Complex Ion Geometry OTetrahedr al,square planar,octahedral NH NH: NHy N HN HN NH H NH3 II N- N NIIs H: NH is) NI NII 21 HN -Pt H H ) XVI
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CoCl,nNH: OConsider CoCls'nNHs,with n=4,5,6 CoCl 4NH3 CoCL 5NH CoCl 6NH 4 XV-12
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CoCl;nNH3 OHow can we have compounds with these various compositions? ODissolve in water and add AgNO.Some Cl precipitates as AgCl immediately,some much more slowly.This indicates the relative number of Cl that are ionic or covalent. n=4 n=5 n=6 5 -13
XV-13
CoClnNH: ●Comp osition Color No.Cl Formula pptd ●C0CL36NH3 yellow 3 [CONHC ●C0CL35NH3 purple 2 [CONHCI]CL ●CoC134NH3 green 1 [Co(NH)C]CI ●CoC134NH3 violet 1 [CONHCL]CI OThe green and violet compounds must have some further difference. ●AⅡhave6 ligands(coordination number=O)
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Inner Sphere vs Outer Sphere Coordination 日3 H3 N N ∠NH, C12l HN NH3 ] N H 3 [CO(NHCL 2 [CONH3CICL 1 [Co(NH)C1JCI 1 [CO(NHC]CI H H; HN [Cr] H N CI N H3 H XV-15
Co H3 N N H3 NH3 NH3 H3N H3N Co H3 N Cl NH3 NH3 H3N H3N Co H3 N N H3 Cl Cl H3N H3N Co H3 N N H3 Cl NH3 H3N Cl [Cl- 3] [Cl- 2] [Cl- ] [Cl- ] [ [ [ [ ] ] ] ] Inner Sphere vs Outer Sphere Coordination XV-15