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SUBJECT-CHEMISTRY


                                        CHAPTER-COORDINATION COMPOUNDS


                          SUBTOPIC-Introduction, ligands, coordination number, IUPAC
                          nomenclature.

                    KEY NOTES:

                         The transition metals form a large number of complex compounds in
                          which the metal atoms are bound to a number of anions or neutral
                          molecules. In modern terminology such compounds are called
                          coordination compounds.
                         The number of ions or molecules surrounding the metal ion is called
                          the co-ordinate number of metal ion.
                         The species which can donate a pair of eletron to central metal atom
                          or  ion  during  the  formation  of  coordination  compound  is  called  a
                          ligand.
                         Ambidenote  ligand:  Ligands  which  can  link  through  two  different
                          atoms present in it are called ambidentate lignds.
                                    
                                          
                                 NO ,ONO
                                    2
                                     
                                          
                                  SCN ,NCS
                                       
                                          
                                    
                                       
                                  CN ,N C
                        Homoleptic  complexes-  complexes  contain  one  kind  of
                          ligands.
                        Heteroleptic compounds – complexes contain different types
                          of ligands.
                        Naming of complex or co-ordination compound.
                          (a) For  cotionic  complex:  ligands  +  metal  normal  name
                              (oxidation no.) + ion

                          (b)  For  compound  containing  complex  as  cation:  ligands  +
                              metal atom(oxidation no.)+anion.
                          (c) For  anionic  complex  :  ligands  +  metal  atom  (ate)  +
                              (oxidation no.) + ion

                          (d)  For  compound  containing  anionic  complex  :  cation  +
                              ligands + metal atom (oxidation no.)
                          (e) For neutral compound: lingad + metal atom (oxidation no.)
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