Transition Metals coloured ions Flashcards
why is colour produced from a complex
parts of the visible spectrum are absorbed and others are reflected
what does the colour of a transition metal compound depend on
the electronic configuration of the metal ion
what energy do electrons in the complex ion have
all the same energy in the d subshell
how is the d subshell split
ligands split the d-orbitals into two groups
one of higher and one of lower energy
why do ligands split the dsubshell
ligands repel electrons in the d orbital closest to it
factors which affect the value of deltaH
the ligand size strength of coordinate bond to the metal ion shape of the complex coordination number oxidation state of the metal in complex
what is the delta H
the d orbital gap
what has a larger deltaH tetrahedral or octahedral
octahedral
what does the colour of ions in solution depend on
which part of the visible spectrum is being absorbed
what changes in light absorption with different energy gaps
different frequencies are absorbed
is the absorbed frequency or reflected frequency observed
reflected
which ligands have a strong field
CN-, CO
which ligands have a weak field
NH3, H2O, Cl-
what are the two equations to find the frequency of light absorbed
deltaE = hv deltaE = hc / lamda
what causes a strong field
large deltaE gap
what causes a weak field
small deltaE gap
what is the symbol for energy gap
deltaE
what does lamda stand for
wavelength
what does c stand for
speed of light
what does h stand for
plancks constant
what does the v stand for
frequency
what does the intensity of light absorbed relate to
the number of ions it interacts with
the higher concentration of ions the more absorbance
how to complete calorimetry
choose a complimentary colour to the solution
prepare a set of standard solutions
make calibration curve
test the unknown with calorimeter and use graph to determine concentration
