the cases of Re(CO)3Cl(RLpm) and Re(CO)3Cl(RLim), respectively. The redox orbital is believed to be to the above noted LUMO. Electrogenerated Re(CO)3Cl(RL−) underwent spontaneous solvolytic chloride displacement in MeCN furnishing Re(CO)3(MeCN)(RL−) which has been isolated. The latter in turn reacted with imidazole and triphenyl phosphine furnishing Re(CO)3(C3H4N2)(RL−) and Re(CO)3(PPh3)(RL−), respectively
(一般缩写,RL)中使用的azopyrimidine和azoimidazole配体在目前的工作是2-(p -RC 6 H ^ 4 NN)C 4 H ^ 3 Ñ 2,RL时(R = H,C1)和2-(p - RC 6 H 4 NN)-1-(Me)C 3 H 2 N 2,RL im(R = Me,Cl)。Re(CO)5 Cl与稍微过量的RL在沸腾的苯中的反应提供了Re(CO)3 Cl(RL)类型的蓝紫色配合物,已对其进行了光谱表征。稀土(CO)3 Cl(HL pm)和Re(CO)3 Cl(ClL im)的Re – N h,Re – N a距离分别为2.173(6),2.136(6)Å和2.150(5),2.166(5)Å(N h和N a分别是杂环和偶氮N原子)。它们的N – N长度(1.271(8),1.281(7)Å)意味着相对较弱的Re-azo(π *)反向键合。在Re(CO)3 Cl(HL
2-(Arylazo)pyrimidines (aapm, 3) have been synthesized by condensing nitrosoaromatics with 2-aminopyrimidine. They yield cationic bis-chelated complexes with copper(I), Cu(aapm)2+ and are isolated as perchlorate salts. The complexes are 1:1 electrolytes in MeOH and exhibit intense MLCT transitions in the visible region. The NN stretch in copper(I) complexes shows a large shift to lower frequency (approx
通过将亚硝基芳族化合物与2-氨基嘧啶缩合,合成了2-(芳基偶氮)嘧啶(aapm,3)。它们产生具有铜(I),Cu(aapm)2 +的阳离子双螯合络合物,并以高氯酸盐的形式分离。该络合物是在MeOH中的1:1电解质,并在可见光区域表现出强烈的MLCT转变。由于d(Cu)→π *(aapm ),铜(I)配合物中的NN展宽从游离配体值(约1425 cm -1)向较低频率(约1315 cm -1)有很大的偏移。)背面粘接。配合物显示高度拆分的对称1 H NMR光谱。在MeOH中,Cu(aapm)2 2+ / Cu(aapm)2 +一对大约在E 1/2处出现。在298 K下相对于SCE为0.7V。该结构已通过X射线晶体学证实。
Osmium–azopyrimidine chemistry. Part VII: synthesis, structural characterisation and electrochemistry
Reaction of 2-(arylazo)pyrimidines (RC6H4NNC4H3N2, abbreviated aapm; R=H (papm), o-Me (o-tapm), m-Me (m-tapm), p-Me (p-tapm), p-Cl (p-Clpapm)) with (NH4)2[OsCl6] in 2-methoxyethanol gives two isomers of composition OsCl2(aapm)2. They are structurally characterised by 1H NMR spectra and established as the cis–trans–cis (ctc) and cis–cis–cis (ccc) isomer. With reference to the coordination pairs
of one of the compounds has suggested the coupling of ArNH2 at ortho-C–H of the pendant aryl part of aapm in the chelated complex. The stereochemistry and the bonding are described by 1H NMR data. The solution electronic spectra of Pt(aapm-N–Ar)Cl exhibit multiple transition at Vis–NIR region (500–1250 nm) which are absent in Pt(aapm)Cl2. Cyclic voltammograms show two quasireversible azo reductions of
2-(芳基偶氮)嘧啶(p -RC 6 H 4 –NN–C 4 H 3 N 2,aapm,R = H(papm,3a),Me(tapm,3b),Cl(Clpapm,3c))是N,N'-螯合配体。铂(II)配合物Pt(aapm)Cl 2(4)是在回流条件下,通过K 2 PtCl 4和aapm在MeCN-水中的反应合成的。Pt(aapm)Cl 2与ArNH 2在MeCN中的反应合成了C–N偶联产物Pt(aapm-N–Ar)Cl(5 –10)。一种化合物的单晶X射线结构测定表明,螯合配合物中aapm侧基芳基部分的邻-C–H处有ArNH 2偶联。立体化学和键合通过1 H NMR数据描述。Pt(aapm-N–Ar)Cl的溶液电子光谱在Vis–NIR区(500–1250 nm)处显示出多个跃迁,而Pt(aapm)Cl 2中不存在。循环伏安图显示Pt(aapm)Cl 2的两个拟可逆偶氮还原;Pt(aapm
Chemistry of Azopyrimidines. Part III. Synthesis, Spectral Characterization and Electrochemical Studies of Arylazopyrimidine Complexes of Palladium(II) and Catecholato Derivatives
作者:R. Roy、P. K. Santra、D. Das、C. Sinha、K. Sakata、H. Kuma