wk3c- coord chem
DESCRIPTION
KOORDINASI (ANORGANIK)TRANSCRIPT
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• Coordination compounds are derived from simpler compounds that are joined together, or coordinated.
Coordination Chemistry
• The two compounds have very similar formulas but are very different in appearance because of the different chemical structures.
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• A complex consists of a central atom, which is usually a metal atom or ion, and attached groups called ligands.
• The region surrounding the central atom or ion and containing the ligands is called the coordination sphere.
• The coordination number is the total number of points at which a central atom or ion has ligands attached.
• A complex that carries a net electric charge is called a complex ion.
• A substance consisting of one or more complexes is called a coordination compound.
Some Terminologyfor Complexes
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Nomenclature
Rules for Coordination Compounds: • neutral compound• ionic cation before anion
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LigandsNeutral Molecules• water → aqua• ammonia → amine• ethylenediamine (en)• pyridine (py)• 1,10-phenanthroline (phen)• 2,2'-bipyridine (bipy)• 4,4'-bipyridine• triphenylphosphine
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Ligands
Anions:• F-→ fluoro• Cl- → chloro• Br- → bromo• I-→ iodo• O-2 → oxo• OH- → hydroxo• CN- → cyano
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Ligands
Anions• HSO3
- => bisulfito• H- => hydrido• C6H5
- => phenyl (ph)• C5H5
- => cyclopentadienyl• CO3
-2 => carbonato
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Multiplicity
monodentate• mono → 1• di → 2• tri → 3• tetra → 4• penta → 5• hexa → 6
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Multiplicity
bi- or tri- dentate• bis → 2• tris → 3• tetrakis → 4
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Special Bonding Conditions
• Bridging units → μ• Delocalized bonding → η
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Coordination Sphere Nomenclature
Cationic coordination sphere– -ium ending
Anionic coordination sphere– -ate ending
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Nomenclature
Neutral molecule[Ru(NH3)4(HSO3)2]
bis(bisulfite)tetraamineruthenium(II)
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Nomenclature
Anionic coordination sphereK3[Fe(CN)6]
potassium hexacyanoferrate(III)
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Nomenclature
Cationic coordination sphere[Cu(NH3)4]SO4
tetraaminecopper(II) sulfate
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Nomenclature
Cationic coordination sphere & Anionic coordination sphere[Ti(H2O)6][CoCl6]hexaaquatitanium(III) hexachlorocobaltate(III)
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Position Numbering
1
5-----2M
4-----3
6
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Isomerism
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Geometric Isomerism
• cis → 2 adjacent ligands• trans → 2 ligands across the center of
coordination sphere
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cis and transGeometric Isomerism
[PtCl2(NH3)2]
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Linkage Isomerism
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Ionizational Isomerism
[CoIII(NH3)5Br]SO4
[CoIII(NH3)5SO4] Br
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Coordination Isomerism
[CrIII(H2O)6][CoIIICl6]
[CoIII(H2O)6][CrIIICl6]
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Optical Isomerism
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3 Theories :
VBT, CFT, MOT
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