Question

Looking for answers to a and c; letter b is omitted.

Comment on the following observations. (a) In its complexes, Co(III) forms strong bon O- and N-donor ligands, moderately strong bonds -donor ligands, but only weak bonds to As-donor ligands.

Answer 1

The answer is given in the attachment.

a> The answer can be given by the Pearson's Hand-Soff and bace (HSAB) theory. According to this, cohioms awo acids famions are base, And the key line is 'Hard Hand ļ Self-Suff interactions are favoured. Hard Acid small size , high charge density. Thus, Colit) is hard and centre . . of N has small size thus they are hand bases. P is bully & moderate anion. As is even small change density & soff base Thus, Co-N, Co-o s vergthong, Cop moderate, - Co-As weak. by Crlift) high charge density hand and spoor interation Phosphine - p-donor ligan'da 3 poft bonuke 4-spoor interaction long bond. por band chengine