Cyclam 1,4,8,11-tetra-azacyclo

Grant et al. studied a similar system using [Ni(cyclam)]2+ as the catalyst (cyclam = 1,4,8,11-tetra-azacyclo tetradecane), [Ru(bpy)3]2+ as the photosensitizer, and ascorbic acid as the sacrificial reductant [34], and observed a pH dependence on CO/H2 ratios, with the best ratio of 0.83 1 at pH 5. When Kimura etal. prepared pyridine derivatives of [Ni(cyclam)]2+ [35], the best complex, in C02-saturated ascorbate buffer at pH 5.1 and [Ru(bpy)3]2+ as the photosensitizer, produced 5.8-fold more CO than [Ni(cyclam)]2+. 

The complex [ (trans -cyclam)Mn (N) 2(fi-N3)], where cyclam= 1,4,8,11-tetra-azacyclo-tetradecane, has vMn = N at 1031 cm. An IR band in the range 640-668 cm was assigned as vMn-NO in Mn(N0)(CN)2(L)2(H20), where L = 2- or 3-pyrazoline-5-ones. IR spectra were reported for a range of Schiff base complexes of Mn(III). These showed bands with considerable vMnN characteristics near 369 cm, with vMnO near 329 cm and vMnCl near 303 cm. ... 

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