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- W2075642766 abstract "Pseudo-square-planar platinum(II) complexes containing 4,4′ (4,4′-Me 2 bipy), 5,5′ (5,5′-Me 2 bipy) and 6,6′ (6,6′-Me 2 bipy) isomers of dimethyl-2,2′-bipyridine (Me 2 bipy) were synthesized and structurally characterized to assess the effects of methyl-group position on structure. The Pt—N distances in (Me 2 bipy)PtCl 2 complexes fall in the typical range [2.017 (3)–2.032 (3) Å]. Only minor distortions such as 2.4 and 5.5° twisting of the two pyridyl rings in (4,4′-Me 2 bipy)PtCl 2 (I) and (5,5′-Me 2 bipy)PtCl 2 (II), respectively, occur. However, (6,6′-Me 2 bipy)PtCl 2 (III) is highly distorted: the two pyridyl rings in (III) have a large bowing angle (θ B ) of 19.2°. The presence of distortions in (III), but not in (I) and (II), is attributed to repulsions between the 6,6′-methyl groups and the cis chloro ligands. [(4,4′-Me 2 bipy) 2 Pt](BF 4 ) 2 (IV) undergoes a bow-incline deformation having a large θ B value (24.2°), and the ligands are inclined relative to the coordination plane by 18.80 (13)°. Complex (IV) joins a small list of distorted bis-bipyridine complexes; this finding can be attributed to the unfavorable repulsions between the 6,6′ hydrogen substituents of opposing ligands. Some of these complexes exhibit canting rather than bow-incline distortion, a trend suggesting that subtle solid-state effects determine the nature of the distortion." @default.
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- W2075642766 date "2007-07-17" @default.
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- W2075642766 title "Ligand and coordination-plane distortions in platinum(II) complexes of isomers of dimethyl-2,2′-bipyridine" @default.
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- W2075642766 doi "https://doi.org/10.1107/s0108768107027024" @default.
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