请高手翻译一段化学文献，谢谢！！急用！！
3.4.ElucidatingthepossibleoxidationofSn2+withinSn–HEDPandSn–PEI-MPcomplexesThereweren...
3.4. Elucidating the possible oxidation of Sn2+ within Sn–HEDP and Sn–PEI-MP complexes
There were no changes in the 31P NMR spectra of samples of Sn(II) with HEDP or PEI-MP overnight, hence we can assume that no oxidation of Sn2+ occurred. Should this have been the case we would expect an increase in the ratio of intensities of the corresponding peaks, which would eventually approach the spectrum of the concerning Sn(IV)-complex at the respective pH.
In a study to understand the conditions needed for the oxidation of Sn2+ in the presence of HEDP, the complex was titrated with hydrogen-peroxide (30% H2O2). The metal to ligand ratio of 1:3 (pH 7.3) was chosen so as to limit any free/uncomplexed tin which would hydrolyze and precipitate out during the titrations. Throughout the investigation no precipitation was observed within the 1:3 mixtures, even over prolonged periods, which indicates that all tin was successfully complexed in solution and variations in the pH did not influence the Sn-ions directly–the [Sn–HEDP] complexes are stable enough to with-stand fluctuations in pH. Mixtures in which the metalion concentration was in excess, i.e. M:L > 1:1, exhibited immediate precipitation upon addition of NaOH. Precipitation eventually occurred in these solutions, even without any pH manipulation after a few hours – for both Sn2+ and Sn4+.
Oxidation of the tin in the [Sn(II)–HEDP]0 and the [Sn(II)–Sn(IV)–PEI-MP]4+ systems was induced by the addition of 30 μl ofH2O2, 0.05 mol/L(Fig. 9) and 0.010 mol/L(Fig. 8) respectively. As expected, an increase in intensity of the resonances of the Sn(IV) complexes was observed in the case of HEDP, with a steady decrease in the intensity of the resonance at about 19 ppm, and for PEI-MP we observed the disappearance of the signal for the Sn(II) chelate, although only realizing some increase ( 35–45%) in intensity of the resonances for the Sn4+ complex. There is a increase in the free-ligand concentration ( 40– 55%), which could be due to the liberation of ligand that had been previously bound to Sn2+.The simultaneous increase in both amounts of [Sn(IV)–PEI-MP]2+ and free ligand after oxidation implies that the PEI-MP that had formerly been bound to Sn2+ is evenly distributed between Sn4+-bound and free ligand in solution. Furthermore, this would mean an increase in the free metal-ion concentration (i.e. at least half the tin-ions being released as reflected by the increase in free-ligand concentration). This is confirmed by the occurrence of slight precipitation upon completion of the oxidation driven by thereaction of Sn(IV) + 4OH-=Sn(OH)4(s). Approximately 1.6μmol of H2O2 per μmol of Sn2+ within the HEDP system, was needed to oxidize it in order to reach the equivalent complexation of Sn4+ at the same pH (Fig. 9). For the [Sn(II)–PEI-MP]0 system 1.4μmol H2O2 per μmol Sn(II)–PEI-MP is needed. 展开
There were no changes in the 31P NMR spectra of samples of Sn(II) with HEDP or PEI-MP overnight, hence we can assume that no oxidation of Sn2+ occurred. Should this have been the case we would expect an increase in the ratio of intensities of the corresponding peaks, which would eventually approach the spectrum of the concerning Sn(IV)-complex at the respective pH.
In a study to understand the conditions needed for the oxidation of Sn2+ in the presence of HEDP, the complex was titrated with hydrogen-peroxide (30% H2O2). The metal to ligand ratio of 1:3 (pH 7.3) was chosen so as to limit any free/uncomplexed tin which would hydrolyze and precipitate out during the titrations. Throughout the investigation no precipitation was observed within the 1:3 mixtures, even over prolonged periods, which indicates that all tin was successfully complexed in solution and variations in the pH did not influence the Sn-ions directly–the [Sn–HEDP] complexes are stable enough to with-stand fluctuations in pH. Mixtures in which the metalion concentration was in excess, i.e. M:L > 1:1, exhibited immediate precipitation upon addition of NaOH. Precipitation eventually occurred in these solutions, even without any pH manipulation after a few hours – for both Sn2+ and Sn4+.
