please help me with a correct answer for self-test 5.7 EXAMPLE 5.7 Interpreting
ID: 588351 • Letter: P
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please help me with a correct answer for self-test 5.7
EXAMPLE 5.7 Interpreting potential data to identify bonding trends in complexes Ruthenium is located immediately below iron in the periodic table. The following reduction potentials have been measured for species of Ru in aqueous solution. What do these values suggest when compared to their Fe counterparts ? [Ru(CNU'-+ e- [Ru(CN)6]4- E* = +0.85V Answer We can answer this question by noting that if complexation by a certain ligand causes the reduction potential of a metal ion to shift in a positive direction, then the new ligand must be stabilizing the reduced metal ion. In this case we see that CN stabilizes Ru(Il) with respect to Ru(lI) This behaviour is in stark contrast to the behaviour of Fe (see the preceding brief illustration) where we noted that CN stabilizes Fe(II), a result more in keeping with Fe-CN bonds being more ionic. The contrasting effects for species having identical charges suggest that the bonding between CN and RulI) is particularly strong Self test 5.7 The ligand bpy (1) forms complexes with Felll) and Fel(l), The standard potential of the [Fe(bpy),J3 /1Fe(bpy),]P couple is + 102 V. Does bpy bind preferentially to Fel(ll) or Fell? 1 2.2 -bipyridine (bpy)Explanation / Answer
Sol . Since reductive potential is positive(+1.02V) so bipyridine ligand stabilises the
reduced iron that is Fe(II) so the ligand bpy bind preferentially to Fe(II).
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