title: Dicarbonyl-nitrosyl-complexes of rhenium (Re) and technetium (Tc), a potentially new class of compounds for the direct radiolabeling of biomolecules.
abstract: Re- and Tc-complexes of the oxidation state (+I) offer a useful synthetic pool for the labeling of biomolecules due to their co-ordination properties and stability, which are superior to compounds of the oxidation state (+V). Based on the results for Tc-tricarbonyl complexes it was the topic of this work to develop an access to similar but higher charged compounds, which could be performed by replacing a neutral [CO]-group by a [NO](+)-group. The resulting Re(I)- and Tc(I)-dicarbonyl-nitrosyl complexes, such as [N(CH2CH3)4][ReX3(CO)2(NO)], show a tendency for co-ordination at carboxylic and amine groups of biomolecules (X = Br, Cl). This was shown with picolinic acid (H-pic), a suitable model for amino acids, forming the neutral complex [ReX(pic)(CO)2(NO)]. In a similar fashion conjugation of [188Re(CO)2(NO)](2+)- or [99mTc(CO)2(NO)](2+)-compounds to proteins or antibodies is feasible. This approach opens a way to a potentially new class of radiopharmaceuticals.
authors.affiliation: Department of Nuclear Medicine, Universitätsklinik Ulm, Robert-Koch-Str. 8, D-89081 Ulm/Germany. dirk.rattat@medizin.uni0ulm.de
authors.forename: D
authors.initials: D
authors.lastname: Rattat
authors.forename: P A
authors.initials: PA
authors.lastname: Schubiger
authors.forename: H G
authors.initials: HG
authors.lastname: Berke
authors.forename: H
authors.initials: H
authors.lastname: Schmalle
authors.forename: R
authors.initials: R
authors.lastname: Alberto
mesh_terms: D007553:Isotope Labeling / Q000379:methods; D011854:Radiochemistry; D019275:Radiopharmaceuticals / Q000138:chemical synthesis* / Q000737:chemistry; D012211:Rhenium; D017556:Technetium Compounds / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D019275:Radiopharmaceuticals; D017556:Technetium Compounds; D012211:Rhenium