Question

13. What is internal standard used in ESR spectroscopy?
(a) TMS
(b) DMS
(c) DPPH
(d) DDQ​

Answer 1

Answer:

(c)DPPH

Explanation

Answer 2

(c) DPPH is the correct answer. DPPH  is an internal standard utilized in ESR spectroscopy.

Electron spin resonance (ESR):

• Electron spin resonance (ESR) spectroscopy, invented through Zavoiskii in 1944, is much like NMR spectroscopy.
• ESR spectroscopy is absorption spectroscopy which includes the absorption of radiation withinside the microwave region (10⁴–10⁶ MHz) through materials containing one or extra unpaired electrons.

Explanation:

• DPPH has been studied drastically with ESR due to its capacity to soak up unfastened radicals.
• A modulated frequency and various modern flowing via the Helmholtz coil are used in this dissertation to decide the g-component of DPPH in comparison to the general theoretical value.
• DPPH has an unpaired electron and its orbital contribution to the magnetic second is negligible.
• Because the molecule acts on a relatively delocalized orbit.
• Since the electron is unfastened, most effectively its spin contributes to the magnetic second.

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