| Summary: | This review covers twenty four Pt(II) complexes of the inner coordination sphere Pt(κ<sup>3</sup>–P<sup>1</sup> N<sup>1</sup>N<sup>2</sup>)(Y), (Y = Cl, CL); Pt(κ<sup>3</sup>–P<sup>1</sup>N<sup>1</sup>X<sup>1</sup>)(Y), (X<sup>1</sup> = O<sup>1</sup> and Y = P<sup>2</sup>L, Cl, I); (X<sup>1</sup> = C<sup>1</sup> and Y = NL, Cl); (X<sup>1</sup> = S<sup>1</sup> and Y = Cl, I); (X<sup>1</sup> = Se<sup>1</sup> and Y = Cl); Pt(κ<sup>3</sup>–N<sup>1</sup>P<sup>1</sup>N<sup>2</sup>)(Cl), Pt(κ<sup>3</sup>–S<sup>1</sup>P<sup>1</sup>S<sup>2</sup>)(Cl), Pt(κ<sup>3</sup>–P<sup>1</sup>S<sup>1</sup>Cl<sup>1</sup>)(Cl) and Pt(κ<sup>3</sup>–P<sup>1</sup>Si<sup>1</sup>N<sup>1</sup>)(OL). These complexes are crystallized in three crystal classes: monoclinic (16 examples), triclinic (5 examples), and orthorhombic (3 examples). Each κ<sup>3</sup>–ligand creates two metallocyclic rings with various combinations of the respective metallocyclic rings. If the common central ligating atom is N<sup>1</sup>, the 5 + 5 membered, 5 + 5, 5 + 6, 6 + 5, and 6 + 6; if the common central ligating atom is P<sup>1</sup>: 5 + 5, and 6 + 6; if the common central ligating atom is S<sup>1</sup> or Si<sup>1</sup>, 5 + 6-membered. The structural parameters (Pt-L, L-Pt-L) are analysed and discussed with an attention to the distortion of a square-planar geometry about the Pt(II) atoms as well as trans-influence. The sums of the Pt-L (x = 4) bond distances the growing with the covalent radius of the Y atoms. Noticeably, the distortion of the square-planar geometry is growing with the decreasing size of the inner coordination sphere about the Pt(II) atom. There is a relation between the degree of distortion (Ʈ<sub>4</sub>) and the numbers of the metallocycles rings. The distortion diminishing is in the order of: 0.058 (5 + 5) > 0.037 (6 + 5) > 0.023 (5 + 6) > 0.022 (6 + 6) membered.
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