Thus, absorption of 420-430 nm light renders a substance yellow, and absorption of 500-520 nm light makes it red. Here, complementary colors are diametrically opposite each other. This relationship is demonstrated by the color wheel shown on the right. The remaining light will then assume the complementary color to the wavelength(s) absorbed. When white light passes through or is reflected by a colored substance, a characteristic portion of the mixed wavelengths is absorbed. In horizontal diagrams, such as the one on the bottom left, wavelength will increase on moving from left to right. The wavelengths of what we perceive as particular colors in the visible portion of the spectrum are displayed and listed below. Other common colors of the spectrum, in order of decreasing wavelength, may be remembered by the mnemonic: ROY G BIV. The longest visible wavelength is red and the shortest is violet. Visible wavelengths cover a range from approximately 400 to 800 nm. Frequency is the number of wave cycles that travel past a fixed point per unit of time, and is usually given in cycles per second, or hertz (Hz). Wavelength is defined on the left below, as the distance between adjacent peaks (or troughs), and may be designated in meters, centimeters or nanometers (10 -9 meters). Electromagnetic radiation such as visible light is commonly treated as a wave phenomenon, characterized by a wavelength or frequency. As shown on the right, the component colors of the visible portion can be separated by passing sunlight through a prism, which acts to bend the light in differing degrees according to wavelength. Although we see sunlight (or white light) as uniform or homogeneous in color, it is actually composed of a broad range of radiation wavelengths in the ultraviolet (UV), visible and infrared (IR) portions of the spectrum. In this respect the human eye is functioning as a spectrometer analyzing the light reflected from the surface of a solid or passing through a liquid. Thus, quinone is yellow chlorophyll is green the 2,4-dinitrophenylhydrazone derivatives of aldehydes and ketones range in color from bright yellow to deep red, depending on double bond conjugation and aspirin is colorless. I'm sure other spectral simulation programs exist, but don't have much experience in that area.UV-Visible Spectroscopy Visible and Ultraviolet SpectroscopyĪn obvious difference between certain compounds is their color. If you have access to ChemDraw, you can simulate $^1$H and $^$C NMR data for any compound you draw. I'll leave that to you.Ĭhemical companies such as Sigma Aldrich or Fisher Scientific also sometimes supply spectroscopic data for the compounds they sell. It is likely that spectral data for this compound will be present in any paper where this molecule was synthesized (either in the main article or its supporting information).Įdit: I just did a brief literature search through Reaxys - most of the papers seemed centered around clinical trials rather than organic synthesis, although I will admit I didn't look over any of them in any great detail. If you have access to journal articles, you can also do a literature search for this compound.
If you search for Secnidazole, they appear to have MS and IR data for this compound. (or search sdbs database, it should be the first link) is a useful database that contains a variety of spectral data for a large number of compounds.
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