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Activation of Dioxygen by Dimethylplatinum(II) Complexes
Organometallics ( IF 2.5 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1021/acs.organomet.7b00614
Mahmood Azizpoor Fard 1 , Ava Behnia 1 , Richard J. Puddephatt 1
Affiliation  

The ligands RN(CH2-2-C5H4N)2 (L1, R = CH2CH2OH; L2, R = CH2CH2CH2OH; L3, R = 2-C6H4OH) have been designed to give dimethylplatinum(II) complexes that can activate dioxygen in the absence of a protic solvent. The ligands react with [Pt2Me4(SMe2)2] to give an equilibrium mixture, with the major constituent being [PtMe22-N,N′-L)] (1a, L = L1; 1b, L = L2; 1c, L = L3). In the absence of air, 1a reacts with solvent CH2Cl2 to give [PtMe2(CH2Cl)(κ3-N,N′,N″-L1]Cl, while 1c decomposes with loss of methane to give [PtMe(κ3-N,N′,N″-L3-H)] and then, by reaction with solvent, the binuclear complex [{PtMe(κ3-N,N′,N″-L3-H)}2(μ-H)]Cl. In the presence of oxygen the complexes 1 in CH2Cl2 solution react to give [Pt(OH)Me23-N,N′,N″-L)]Cl, when L = L1 or L2, or [Pt(OH)Me23-N,N′,O-L-H)], when L = L3. The complex [Pt(OH)Me23-N,N′,N″-L2)]Cl decomposed in the presence of air to give the binuclear complex [{PtMe2(2-C5H4NCO2)(μ-OH)}2]. The factors influencing reactivity and mechanism in these reactions are elucidated, and the presence of both a free pyridyl donor (push group) and a free hydroxyl (pull group) is suggested to give a synergy for dioxygen activation by dimethylplatinum(II) complexes.

中文翻译:

二甲基铂(II)配合物对双氧的活化

配体RN(CH 2 -2-C 5 H 4 N)2L1,R = CH 2 CH 2 OH; L2,R = CH 2 CH 2 CH 2 OH; L3,R = 2-C 6 H 4 OH )经设计可提供在没有质子溶剂的情况下可以激活双氧的二甲基铂(II)配合物。配体与[PT反应24(SME 22 ],得到的平衡混合物,主要的成分是[PTME 2(κ 2 -N,N'-L)](1aL = L11bL = L21cL = L3)。在无空气的,图1A与溶剂CH发生反应22,得到[PTME 2(CH 2 Cl)的(κ 3 - ÑÑ ',Ñ “ - L1 ]为氯,而图1C与甲烷的损失分解得到[ PTME(κ 3 - ññ ',ñ “ -L3 -H)],然后,通过与溶剂反应时,双核配合物[{PTME(κ 3 - ÑÑ ',Ñ “ - L3 -H)} 2(μ-H)]氯。在氧的存在下,复合物1在CH 22溶液反应,得到[PT(OH)Me 2(κ 3 - ÑÑ ',Ñ “ -大号)]氯,当大号= L1L2,或[的Pt(OH)Me 2(κ 3 - ññ ',ö-大号-H)],当大号= L3。络合物[铂(OH)Me 2(κ 3 - ÑÑ ',Ñ “ - L2)]氯分解在空气的存在下,得到双核络合物[{PTME 2(2-C 5 H ^ 4 NCO 2) (μ-OH)} 2 ]。阐明了影响这些反应的反应性和机理的因素,并提出了游离吡啶基供体(推基)和游离羟基(拉基)的存在可为二甲基铂(II)配合物的双氧活化提供协同作用。
更新日期:2017-11-04
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