286380-67-4Relevant academic research and scientific papers
Preparation, properties, and reactions of metal-containing heterocycles, 101. Inclusion of copper(I) into a novel bipyridine-containing tetraphosphadiplatinacyclophane
Lindner, Ekkehard,Veigel, Robert,Ortner, Kirstin,Nachtigal, Christiane,Steimann, Manfred
, p. 959 - 969 (2007/10/03)
The 5,5'-bis(hydroxyalkyl)-2,2'-bipyridines 4a-c (Scheme 1) were prepared either in one step (4b, 4c) or in four steps (4a) starting with 5,5'-dimethyl-2,2'-bipyridine in each case. Reaction of 4a-c with mesyl chloride afforded the bis(mesylates) [-C5H3N-(CH2)(n)-CH2-OSO2Me]2 5a-c [n = 1 (a), 2 (b), 3 (c)], which could easily be transformed into the diphosphanes 6a-c by reaction with LiPPh2. Treatment of 6c, 6b with Cl2Pt(NCPh)2 and (RC6H4)2Pt(COD) according to the high-dilution method resulted in the formation of the tetraphosphadiplatinacyclophanes [-C5H3N- (CH2)4-PPh2PtCl2PPh2-(CH2)4-C5H3N-]2 (7c) and [-C5H3N-(CH2)3- PPh2Pt(C6H4R)2-PPh2-(CH2)3-C5H3N-]2 (8b, 9b) (8b: R = H, 9b: R = tBu), respectively (Scheme 2). The molecular structures of 8b and 9b were elucidated by X-ray structural analyses. The noncoordinated bipyridine moieties in 8b were employed to encapsulate copper(I)to give the host/guest complex 10b (Scheme 3), which was investigated by FAB-MS, NMR spectroscopy, and cyclovoltammetry. 10b exhibited a quasi-reversible oxidation at E(1/2) = -0.31 V and an electrodeposition-redissolution redox system at E(1/2) = - 0.79 V, owing to the formation of copper at the surface of the working electrode.
