36 Coordination Cmpds

36 Coordination Cmpds - Electron Configurations with [Ar]...

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1 1 Electron Configurations with [Ar] core [Ar] = 1s 2 2s 2 2p 6 3s 2 3p 6 Zn Cu Ni Co Fe Mn Cr V Ti Sc 3d 1 4s 2 3d 2 4s 2 3d 3 4s 2 3d 5 4s 1 3d 5 4s 2 3d 6 4s 2 3d 7 4s 2 3d 8 4s 2 3d 10 4s 1 3d 10 4s 2 What is the electron configuration of the Co 2+ ion? A)[Ar]3d 7 4s 0 B)[Ar]3d 5 4s 2 C)[Ar]3d 6 4s 1 D)[Ar]3d 7 4s 2 E)[Ar]3d 5 4s 0 How many unpaired electrons are there in the Co 2+ ion? A) 1 B) 2 C) 3 D) 4 E) 5 2 Cl Structure of Coordination Compounds Cl Cl Cl The coordination compound [Ni(NH 3 ) 6 ]Cl 2 dissociates into a complex ion and chloride counter ions in aqueous solution. The complex ion consists of a metal and ligands . Ammonia (NH 3 ) is the ligand in this example. The Ni – N bond is coordinate covalent . Hence the name coordination compound.
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2 3 Cl Cl Cl Cl The coordination number is the number of ligands bonded to the metal. In this case 6, and the structure is octahedral . The number of counter ions is determined by the charge on the complex ion. In this case, +2. The oxidation number of the metal is determined from the following relationship: oxidation number of the metal = charge on the complex ion + charge on the ligands 4 p. 1090 Not all coordination compounds involve complex ions, e.g. cisplatin . Cisplatin is an effective anti-cancer agent because one side can hydrogen bond to cell membranes and proteins.
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3 5 Some ligands can form 2 or more bonds to the same metal atom. These ligands are called bidentate (2), polydentate (many), or chelating ligands . Dentate comes from the Latin dentis for tooth . Chelate comes from the Greek chele for claw .
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36 Coordination Cmpds - Electron Configurations with [Ar]...

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