IR - Cyclohexanol 100 90 80 70 60 50 40 30 20 10 4000 3500 3000 2500 2000 1500 1000 500 Wave Number (cm) Band Intensity Assigned to the link Frequency (cm-l) Vibrational mode W M S % Transmittance
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- The protein haemerythrin (Her) is responsible for binding and carrying O2 in some invertebrates. Each protein molecule has two Fe2+ ions that are in very close proximity and work together to bind one molecule of O2, form ing an Fe2O2 group. (a) The Raman spectrum of oxygenated haemerythrinobtained with laser excitation at 500 nm has a band at 844 cm-1 which has been attributed to the O-O stretching mode of bound 16O2. Why is Raman spectroscopy and not infrared spectroscopy the method of choice for the study of the binding of O2 to haemerythrin? (b) Proof that the 844 cm-1band in the Raman spectrum of oxygenated haemerythrin arises from a bound O2 species may be obtained by conducting experiments on samples of haemerythrin that have been mixed with 18O2, instead of 16O2 . Predict the fundamental vibrational wavenumber of the 18O-18O stretching mode in a sample of haemerythrin that has been treated with 18O2. (c) The fundamental vibrational wavenumbers for the O-O stretching modes of O2,…How many normal modes of vibration are there for (a)NO,. (b) N20. (c) cyclohexane. (d) hexane?The force constant for the carbon-carbon stretching mode in acetylene is 1.5 x 106 dynes/cm. Calculate the frequency (in cm-1) for the carbon-carbon stretching mode of acetylene.
- The Γ3N for BeH2 from the preceeding number reduces to Ag + B2g + B3g + 2B1u + 2B2u + 2B3u. After removing symmmetry labels due to rotational and translational motion, how many of the vibrational labels are IR active and how many are Raman active? a. There are 3 IR active and 1 Raman active molecular vibrations. b. There are 1 IR active and 3 Raman active molecular vibrations. c.There are 3 IR active and 0 Raman active molecular vibrations. d. There are 6 IR active and 3 Raman active molecular vibrations.The lowest energy transition (J=0 --> J=1) in teh pure rotational spectrum of 12C16O occures ar 3.8026 cm-1. Calculate the rotational constant, B in Joules (1cm-1 = 100hc = 1.987*10-23 J)How many normal modes of vibration are there for (a) NO2 (b) N2O, (c) cyclohexane. (d) hexane?
- Use the analytical procedure in analytical chemistry to gain quantitative and qualitative information about Sudan IV dye in adulterated palm oil using the Raman spectroscopy protocola.) The spacings of the rotational fine structure lines of carbon dioxide 12C16O2 are determined from IR spectroscopy to be 0.7604 cm-1. Calculate the C=O bond length of the molecule (given masses: m(12C) = 12 amu, m(16O) = 15.9949 amu).Ans = ______ Angstroms b.) Suppose that the wavenumber of the J = 1 ← 0 rotational transition of 1H79Br considered as a rigid rotor was measured to be 17.89 cm-1, what is the bond length? Ans = ____ Angstroms When the moment of interia is 3.132x10^-47 kg*m^2(Given the isotopic masses:(m(79Br) = 78.9183 amu, m(81Br) = 80.9163 amu)Use the Analytical procedures in analytical chemistry to gain qualitative and quantitative information about palm oil adulterated with Sudan IV dye. Use the Raman spectroscopy as the analytical method.
- Match the region of the electromanetic spectrum with the type of chemical spectroscopy. Nuclear magnetic resonance (NMR) - electron and proton resonance Options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light Raman spectroscopy-molecular rotations options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light Electron excitation (energy level changes) Options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light IR spectroscopy - molecular vibrations Options: X-rays Microwaves Infared Radio waves Ultraviolet and visible light Ionization Options: X-rays Microwaves Infared Radio waves Ultraviolet and visible lightAnnotate the HNMR peak for 1.085, 4.046, 6.155, 68.57, 8.763Please refer to the images as much as you need to. For the following hydrocarbons, pick out 5 wavenumbers for each hydrocarbon, and give it its probable assignment for its structure. You may find this link useful: https://www.sigmaaldrich.com/US/en/technical-documents/technical-article/analytical-chemistry/photometry-and-reflectometry/ir-spectrum-table o-xylene (cm-1) : 985.76, 1021.06, 1052.51, 1119.30, 1383.43, 1465.62, 1495.11, 1604.66, 2859.82, 2874.76, 2922.19, 2937.08, 2968.08, 3016.57, 3049.67, 3063.02, 3105.51 m-xylene (cm-1) : 876.16, 904.28, 1039.26, 1094.05, 1169.56, 1376.70, 1397.17, 1458.12, 1491.51, 1538.93, 1557.96, 1591.83, 1612.18, 1652.69, 2730.72, 2863.59, 2920.44, 2944.72, 3015.77, 3104.24 p-xylene (cm-1) :1023.01, 1042.16, 1102.92, 1119.19, 1219.51, 1378.51, 1455.91, 1515.82, 1557.92, 1631.57, 1889.80, 2732.29, 2868.22, 2921.93, 2976.07, 2999.25, 3018.79, 3044.59, 3093.20, 3133.55, 3134.26