| Abstract
| - (α-Imino acidato)ruthenium(II) complexes,[RuII{N(R1)C(R2)CO2}L2]+(R1 = R2 = Me or R1 =R2 = −(CH2)3−;L = 2,2‘-bipyridine (=bpy) or 1,10-phenanthroline (=phen)),were obtained by anodic oxidation at a constantpotential of the corresponding (α-aminoacidato)ruthenium(II) complexes, N-methylalaninatoor prolinato complexes,in good to excellent yields. (α-Iminoacidato)ruthenium(II) complexes are stable in neutral oracidic aqueoussolution. The half-wave potentials of α-imino acidato complexesare 0.73−0.78 V (vs SCE), which are morepositive than those of the corresponding α-amino acidato complexes,0.55−0.59 V. The crystal structure of[Ru(pro-H2)(bpy)2]ClO4·3H2O(pro-H2 = 1,2-didehydroprolinato) has been determined bysingle-crystal X-rayanalysis. Crystallographic data: space groupC2/c, a = 21.73(1) Å,b = 19.33(1) Å, c = 14.58(1) Å,β =114.91(5)°, Z = 8, R = 0.0352.The length of the CN double bond of the α-imino acidatemoiety is 1.294(5)Å, and Ru−N(imino nitrogen) = 2.042(3) Å. The chelatering of the α-imino acidato ligand is planar.
- (α-Iminoacidato)ruthenium(II) complexes,[RuII{N(R1)C(R2)CO2}(bpyor phen)2]+ (R1 =R2 = Me; R1, R2 =−(CH2)3−) were obtained by anodic oxidationat a constant potential of the N-methylalaninato orprolinato ruthenium(II) complexes. The half-wave potentialsof the α-imino acidato complexes are 0.73−0.78 V (vs SCE), whichare more positive than the anodic potentials of the correspondingα-amino acidato complexes, 0.55−0.59 V. The crystal structureof[Ru(pro-H2)(bpy)2]ClO4·3H2Owas determined by X-rayanalysis.
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