Coordination complexes

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Presentation transcript:

Coordination complexes [CoCl2(en)2]Cl dichloro bis(en) cobalt(III) chloride Cl Co Cl N N N trans- same Co Cl Cl Co Cl N Co N Cl cis- enantiomers N

Coordination complexes coordination number 4 Na[FeCl4] [Pt(NH3)2Cl2] sodium tetrachloro ferrate(III) diamminedichloroplatinum(II) tetrahedral (rare) square planar Cl Cl cis NH3 Pt Fe Cl NH3 Cl Cl trans Cl H3N Cl Pt no geometric isomers Cl NH3 optical isomers no optical isomers

Bonding Crystal Field Model localized electron model octahedral d 2sp3 predicts shapes square planar dsp2 tetrahedral sp3 linear sp does not predict colors magnetic properties Crystal Field Model

Crystal Field Model  electrostatic repulsion ligand lone pair e- dz2 dx2-y2 dxy dyz dxz electrostatic repulsion ligand lone pair e- d-orbital electrons crystal field splitting  colors

colors [Ti(H2O)6]3+ red  hc E = = h  spectrochemical series CN- 560 nm [Ti(H2O)6]3+ 580 nm 490 nm red 430 nm 620 nm eg 800 nm 400 nm dz2 dx2-y2 dxy dyz dxz  h 510 nm t2g hc E = = h  spectrochemical series CN- > NO2- > en > NH3 > H2O > OH- > F- > Cl- > Br- > I- strong field weak field as charge increases,  increases large  small 

colors  [Zn(en)3]2+ d10 Sc3+ d0 high spin d5 colorless weakly colored t2g eg t2g eg  low spin high spin [Zn(en)3]2+ d10 Sc3+ d0 high spin d5 colorless weakly colored spectrochemical series CN- > NO2- > en > NH3 > H2O > OH- > F- > Cl- > Br- > I- strong field weak field large  small 

colors coordination number = 4 tetrahedral tet = oct 9 oct dz2 dx2-y2 dxy dyz dxz always high spin square planar dx2-y2 dxy dz2 dyz dxz

colors coordination number = 2 linear ligands along z-axis dz2 dyz dxz dxy dx2-y2

magnetic properties compounds with unpaired e- paramagnetic [Fe(CN)6]4- [Fe(H2O)6]2+ eg t2g eg t2g Guoy balance diamagnetic paramagnetic spectrochemical series CN- > NO2- > en > NH3 > H2O > F- > OH- > Cl- > Br- > I- strong field large  weak field small 

magnetic properties compounds with unpaired e- paramagnetic for ≤ 5 unpaired e-  (BM) =  n(n+2) [Fe(H2O)6]2+ eg t2g 24 µ = √ µ = 4.90 Guoy balance spectrochemical series CN- > NO2- > en > NH3 > H2O > F- > OH- > Cl- > Br- > I- strong field large  weak field small 

Coordination Complexes 20 Questions mineral Fe2+ yes + O2 - O2 strong field weak field vegetable red blue yes animal yes