signal.
Upon irradiation, the peak at 664 nm has a progressively blue shift to shorter wavelength (Figure 6(b)) because of hypsochromic effect [14, 15].
Table 4 and Figure 3 show that regression coefficients y and b ([c.sub.1] and [c.sub.2]) in all the equations obtained are positive; hence, the increase in the polarity and the nucleophilicity of the medium results in a hypsochromic shift of the longwavelength absorption band.
This hindrance takes the it electrons of the ring double bond out of plane with respect to those of the chain, causing a hypsochromic shift (displacement of [[lambda].sub.max] to shorter wavelength), a hypochromic effect (decrease in absorbance) and loss of fine structure (spectrum with less defined peaks).
Typically, the intensive surface plasma resonance (SPR) band of AgNPs has a hypsochromic shift from 415 to 386 nm, and it is attributed to the free conduction electrons on the surface of AgNPs (intrahand excitation) (41).
Photophysical analysis shows that both the maximum absorption and photoluminescence spectra of P[F.sub.10]-P2V[P.sub.35], P[F.sub.10]-P2V[P.sub.55], and P[F.sub.10]-P2V[P.sub.75] thin films exhibit a hypsochromic shift with an increase in MeOH from 0-90 vol.%.
CF, DCM) show hypsochromic shifts in comparison to polar solvents.
The ortho dihydroxyl group in ring B was detected by a hypsochromic shift of band I after addition of Al[Cl.sub.3]/ HCl compared to Al[Cl.sub.3] spectrum (ca 25 nm).
Despite this, for PPME the maximum peak ([[lambda].sub.max] = 675 nm) is hypsochromic shift with regard to that of PPa ([[lambda].sub.max] = 676 nm).
In this regard the accepted mechanism suggests that the dye cations bind to adjacent sites of the polymer forming a single individual compound, which is considered to arise from electrostatic interaction among neighboring dye molecules and fixed sites on polymer as a result of which they suffer effective aggregation resulting in hypochromic and hypsochromic spectral shifts in the absorption band of the dye [26].