Coordination CompoundHard
Question
Tetrahedral complexes are generally favoured :
Options
A.where the ligands are bulky
B.when the ligands are stronger
C.where the electronic configuration of the central metal is d0 d5 or d10 (with weak field ligands) as there is no CFSE.
D.when the central metal ion has pseudo noble gas electron configuration, i.e. (n-1) d10ns0np0.
Solution
Tetrahedral complexes are favoured by steric requirements, either simple electrostatic repulsion of charge ligands or vander wall′s repulsions of large one.
Tetrahedral complexes are thus generally favoured by large ligands like Cl-, Br-, I- and PPh3 and metal ions of three types ;
(1) those with a noble gas configuration such as Be2+ (nso) ;
(2) those with pseudo noble gas configuration (n-1)d10 ns0np0, such as Zn2+, Cu+ and Ga3+, and
(3) those transition metal ions which do not strongly favour other structure by virtue of the CFSE, such as Co2+, d7.
Tetrahedral complexes are thus generally favoured by large ligands like Cl-, Br-, I- and PPh3 and metal ions of three types ;
(1) those with a noble gas configuration such as Be2+ (nso) ;
(2) those with pseudo noble gas configuration (n-1)d10 ns0np0, such as Zn2+, Cu+ and Ga3+, and
(3) those transition metal ions which do not strongly favour other structure by virtue of the CFSE, such as Co2+, d7.
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