An octahedral metal-cyanide complex witht he formula [M(H2O)5CN]+ absorbs visble
ID: 1015859 • Letter: A
Question
An octahedral metal-cyanide complex witht he formula [M(H2O)5CN]+ absorbs visble light with a wavelength of 450 nm. This complex participates in a ligand substitution reaction to produce the closely related complex [M(H2O)5Cl]+. What would you predict about the wavelength of visible light that the chloride complex absorbs, relative to that absorbed by the cyanide complex?
a)The chloride complex will absorb visble light with a longer wavelength that the cyanide complex.
b) The chloride complex will absorb visble light with a shorter wavelength that the cyanide complex.
c) The chloride complex will absorb visble light with the same wavelength as the cyanide complex.
d)It is impossible to predict the wavelength of visible ight absorbed by the chloride complex relative to the cyanide complex.
Explanation / Answer
answer:
a)The chloride complex will absorb visble light with a longer wavelength that the cyanide complex.
explanation:
CN- is the strong field ligand . so its complex has higher CFSE value and Cl- weak field lignad it has lower CFSE value
lower CFSE value means higher wavelength .