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Structural and Redox Variations in Technetium Complexes Supported by m-Terphenyl Isocyanides
Organometallics ( IF 2.5 ) Pub Date : 2020-06-03 , DOI: 10.1021/acs.organomet.0c00238
Guilhem Claude 1 , Federico Salsi 1 , Adelheid Hagenbach 1 , Milan Gembicky 2 , Michael Neville 2 , Chinglin Chan 2 , Joshua S. Figueroa 2 , Ulrich Abram 1
Affiliation  

A series of technetium complexes with the sterically encumbered m-terphenyl isocyanides CNArDipp2 (Dipp = 2,6-diisopropylphenyl) and CNArMes2 (Mes = 2,4,6-trimethylphenyl) has been prepared. The products span three different oxidation states (+1, +3, and +5) of the radioactive transition metal and comprise carbonyl, nitrosyl, chloride, and nitrido complexes. All members of this series (trans,mer-[TcI(CO)3Cl(CNArDipp2)], trans-[TcI(NO)Cl2(PPh3)(CNArDipp2)2], [TcIIICl3(PMe2Ph)2(L)] (L = CNArDipp2, CNArMes2), trans-[TcVNCl2(CNArDipp2)2], cis-[TcVNCl2(CNArMes2)2(L)] (L = H2O, MeOH), cis-[TcVNBr2(CNArMes2)2], and trans-[TcV(NPh)X2(CNArDipp2)2] (X = Cl, Br)) are stable under ambient conditions. The νCN IR frequencies measured for the complexes frequently appear at wavenumbers higher than those for the uncoordinated isocyanides, which suggests a low degree of back-donation into the CN π* orbitals of these ligands.

中文翻译:

结构和氧化还原作用的变化在锝配合物的支持的-三联苯异腈

与空间位阻的一系列锝络合物的-三联苯异氰化物CNAR Dipp2(迪普= 2,6-二异丙基)和CNAR Mes2(MES = 2,4,6-三甲基苯基)已被制备。产物跨越放射性过渡金属的三种不同氧化态(+ 1,+ 3和+5),并包含羰基,亚硝酰基,氯和亚硝基配合物。该系列的所有成员(反式, mer- [Tc I(CO)3 Cl(CNAr Dipp2)],反式-[Tc I(NO)Cl 2(PPh 3)(CNAr Dipp22 ],[Tc III Cl3(PME 2 PH)2(L)](L = CNAR Dipp2,CNAR Mes2),反式- [TC V的NCI 2(CNAR Dipp22 ],顺式- [TC V的NCI 2(CNAR Mes22(L) ](L = H 2 O,MeOH),顺式-[Tc V NBr 2(CNAr Mes22 ]和反式-[Tc V(NPh)X 2(CNAr Dipp22](X = Cl,Br))在环境条件下稳定。在ν CN的络合物测量IR频率频繁地出现在波数比用于不协调异氰化物,这表明低程度的回捐献到CNπ*这些配体的轨道高。
更新日期:2020-06-23
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