Coordination Complex Quiz

Coordination compounds
composed of metal ions bonded with one or more ligands.
Ligands
nonmetals that may be single
atoms, ions, or molecules that donate electrons to the metal.
Monodentate
only one atom bonds to metal
Unit cell
The simplest portion of the structure that is repeated
Band
many closely spaced MO’s of nearly continuous energy
Valence Band
highest occupied band (HOMO)
Conduction Band
next highest empty band
Insulator
Large energy gap between valence and conduction band, electrons cannot move through material
Conductor
Partly filled valence and conduction bands (most metals) so little energy required for electron movement
Hole
electron vacancy that can also “move” in partially occupied bands
Semiconductors
Full valence band, empty conductance band but close together, energy gap < 2 eV
Si, Ge are common pure substances that are semiconductors
At low temperature they are insulators
At higher temperature they are conductors
Opposite temperature effect to metals
Madelung constant
sum of a series of numbers
representing the number of nearest neighbors and their
relative distance from a given ion
Phyllosilicates
(sheet or layer silicates) are a mineral group that includes clays and micas (layers of K+ ions between silicate and aluminate layers)
Sodalite
the simplest zeolite
Zeolite A = Linde type A
made of alpha supercage and sodalite b cages
rho-Zeolite
made of alpha cages
Faujasite
Zeolite X/Y
Based upon ?-cages and 6-membered rings
Isostructural with diamond
Most MOFs are not zeolitic
Typically they are not built from tetrahedra
Metalloporphyrins
lie at the heart of many
natural processes such as photosynthesis
metalloporphyrin is also at the heart of haemoglobin
Fe(porphyrin) side histidine other to O
coordinated one to histidine, O2
Magnetic Moment ?
? = 2.82 (? T)1/2
Spin Magnetic Moments
?s = 2vS(S+1)
Crystal Field Theory
used to describe dorbital
splitting
Crystal Field Theory can be used to account for:
Colors of transition metal complexes and Magnetic properties of transition metal complexes
Jahn-Teller Effect
“there cannot be unequal occupation of orbitals with identical energy”
chromophore
An atom or group of atoms that absorbs light
(whether or not a color is produced).
Frank-Condon Principle
The electronic transition from one energy state to another occurs so quickly that the
nuclei of the atoms involved are in effect stationary during the process.
Spin Selection Rule
changes in spin multiplicity are forbidden
Laporte selection rule
there must be a change in the parity
(symmetry) of the complex