Abstract
AbstractPotentially tridentate, phosphine‐containing Schiff bases with P,N,O and P,N,P donor sets have been prepared from 2‐(diphenylphosphino)benzaldehyde, salicylaldehyde, 2‐aminophenol and 2‐((diphenylphosphino)phenyl)methylamine and reacted with (NEt4)2[Re(CO)3Br3] in methanol. Deprotonation and the formation of neutral [Re(CO)3(L)] complexes with tridentate coordination of the Schiff bases has been obtained for the salicylidene derivatives, while the potential P,N,P ligand L3 forms [Re(CO)3Br(L3)] with the Schiff base in a bidentate bonding mode. The formation of a cationic [Re(CO)3(L3)]+ complex with tripodal coordination of the organic ligand could be achieved by the addition of Ag(PF6) to the reaction mixture. The obtained rhenium(I) complexes were studied spectroscopically and by X‐ray diffraction.
Highlights
Rhenium possesses two β–emitting isotopes, which can be used for nuclear medical therapy: 186Re and 188Re.[9,10]
Reactions of (NEt4)2[Re(CO)3Br3] with the Schiff bases HL1 or HL2 in methanol give yellow to orange-red solids of the composition
The presence of three IRactive modes is typical for facial tricarbonyl complexes with a low-symmetric coordination sphere
Summary
Tridentate Schiff bases become interesting, since they can match the available coordination positions of the. {M(CO)3} + cores (M = Re, Tc) and, provide a maximum of stability for the corresponding complexes.[14,15,16,17,18,19,20,21,22,23,24,25,26,27] Such a stability, preferably accompanied by a kinetic inertness, is a fundamental requirement for use of corresponding tricarbonyl complexes in nuclear medical applications
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