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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Subtle ligand/media effects. Modulation of cis/trans isomerism in hydrogen peroxide oxidation of Pt(II) to Pt(IV) complexes
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Subtle ligand/media effects. Modulation of cis/trans isomerism in hydrogen peroxide oxidation of Pt(II) to Pt(IV) complexes

机译:精细的配体/介质效应。 Pt(II)过氧化氢氧化为Pt(IV)配合物时顺式/反式异构体的调节

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The modulation of cis/trans isomerism on the oxidation of Pt~(II) to Pt~(IV ) via subtle ligand/media effects has been established. The reaction of [Pt~(II)(O-O)(dpda)] (O-O = 1,1-cyclobutanedicarboxylate (cbdc),dibenzylmalonate (dbm); dpda = 2,2-dimethyl-1,3-propanediamine) with hydrogen peroxide in acetic acid produces cis-[Pt~(IV)(O_2CCH_3)_2(O-O)(dpda)], while the reaction in acetic anhydride gives trans-[Pt~(IV)(O_2CCH_3)_2(O-O)(dpda)]. The crystal structures of cis-[Pt~(IV)(O_2CCH_3)_2(cbdc)(dpda)] (orthorhombic Pbca, a = 11.148(2) A, b = 14.188(5) A, c = 23.425(3) A, V = 3705(2) A~3, Z = 8, R = 0.0525) and trans-[Pt~(IV)(O_2CCH_3)_2(cbdc)(dpda)]·3H_2O (monoclinic P2_1/c, a = 11.479(2) A, b = 13.426(3) A, c = 14.640(5) A, beta = 108.73(2) deg, V = 2136.8(9) A~3, Z = 4, R = 0.0251) have been solved and refined. The AcO-Pt-AcO angle (87.4(5) deg) of the cis isomer presents a striking contrast to that (172.5(1) deg) of the trans isomer. The trans isomer is retained in aqueous solution, but the cis isomer is very slowly converted to the trans isomer in both water and acetic acid.
机译:已经建立了通过精细的配体/介质效应对Pt〜(II)氧化为Pt〜(IV)的顺式/反式异构体的调节。 [Pt〜(II)(OO)(dpda)](OO = 1,1-环丁烷二羧酸酯(cbdc),丙二酸二苄基丙二酸酯(dbm); dpda = 2,2-二甲基-1,3-丙二胺)与过氧化氢的反应在乙酸中生成顺式[[Pt〜(IV)(O_2CCH_3)_2(OO)(dpda)],而在乙酸酐中反应生成反式-[Pt〜(IV)(O_2CCH_3)_2(OO)(dpda)] 。顺式-[Pt〜(IV)(O_2CCH_3)_2(cbdc)(dpda)]的晶体结构(斜方晶系Pbca,a = 11.148(2)A,b = 14.188(5)A,c = 23.425(3)A ,V = 3705(2)A〜3,Z = 8,R = 0.0525)和反式-[Pt〜(IV)(O_2CCH_3)_2(cbdc)(dpda)]·3H_2O(单斜晶P2_1 / c,a = 11.479)。 (2)A,b = 13.426(3)A,c = 14.640(5)A,beta = 108.73(2)deg,V = 2136.8(9)A〜3,Z = 4,R = 0.0251)已求解和精致。顺式异构体的AcO-Pt-AcO角(87.4(5)度)与反式异构体的AcO-Pt-AcO角(172.5(1)度)形成鲜明对比。反式异构体保留在水溶液中,但是顺式异构体在水和乙酸中都非常缓慢地转化为反式异构体。

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