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Coordination complexes

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

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Coordination complexes

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

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

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

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

  5. dz2 dx2-y2 dxy dyz dxz  colors 560 nm [Ti(H2O)6]3+ 580 nm 490 nm red 430 nm 620 nm eg 800 nm 400 nm 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 

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

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

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

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

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

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

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