Variable heterotridentate ligands in Pt(³-X¹C¹X²)(PL) (X^1,2 = N or S), Pt(³-X¹N¹Y¹)(PL) (X, Y = O, C; C, S; or O, S) and Pt(³-S¹B¹S²)(PL), derivatives - structural aspects

This review covers 17 Pt(II) complexes of the compositions: Pt(eta(3)-(NCN2)-C-1-N-1)(PL), Pt(eta(3)-(SCS2)-C-1-S-1)(PL), Pt(eta(3)-(SBS2)-B-1-S-1)(PL), Pt(eta(3)-(SSO1)-S-1-O-2)(PL), Pt(eta(3)-(ONC1)-N-1-C-1)(PL), Pt(eta(3)-(ONS1)-N-1-S-1)(PL) and Pt(eta(3)-(CNS1)-N-1-S-1)(PL). These complexes crystallized in three crystal classes: monoclinic (8 examples), triclinic (8 examples) and orthorhombic (1 example). The heterotridentate ligands creates 5 + 5-membered metallocyclic rings (most common) and 5 + 6-membered. The heterotridentate ligands with monodentate P ligands build up a distorted square-planar geometry about Pt(II) atoms. The Pt-L and L-Pt-L were analyzed. The tau(4) parameter which indicate a degree of distortion growing in the sentence: 0.057 Pt(eta(3)-(ONS1)-N-1-S-1)(PL) < 0.066 Pt(eta(3)-(SCS2)-C-1-S-1)(PL) < 0.149 Pt(eta(3)-(SSO1)-S-1-O-2)(PL) < 0.158 Pt(eta(3)-(ONC1)-N-1-C-1)(PL) < 0.160 Pt(eta(3)-(CNS1)-N-1-S-1)(PL) < 0.162 Pt(eta(3)-(SBS2)-B-1-S-1)(PL) < 0.165 Pt(eta(3)-(NCN2)-C-1-N-1)(PL).