Table 2.

Comparison of the catalytic activities between 1a and [{Pt(en)(H₂O)}₂(μ-pz)]⁴⁺ [35] and 3a and [{Pt(en)(H₂O)}₂(μ-pydz)]⁴⁺ [44] complexes in the hydrolysis of Ac–L–Met–Gly dipeptide.

Platinum(II) complex	Hydrolyzed Met-Gly amide bond (%)
	2 h	12 h	24 h
[{Pt(en)(H2O)}2(μ-qx)]4+ (1a)	35	52	60
[{Pt(en)(H2O)}2(μ-pz)]4+	60	85	88
[{Pt(en)(H2O)}2(μ-phtz)]4+(3a)	8	28	41
[{Pt(en)(H2O)}2(μ-pydz)]4+	12	36	54