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Reaction of [ReOCl 3 (PPh 3 ) 2 ] or [ReO 2 I(PPh 3 ) 2 ] with 2,2'-diphenylglycine (dpgH 2 ) in refluxing ethanol afforded the air-stable complex [ReO(dpgH)(dpg)(PPh 3 )] ( 1 ). Treatment of [ReO(OEt)I 2 (PPh 3 ) 2 ] with 1,2,3-triaza-7-phosphaadamantane (PTA) afforded the complex [ReO(OEt)I 2 (PTA) 2 ] ( 2 ). Reaction of [ReOI 2 (PTA) 3 ] with dpgH 2 led to the isolation of the complex [Re(NCPh 2 )I 2 (PTA) 3 ]·0.5EtOH ( 3 ·0.5EtOH). A similar reaction but using [ReOX 2 (PTA) 3 ] (X = Cl, Br) resulted in the analogous halide complexes [Re(NCPh 2 )Cl 2 (PTA) 3 ]·2EtOH ( 4 ·2EtOH) and [Re(NCPh 2 )(PTA) 3 Br 2 ]·1.6EtOH ( 5 ·1.6EtOH). Using benzilic acid (2,2'-diphenylglycolic acid, benzH) with 2 afforded the complex [ReO(benz) 2 (PTA)][PTAH]·EtOH ( 6 ·EtOH). The potential for the formation of complexes using radioisotopes with relatively short half-lives suitable for nuclear medicine applications by developing conditions for [Re(NCPh 2 )(dpg)I(PTA) 3 ] ( 7 )[ReO 4 ] - in a 4 h time scale was investigated. A procedure for the technetium analog of complex [Re(NCPh 2 )I 2 (PTA) 3 ] ( 3 ) from 99m Tc[TcO 4 ] - was then investigated. The molecular structures of 1 - 7 are reported; complexes 3 - 7 have been studied using in vitro cell assays (HeLa, HCT116, HT-29, and HEK 293) and were found to have IC 50 values in the range of 29-1858 μM.

inorganic chemistry

Water-Soluble Rhenium Phosphine Complexes Incorporating the Ph2C(X) Motif (X = O–, NH–): Structural and Cytotoxicity Studies