910311-82-9Relevant academic research and scientific papers
Mono(2,6-dinitroaryl)platinum(II) and Mono- and Bis(2,6-dinitroaryl) platinum(IV) Complexes
Vicente, Jose,Arcas, Aurelia,Galvez-Lopez, Maria-Dolores,Jones, Peter G.,Bautista, Delia
, p. 3501 - 3517 (2009/12/06)
cis-[Pt(κ2-Ar)(κ1-Ar)(OH2)] (κ2-Ar) κ2C, O-C6(NO 2)2-2,6-(OMe)3, κ1Ar) κ C-C6(NO2)2-2,6-(OMe)3) reacts either (1) with hydrochloric acid (1:1) to afford cis - and trans- [Pt(κ2-Ar)(μ-Cl)]2 (1a) and C 6H(NO2)2-2,6-(OMe)3 (HAr) or (2) with MeC(O)X (1:1) in the presence of atmospheric moisture to give 1a or 1b (X) Br). These complexes react (1) with bidentate ligands to afford [Pt(κ1-Ar)X(L ∧ L)] (X) Cl, L ∧ L) bpy (2a); X) Br, L ∧ L) 1,5-cyclooctadiene (cod; 2b), norbornadiene (nbd; 2c)), (2) with Tl(acac) to give [Pt(κ2-Ar)(acac-κ2O, O)] (3), and (3) with monodentate neutral ligands to render complexes resulting from bridge splitting or/and cleavage of the Pt - O bond ([Pt(κ1-Ar) BrL2](L) MeCN (4a), XyNC (Xy) C6H3Me 2-2,6; 4b), [Pt(κ2-Ar)BrL] (L) MeCN (5a), XyNC (5b), CO (5c)), [Pt(κ1-Ar)(μ-X)L]2 (X) Br, L) 3-hexyne (6a), ethylene (6b), styrene (6c); X) Cl, L) PPh3 (6d)), depending on the nature of the ligand and the molar ratio of the reagents. Complex 6d reacts (1) with monodentate neutral ligands to give [Pt(κ1-Ar) Cl(PPh3)L] (L) PPh3 (7), SMe2 (8a), CO (8b), XyNC (8c1)), (2) with Tl(acac) to afford [Pt(κ1-Ar)(acac- κ2O, O)(PPh3)] (9), (3) with (PPN)Cl to render anionic (PPN)[Pt(κ1-Ar)Cl2(PPh3)] (PPN · 10), or (4) with bpy leading to cationic [Pt(κ1-Ar) (bpy)(PPh3)]Cl (11 · Cl). If 1 equiv of bpy is used in the latter reaction, the intermediate [Pt(κ1-Ar)(bpy)(PPh 3)][Pt(κ1-Ar)Cl2(PPh3)] (11 · 10) is obtained. The reaction of excess Cl2 with cis-[Pt(κ2-Ar)(κ1-Ar)(H2O)] or trans-[Pt(κ2-Ar)(κ2-Ar)(CO)] gives (OC-6-32)-[Pt(κ2-Ar)2Cl2](12)or(OC-6-22)- [Pt(κ2-Ar)2Cl2](13), respectively. Complex 13 gradually transforms in solution into 12. The dimer 6d reacts with 3 equiv of PhICl2 to afford fac-[Pt(κ2-Ar)Cl 3(PPh3)] (14). AgClO4 reacts with complex 12, leading to (OC-6-32)-[Pt(κ2-Ar)2(OH 2)2](ClO4)2 · Et 2O(15 · Et2O). Complex 12 reacts with 1 equiv of PPh3 to afford cis-[Pt(κ2-Ar)(κ1- Ar)PPh3] or with AsPh3, leading to cis- [Pt(κ2-Ar)(κ1-Ar)AsPh3](16, 2:1 molar ratio) or (AsPh3OH)[Pt(κ2-Ar) (κ1-Ar)Cl] (17) (1:1 molar ratio). X-ray crystal structures of HAr and complexes 2a · CH2Cl2, 2c, 3, 5a, trans - 6b, trans - 6c · CDCl3, trans - 7 · Et2O, 8a, 8c, 9, 11 · 10 · 2CHCl3, 12, 13, 16 · CHCl3, and 17 have been determined.
Bis(2,6-dinitroaryl)platinum(II) complexes. Cis/trans isomerization
Vicente, Jose,Arcas, Aurelia,Galvez-Lopez, Maria-Dolores,Jones, Peter G.
, p. 4247 - 4259 (2008/10/09)
The complexes cis-[Pt(κ2-Aryl)(κ1-Aryl)L] (κ2-Aryl = κ2-(C,O)-C6(NO 2)2-2,6-(OMe)3, κ1-Aryl = κ1-(C)-C6(NO2)2-2,6-(OMe) 3, L = S-dmso (2cis), XyNC (4cis; Xy = 2,6-Me2C 6H4), CO (5cis), PPh3 (7cis)) have been obtained by reacting at room temperature cis-[Pt(κ2-Aryl) (κ1-Aryl)(OH2)] (1cis) with dimethyl sulfoxide (dmso; 1:1 or excess), XyNC (1:1), or CO (excess) or cis-(Me4N) [Pt(κ2-Aryl)(κ1-Aryl)Cl] with PPh3 (1:1), respectively. The room-temperature reaction of 1cis with XyNC (1:2), of 5cis with PPh3 (1:1), or of cis-(Me4N) [Pt(κ2-Aryl)(κ1-Aryl)Cl] with PPh3 (1:2) gives cis-[Pt(κ1-Aryl)2LL′] (L = L′ = XyNC (3cis), PPh3 (8cis); L = CO, L′ = PPh 3 (6cis)). Complexes 3cis, 4cis, and 5cis isomerize on heating in solution or in the solid state to give 3trans, 4trans, and 5trans, respectively, while 6cis and 8cis decompose to give 7cis instead of their trans isomers; these, however, can be prepared by reacting 5trans or 6trans with PPh 3 in molar ratios of 1:1 or 1:2, respectively. When they are heated, 6trans and 8trans also descompose to 7cis, while 2cis and cis- [Pt(κ2-Aryl)(κ1-Aryl)L] (L = H2O (1cis), PhCN, tht) decompose to a mixture of unidentified products (1cis) or are recovered unchanged. These results, and others reported in the literature, on the stability of cis- and trans-diaryl complexes of platinum or palladium can be explained as the result of two competing factors, transphobia and the steric requirements of the ligands. The X-ray crystal structures of 2cis, 3cis, 3trans, 4trans·CHCl3, 5cis·CH2Cl2, 5cis·0.Shexane, 6cis, 6trans·CHCl3, 7cis-Me 2CO, and 8trans·0.5CHCl3 have been determined.