Oxidation of the tin in the [Sn(II)–HEDP]0 and the [Sn(II)–Sn(IV)–PEI-MP]4+ systems was induced by the addition of 30 μl ofH2O2, 0.05 mol/L(Fig. 9) and 0.010 mol/L(Fig. 8) respectively. As expected, an increase in intensity of the resonances of the Sn(IV) complexes was observed in the case of HEDP, with a steady decrease in the intensity of the resonance at about 19 ppm, and for PEI-MP we observed the disappearance of the signal for the Sn(II) chelate, although only realizing some increase ( 35–45%) in intensity of the resonances for the Sn4+ complex. There is a increase in the free-ligand concentration ( 40– 55%), which could be due to the liberation of ligand that had been previously bound to Sn2+.The simultaneous increase in both amounts of [Sn(IV)–PEI-MP]2+ and free ligand after oxidation implies that the PEI-MP that had formerly been bound to Sn2+ is evenly distributed between Sn4+-bound and free ligand in solution. Furthermore, this would mean an increase in the free metal-ion concentration (i.e. at least half the tin-ions being released as reflected by the increase in free-ligand concentration). This is confirmed by the occurrence of slight precipitation upon completion of the oxidation driven by thereaction of Sn(IV) + 4OH-=Sn(OH)4(s). Approximately 1.6μmol of H2O2 per μmol of Sn2+ within the HEDP system, was needed to oxidize it in order to reach the equivalent complexation of Sn4+ at the same pH (Fig. 9). For the [Sn(II)–PEI-MP]0 system 1.4μmol H2O2 per μmol Sn(II)–PEI-MP is needed. 展开
展开全部
3.4. 阐明那里Sn2+在Sn-HEDP之内和Sn PEIMP复合体的可能的氧化作用是在Sn样品31P核磁共振光上的没有变化(II)与隔夜HEDP或PEI-MP，因此我们可以假设， Sn2+的氧化作用没有发生。 如果这是实际情形我们会期待在对应的峰顶的强度比率的增量，最终将接近有关的Sn (IV)的光谱-复合体在各自pH。 在研究了解条件为Sn2+的氧化作用需要在HEDP面前，复合体滴定了与氢过氧化物(30%水2)。 金属到ligand比率1:3 (酸碱度7.3)被选择以便限制所有自由或uncomplexed在滴定法期间，将水解并且沉淀的锡。 在调查中降雨雪未在1:3混合物，甚而长时间之内被观察，表明所有锡成功地是complexed在解答，并且在酸碱度上的变化没有在Sn离子directly-the的fluence [Sn-HEDP]复合体是足够稳定的承受fluctuations在pH。 metalion集中是过份的混合物，即。 M ：L > 1:1，被陈列的直接降雨雪在NaOH的加法。 降雨雪在这些解答最终发生了，甚而，不用任何酸碱度操作在几个小时以后-为Sn2+和Sn4+。 锡在[Sn (II) - HEDP] 0和[Sn (II) - Sn (IV) - PEI-MP] 4+系统的氧化作用被30 μl导致ofH2O2， 0.05 mol/L的加法(。 9) 并且0.010 mol/L (。 8) 分别。 预期，在Sn (IV)复合体的共鸣的强度的增量被观察了在HEDP情况下，以在共鸣的强度的平稳的减退在大约19 ppm，并且为我们对Sn的PEI-MP (II)螯合观察信号失踪，虽然只体会一些增加(35-45%)在共鸣的强度为Sn4+复合体。 有在无ligand集中的增量(40 - 55%)，可能归结于ligand解放早先一定到在两相当数量的Sn2+.The同时增量[Sn (IV) - PEI-MP] 2+，并且自由ligand，在氧化作用暗示之后以前一定对Sn2+在解答均匀地被分布在之间Sn4+跳起并且释放ligand的PEI-MP。 此外，这将意味在自由金属离子集中的增量(即。 一半被发布的至少锡离子，关于fl由在无ligand集中的增量ected)。 这是精读fi由轻微的降雨雪发生rmed在Sn (IV)的thereaction驾驶的氧化作用的完成+ 4OH-=Sn (OH) 4 (s)。 水2近似地1.6μmol每Sn2+ μmol在HEDP系统之内，是需要的氧化它为了到达Sn4+的等效络合在同样酸碱度(。 9). 为[Sn (II) - PEI-MP] 0系统1.4μmol水2每μmol Sn (II) - PEI-MP是需要的。
