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
的2-反应(芳基偶氮)
嘧啶(RC 6 ħ 4 NNC 4 ħ 3 Ñ 2,缩写为A
APM; R = H(P
APM),Ô -Me(ø -t
APM),米-Me(m -t
APM),p -Me(p -t
APM),p -Cl(p -Clp
APM))与(2-甲氧基
乙醇中的(NH 4)2 [OsCl 6 ])制得两种组成为OsCl 2(a
APM)2的异构体。它们通过1 H NMR光谱进行结构表征,并确定为顺式–反式-顺式(ctc)和顺式-顺式-顺式(ccc)异构体。关于Cl的配位对;通过X射线衍射研究确认了ctc -OsCl 2(p -t
APM)2的结构为N(
嘧啶)(N)和N(偶氮)(N')。该复合物在可见光到近红外区域表现出多个MLCT跃迁。氧化还原研究表明,与SCE相比,在1.2–1.3 V时有Os(III)/ Os(II)耦合,在〜2 V时有Os(IV)/ Os(III)耦合。EHMO计算