Discuss ESR spectroscopy for determining any transition metal complex?
please giv a detailed ans
Answer:
Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a technique for studying chemical species that have one or more unpaired electrons, such as organic and inorganic free radicals or inorganic complexes possessing a transition metal ion. The basic physical concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but it is electron spins that are excited instead of spins of atomic nuclei. Because most stable molecules have all their electrons paired, the EPR technique is less widely used than NMR. However, this limitation to paramagnetic species also means that the EPR technique is one of great specificity, since ordinary chemical solvents and matrices do not give rise to EPR spectra.(1)
Since many transiton metal complexes contain unpaired d electrons, esr can tell you the number of unpaired electrons per atom as well as waht kind of atom the electron is bound by measuring the g-factor
g = μB B0/hv where
Magnetic field strength is denoted by B0
Planck's constant h = 6.6261 x 10-34 J s
Bohr magneton μB = 9.2740 x 10-24 J T-1
v= frequency of radiation
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Answer:
Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a technique for studying chemical species that have one or more unpaired electrons, such as organic and inorganic free radicals or inorganic complexes possessing a transition metal ion. The basic physical concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but it is electron spins that are excited instead of spins of atomic nuclei. Because most stable molecules have all their electrons paired, the EPR technique is less widely used than NMR. However, this limitation to paramagnetic species also means that the EPR technique is one of great specificity, since ordinary chemical solvents and matrices do not give rise to EPR spectra.(1)
Since many transiton metal complexes contain unpaired d electrons, esr can tell you the number of unpaired electrons per atom as well as waht kind of atom the electron is bound by measuring the g-factor
g = μB B0/hv where
Magnetic field strength is denoted by B0
Planck's constant h = 6.6261 x 10-34 J s
Bohr magneton μB = 9.2740 x 10-24 J T-1
v= frequency of radiation
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