Reactions of sodium pyridine-2-selenolate with several palladium(II) and platinum(II) complexes were carried out and a variety of products isolated and characterized. Treatment of [M2Cl2(µ-Cl)2(PR3)2] with NaSeC5H4N readily afforded complexes of the type [MCl(NC5H4Se)(PR3)] 1 (M = Pd or Pt; PR3 = PEt3, PPrn3, PBun3, PMe2Ph, PMePh2 or PPh3). Some of the complexes containing trialkylphosphine existed as binuclear species, [M2Cl2(µ-NC5H4Se)2(PR3)2] 2 in ≈5% concentration in solution. Reaction of [MCl(NC5H4Se)(PR3)] with [M2Cl2(µ-Cl)2(PR3)2] gave an unusual series of binuclear complexes, [(R3P)Cl2M(NC5H4Se)MCl(PR3)] 3, in which NC5H4Se acts simultaneously as a Se bridging and Se,N chelating ligand. Reactions of [PtCl2(cod)] or Na2[PdCl4] with NaSeC5H4N afforded [M(NC5H4Se)2}n]. Similar reactions with [MCl2(L–L)] and [MCl2(PPh3)2] (L–L = dppm or dppe) gave [M(NC5H4Se)2(L–L)] and [M(NC5H4Se)2(PPh3)2], respectively. The latter complex exists in a dynamic equilibrium with [M(NC5H4Se)(NC5H4Se-N,Se)(PPh3)2] and PPh3. All the complexes were characterized by elemental analyses and NMR (1H, 31P, 77Se, 195Pt) spectral data. The crystal structure of [(Prn3P)Cl2Pd(NC5H4Se)PdCl(PPrn3)] revealed that NC5H4Se acts as a triply bridging ligand. One of the palladium atoms is co-ordinated to two trans chlorine atoms, one PPrn3, and a Se atom, while the second is bound to a chelating NC5H4Se ligand, a chlorine atom and a PPrn3 ligand.
钠吡啶-2-
硒酯与几种
钯(II)和
铂(II)配合物的反应进行了研究,并分离和表征了多种产物。用NaSeC5H4N处理[M2Cl2(μ-Cl)2(PR3)2],很容易得到类型为[MCl(NC5H4Se)(PR3)]的配合物1(M=Pd或Pt;PR3=PEt3, PPrn3, PBun3, PMe2Ph, PMePh2或PPh3)。一些含有三烷基膦的配合物以双核种类[M2Cl2(μ-NC5H4Se)2(PR3)2] 2的形式在溶液中约以5%的浓度存在。[MCl(NC5H4Se)(PR3)]与[M2Cl2(μ-Cl)2(PR3)2]的反应得到了一个不寻常的双核配合物系列[(R3P)Cl2M(NC5H4Se)MCl(PR3)] 3,其中NC5H4Se同时作为Se桥接和Se,N螯合
配体作 用。[PtCl2(cod)]或Na2[PdCl4]与NaSeC5H4N的反应得到[M(NC5H4Se)2}n]。与[MCl2(L–L)]和[MCl2(PPh3)2](L–L=dpPM或dppe)的类似反应分别得到了[M(NC5H4Se)2(L–L)]和[M(NC5H4Se)2(PPh3)2]。后者在动态平衡中存在与[M(NC5H4Se)(NC5H4Se-N,Se)(PPh3)2]和PPh3。所有配合物都通过元素分析和核磁共振(1H, 31P, 77Se, 195Pt)光谱数据进行了表征。[(Prn3P)
Cl2Pd(NC5H4Se)PdCl(PPrn3)]的晶体结构显示,NC5H4Se作为一个三重桥接
配体。一种
钯原子与两个反式
氯原子,一个PPrn3和一个Se原子配位,而另一种则与螯合的NC5H4Se
配体,一个
氯原子和一个PPrn3
配体结合。