Transcript Slide 1
Coordination complexes [CoCl2(en)2]Cl dichlorobis(en)cobalt(III) chloride Cl Cl N trans- N same Co N Co N N N Cl Cl Cl Cl N cis- N N Co N Co enantiomers N N N Cl Cl N N N Coordination complexes coordination number 4 Na[FeCl4] [Pt(NH3)2Cl2] sodium tetrachloroferrate(III) diamminedichloroplatinum(II) square planar tetrahedral (rare) Cl Cl cis Fe Pt Cl NH3 Cl Cl Cl no geometric isomers optical isomers NH3 trans H3N Cl Pt Cl NH3 no optical isomers Bonding localized electron model octahedral d 2sp3 square planar dsp2 tetrahedral sp3 linear sp predicts shapes does not predict colors magnetic properties Crystal Field Model Crystal Field Model dz2 dx2-y2 dxy dyz ligand lone pair ed-orbital electrons crystal field splitting colors electrostatic repulsion dxz colors 560 nm 580 nm 490 nm 620 nm 430 nm 800 nm 400 nm [Ti(H2O)6]3+ red eg dz2 h 510 nm t2g dxy dx2-y2 dyz dxz E = hc = h spectrochemical series CN- > NO2- > en > NH3> H2O > OH- > F- > Cl- > Br- > Istrong field large as charge increases, increases weak field small colors eg eg t2g t2g low spin high spin high spin d5 [Zn(en)3]2+ d10 Sc3+ d0 colorless weakly colored spectrochemical series CN- > NO2- > en > NH3> H2O > OH- > F- > Cl- > Br- > Istrong field large weak field small colors coordination number = 4 tet = 4 9 oct always high spin tetrahedral dz2 dx2-y2 dxy dyz square planar dx2-y2 dxy dz2 dyz dxz dxz colors coordination number = 2 linear dz2 ligands along z-axis dyz dxz dxy dx2-y2 magnetic properties compounds with unpaired e[Fe(CN)6]4- paramagnetic [Fe(H2O)6]2+ eg eg t2g t2g diamagnetic paramagnetic Guoy balance spectrochemical series CN- > NO2- > en > NH3> H2O > OH- > F- > Cl- > Br- > Istrong field large weak field small magnetic properties compounds with unpaired efor ≤ 5 unpaired e- paramagnetic (BM) = n(n+2) [Fe(H2O)6]2+ eg µ = √ 24 µ = 4.90 Guoy balance t2g spectrochemical series CN- > NO2- > en > NH3> H2O > OH- > F- > Cl- > Br- > Istrong field large weak field small Coordination Complexes 20 Questions mineral yes vegetable yes animal yes Fe2+ + O2 strong field - O2 weak field red blue