| Abstrakt: |
The reaction of N-hydroxy-2,2′-iminodipropionic acid with [PPh4][ReOBr4], [ReOCl3(PPh3)2], [ReOCl2(OEt)(PPh3)2] or [PPh4][MoOCl4(H2O)] has produced four novel complexes: [ReOBr3(C6H8NO5)] -, [ReOBr3(C3H3NO2)] -, [ReOCl2(R,S-idpa)]- (H3idpa = 2,2′-iminodipropionic acid) and [MoO2Cl2(C3H4NO3 )]-. All have been successfully crystallised as their [PPh4]+ salts which have been characterised by single-crystal X-ray diffraction. The anions [ReOBr3(C6H8NO5)] - and [ReOBr3(C3H3NO2)] - involve tetragonally distorted octahedral ReVOBr3 (N,O) centres with the bromides cis to the oxo-group; [ReOCl2(R,S-idpa)]- involves a tetragonally distorted octahedral ReVOCl2 (O,N,O) centre with the 2Cl cis and O trans to the oxo-group; [MoO2Cl2(C3H4NO3 )]- involves a skew-trapezoidal MoVIO2Cl2 (N,O) centre with essentially mutual cis oxo-groups and trans chloro-groups. The dimensions of each of these co-ordination spheres are generally typical of related complexes; however, [ReOBr3(C3H3NO2)] - involves an unusually short Re–Ooxo bond of 1.45(4) Å. The organic moieties are considered to arise from rearrangement and/or fragmentation of N-hydroxy-2,2′-iminodipropionic acid, presumably under the influence of the metal centre. |
