The IR spectrum of HCN shows 3 absorption bands at 3312 cm^-1,
2089 cm ^-1, and...
The IR spectrum of HCN shows 3 absorption bands at 3312 cm^-1,
2089 cm ^-1, and 712cm^-1. From this info alone can you deduce
whether HCN is linear or not? Explain.
1H NMR spectrum A corresponds to a molecule with the formula C3H5Cl. The compound shows significant IR bands at 730 (see Problem 53 of Chapter 11), 930, 980, 1630, and 3090 cm-1.
(a) Deduce the structure of the molecule.
(b) Assign each NMR signal to a hydrogen or group of hydrogens.
(c) The “doublet” at δ = 4.05 ppm has J ≈ 6 Hz. Is this in accord with your assignment in (b)?
(d) This “doublet,” upon five-fold expansion, becomes...
a)
how many CO stretching absorption are in the IR spectrum of
fac-(MeCN)3Cr (CO)3
b) Which irreducible representations correspond to
these absoprtions?
Task 3. Spectroscopy.
a) Why are flouroscence bands lower in energy than absorption
bands?
b) If an electronic transition is symmetry forbidden and spin
forbidden, list two ways of overcoming this to explain why the
bands are still seen in the spectrum?
c) Define the coupling operator that sits between the excited
state wave function and the ground state wave function in the
transition moment integral.
Blackbody Spectrum Question
(a) Examination of the spectrum of a star shows
that it is brightest at the frequency 1.5 × 10^14 Hz. What is its
temperature? How does this compare to the Sun’s temperature? What
color will this star appear to be?
(b) How does the surface brightness of this
star compare with Sun’s surface brightness, according to the
Stefan-Boltzmann law?
(c) Somewhat surprisingly, the star in question
appears extremely bright, much brighter than the Sun would appear
at...
1.Which C = O aliphatic group absorbs more to the right of the
IR spectrum? Show an example and explain the reason.
2. What functional groups show characteristic absorptions in the
region of traces of the IR spectrum? Provide one molecule for each
case
3.What is the expression for the Planck equation as a function
of the wave number? Apply it to calculate the energy when is
equal to 3.0 μ. Emphasize the units
What is a blackbody spectrum? What is an emission line spectrum?
What is an absorption line spectrum? How are each created? Which of
these spectra (or which combination of these spectra) best
describes the light coming form the sun?
from an analysis of IR spectrum of dimedone , is it possible to
determine the keto/enol ratio? How can one do this ? Describe two
other methods to distinguish between the keto-and enol-forms in
organic chemistry.