Crystal Field Theory Flashcards
(21 cards)
Order of the stronger field ligands strongest to weakest
Cn-,Co are essentially the same energy, then NO2 is weaker followed by en and then NH3
What is en? (Pronounce it correctly)
Ethylenediamine
(Ethyl-lean-di-amine)
What are t2g orbitals
Only for octahedral geometries, these are the dxy,dxz,dzx orbitals that have a lower energy state for the ligands as the electron-electron repullsion between the electrons in the d block and the Lewis base are Farthest apart
What are the eg orbitals?
Dx^2-y^2 and dz^2, these are high in energy as are super close to the coordination sites
When writing a crystal field orbital, what’s the nomenclature?
t2g^nteg^n, if 0, dont write, do ^1 even if only 1 unpaired electron
What are the low and high state orbital nomenclature for tetrahedral geometries?
The low state is t2, the high state is just e (ex, e4t26, the order is reversed compared to octahedrals)
Violets range & complimentary color
400-430nm, yellow
Blues range & complimentary color
430nm-490nm, orange
Greens range & complimentary color
490nm-560nm, red
Yellows range and complimentary color
560nm-580nm, violet
Oranges range and complimentary color
580-620nm, blue
Reds range and complimentary color
620-700nm, green
What color fluoresces from white light?
Depends on what wavelength got absorbed. The color that emerges is the compliment of whatever wavelength was absorbed, for ex if the wavelength was between 620-700nm (red), you’d expect a green color to fluorescence
Low energy absorption corresponds to
Long wavelengths
Absorbence=
log(I0/It) aka log(%T/100). I0 is the intensity before and It is the intensity of light after passing thru the medium
Beers law
A=molar permittivity(function of wavelength)path length concentration of solution
It=
I0(10^-epsilonL*c)
What is paramagnetism
When you have a substance with unpaired electrons, it tends to move into a magnetic field
What is diamagnetism
When you have a substance with paired electrons in the d shell, it tends to be repeled from a magnetic field
Strong field ligands tend to form
Low spin weakly paramagnetic complexs
Weak field ligands tend to form
High spin strongly paramagnetic complexs
