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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Triazenide-bridged rhodium-palladium complexes: [I_2Rh(mu-p-MeC_6H_4NNNC_6H_4Me-p)_2Pd(eta~3-C_3H_5)]~-,a stable paramagnetic [RhPd]~(4+) species with a localised Rh(II) centre
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Triazenide-bridged rhodium-palladium complexes: [I_2Rh(mu-p-MeC_6H_4NNNC_6H_4Me-p)_2Pd(eta~3-C_3H_5)]~-,a stable paramagnetic [RhPd]~(4+) species with a localised Rh(II) centre

机译:三氮烯桥铑-钯配合物:[I_2Rh(mu-p-MeC_6H_4NNNC_6H_4Me-p)_2Pd(eta〜3-C_3H_5)]〜-,具有局部Rh(II)的稳定顺磁性[RhPd]〜(4+)物种中央

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摘要

Deprotonation of mixtures of the triazene complexes [RhCl(CO)_2(p-MeC_6H_4NNNHC_6H_4Me-p)] and [PdCl(eta~3-C_3H_5)(p-MeC_6H_4NNNHC_6H_4Me-p] or [PdCl_2(PPh_3)(p-MeC_6H_4NNNHC_6H_4Me-p)] with NEt,gives the structurally characterised heterobinuclear triazenide-bridged species [(OC)_2Rh(mu-p-MeC_6H_4NNNC_6H_4Me-p)_2PdLL'] {LL' = eta~3-C_3H_5 1 or Cl(PPh_3) 2} which,in the presence of Me_3NO,react with [NBu~n_4]I,[NBu~n_4]Br,[PPN]Cl or [NBu~n_4]NCS to give [(OC)XRh(mu-p-MeC_6H_4NNN-C_6H_4Me-p)_2PdCl(PPh_3)]~- (X = I 3~-,Br 4~-,Cl 5~- or NCS 6~-) and [NBu~n_4][(OC)XRh(mu-p-MeC_6H_4-NNNC_6H_4Me-p)_2Pd(eta~3-C_3H_5)],(X = I 7~- or Br 8~-).The allyl complexes 7~- and 8~- undergo one-electron oxidation to the corresponding unstable neutral complexes 7 and 8 but,in the presence of the appropriate halide,oxidative substitution results in the stable paramagnetic complexes [NBu~n_4][X_2Rh(mu-p-MeC_6H_4NNNC_6H_4Me-p)_2Pd(eta~3-C_3H_5)],(X = 19~- or Br 10~-).X-Ray structural (9~-),DFT and EPR spectroscopic studies are consistent with the unpaired electron of 9~- and 10~- localised primarily on the Rh(II) centre of the [RhPd]~(4+) core,which is susceptible to oxygen coordination at low temperature to give Rh(III)-bound superoxide.
机译:三嗪配合物[RhCl(CO)_2(p-MeC_6H_4NNNHC_6H_4Me-p)]和[PdCl(eta〜3-C_3H_5)(p-MeC_6H_4NNNHC_6H_4Me-p]或[PdCl_2(H_4_6_H_4_P) )]与NEt结合,得到结构特征性的异双核三叠氮化物桥接物种[(OC)_2Rh(mu-p-MeC_6H_4NNNC_6H_4Me-p)_2PdLL'] {LL'= eta〜3-C_3H_5 1或Cl(PPh_3)2},在Me_3NO存在下,与[NBu〜n_4] I,[NBu〜n_4] Br,[PPN] Cl或[NBu〜n_4] NCS反应,得到[(OC)XRh(mu-p-MeC_6H_4NNN-C_6H_4Me-p )_2PdCl(PPh_3)]〜-(X = I 3〜-,Br 4〜-,Cl 5〜-或NCS 6〜-)和[NBu〜n_4] [(OC)XRh(mu-p-MeC_6H_4-NNNC_6H_4Me -p)_2Pd(eta〜3-C_3H_5)],(X = I 7〜-或Br 8〜-)。烯丙基配合物7〜-和8〜-经历单电子氧化反应生成相应的不稳定中性配合物7和8,但是在适当的卤化物存在下,氧化取代产生稳定的顺磁性络合物[NBu〜n_4] [X_2Rh(mu-p-MeC_6H_4NNNC_6H_4Me-p)_2Pd(eta〜3-C_3H_5)],(X = 19〜 -或Br 10〜-)。X射线结构(9〜-),DFT和EPR光谱镜下研究与主要位于[RhPd]〜(4+)核的Rh(II)中心的9〜-和10〜-的不成对电子一致,该电子在低温下易受氧配位而产生Rh( III)结合超氧化物。

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