Polyhedron (2020)
Update date:2022-08-17
Topics:
van Niekerk
Gerber
Hosten
The reaction of the pyrazole-benzothiazole hybrids 2-(3,5-dimethylpyrazol-1-yl)benzothiazole (dmp) and 2-(2-benzothiazolyl)-4,5,6,7-tetrahydro-2H-indazol-3-ol (Hbth) with [Re(CO)5Cl] resulted in the formation of neutral complexes with the general formula [ReCl(CO)3(HL)] (HL = dmp (1), Hbth (2)). 1-(Benzo[d]thiazol-2-yl)-4-methyl-1H-pyrrol-2-ol (Hbtm) gave the trimeric species [Re(btm)(CO)3]3 (3) by reaction with [Re(CO)5Cl]. Reaction with [ReVOCl3(PPh3)2] led to the isolation of the oxo-bridged dimeric compound (μ-O)[ReOCl2(dmp)]2 (4) and [ReOCl(bth)(bth1)] (5) [bth1 = 2-(benzo[d]thiazol-2-yl)-1,2,4,5,6,7-hexahydro-3H-indazol-3-one] by reaction with dmp and Hbth, respectively. The reactivity of Hbtm with trans-[ReOCl3(PPh3)2] in ethanol gave [ReOCl(btm)(btm1)] (6) [btm1 = 2-(benzo[d]thiazol-2-yl)-5-methyl-1,2-dihydro-3H-pyrazol-3-one], whereas [ReOCl(btm1)(btz)] (7) [btz = 1-(benzo[d]thiazol-2-yl)-4-(1-iminoethyl)-3-methyl-1H-pyrazol-5ol] formed in acetonitrile using the same reactants. The rhenium(V) complexes [ReO(OMe)(btm)(btm1)] (8) and [ReO(OEt)0.96(I)0.04(btm)(btm1)] (9) were isolated upon reacting Hbtm with cis-[ReO2I(PPh3)2] in methanol and ethanol, respectively. The structures of complexes 1–9 were determined by X-ray diffraction methods and confirmed spectroscopically.
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