已赞过
已踩过<
评论
收起
你对这个回答的评价是？
展开全部
3.4 。澄清可能的氧化sn2 +内部锡hedp和SN -培国会议员配合
有没有变化，在核磁共振磷谱谱的样本锡（二）与hedp或培国会议员在一夜之间，因此，我们可以假定没有氧化sn2 +发生。应本已如此，我们预期在增加的比例，强度相应的高峰期，这将最终办法频谱的关于锡（四） -复杂的，在各自的pH值。
在一项研究，以了解所需的条件氧化sn2 +在在场的hedp ，复杂的是滴定氢过氧化物（ 30 ％过氧化氢） 。金属配位体的比例1:3 （ pH值7.3 ）被选为以便限制任何免费/ uncomplexed田将水解和沉淀在滴定法。在整个调查没有降水，观察内部的1:3的混合物，甚至超过长时间，这表明，所有田成功复合溶液中和变化，在pH值不影响锡离子直接[锡hedp ]复合是不够稳定，以与站的波动， pH值。混合物在其中金属离子浓度在过剩，即米：升> 1时01分，展示即时沉淀后，加入氢氧化钠。降水最终发生在这些解决方案，即使没有任何pH值操纵在数小时后-双方s n2+和s n4+ 。
氧化锡在[锡（二） - hedp ] 0和[锡（二） -锡（四） -培国会议员] 4 +系统诱导增加3 0μ升o fh2o2， 0 .05m ol/ L的（图9 ）和0.010 mol / L的（图8 ）分别。一如所料，增加在强度的共振锡（四）配合观察，在案件hedp ，稳步下降，在强度的共振，在约19 ppm ，使用和培国会议员，我们观察到的消失信号为锡（二）螯合，虽然只实现了一些增加（ 35-45 ％ ），强度的共振为sn4 +复杂。是有增加，在自由配体的浓度（ 40 -5 5％ ） ，这可能是由于解放配体已被先前的约束，以s n2+ 。同时，增加在这两个数额[锡（四） -培国会议员] 2 +和自由配体氧化后，意味着该培国会议员认为，以前的约束，以sn2 +是均匀分布之间的sn4 + -约束和自由配体的解决方案。此外，这将意味着增加，在自由金属离子浓度（即至少有一半是锡离子被释放所反映的增加，在自由配体的浓度）。证实了这一点发生轻微沉淀完成后，氧化驱动thereaction锡（四） + 4oh - =锡（哦） 4 （ ） 。大约1.6 μ mol过氧化氢％ μ mol的sn2 +内部hedp系统，需要氧化它，以达到相等于络合的sn4 +在同一pH值（图9 ） 。为[锡（二） -培国会议员] 0系统1.4 μ
参考
有没有变化，在核磁共振磷谱谱的样本锡（二）与hedp或培国会议员在一夜之间，因此，我们可以假定没有氧化sn2 +发生。应本已如此，我们预期在增加的比例，强度相应的高峰期，这将最终办法频谱的关于锡（四） -复杂的，在各自的pH值。
在一项研究，以了解所需的条件氧化sn2 +在在场的hedp ，复杂的是滴定氢过氧化物（ 30 ％过氧化氢） 。金属配位体的比例1:3 （ pH值7.3 ）被选为以便限制任何免费/ uncomplexed田将水解和沉淀在滴定法。在整个调查没有降水，观察内部的1:3的混合物，甚至超过长时间，这表明，所有田成功复合溶液中和变化，在pH值不影响锡离子直接[锡hedp ]复合是不够稳定，以与站的波动， pH值。混合物在其中金属离子浓度在过剩，即米：升> 1时01分，展示即时沉淀后，加入氢氧化钠。降水最终发生在这些解决方案，即使没有任何pH值操纵在数小时后-双方s n2+和s n4+ 。
氧化锡在[锡（二） - hedp ] 0和[锡（二） -锡（四） -培国会议员] 4 +系统诱导增加3 0μ升o fh2o2， 0 .05m ol/ L的（图9 ）和0.010 mol / L的（图8 ）分别。一如所料，增加在强度的共振锡（四）配合观察，在案件hedp ，稳步下降，在强度的共振，在约19 ppm ，使用和培国会议员，我们观察到的消失信号为锡（二）螯合，虽然只实现了一些增加（ 35-45 ％ ），强度的共振为sn4 +复杂。是有增加，在自由配体的浓度（ 40 -5 5％ ） ，这可能是由于解放配体已被先前的约束，以s n2+ 。同时，增加在这两个数额[锡（四） -培国会议员] 2 +和自由配体氧化后，意味着该培国会议员认为，以前的约束，以sn2 +是均匀分布之间的sn4 + -约束和自由配体的解决方案。此外，这将意味着增加，在自由金属离子浓度（即至少有一半是锡离子被释放所反映的增加，在自由配体的浓度）。证实了这一点发生轻微沉淀完成后，氧化驱动thereaction锡（四） + 4oh - =锡（哦） 4 （ ） 。大约1.6 μ mol过氧化氢％ μ mol的sn2 +内部hedp系统，需要氧化它，以达到相等于络合的sn4 +在同一pH值（图9 ） 。为[锡（二） -培国会议员] 0系统1.4 μ
参考
本回答被提问者采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是？
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
