2-Pyridyl platinum complexes, reaction with

Platinum ( t) (1 = 1/2). The product, chelation of the coordination of diazenecarboxamides functionalised with the l-(2-picolyl)- H-1,2,3-triazole moiety (la-k) to platinum(II), where K2 PtCl4] and cis-[PtCl2(DMSO)2] were used as the platinum sources, with the metal centre through the 1,2,3-triazole N2 and the pyridyl nitrogen atoms under mild reaction conditions, were structurally characterised by Pt, H and NMR spectroscopy. The formation of the platinum complexes 2a-k was monitored using NMR spectroscopy. The complexation with... 

The Dalcanale group was also involved in this kind of hemicarcerand formation. For example, cavitand 21 was shown to coordinate with palladium or platinum and form the corresponding hemicarceplex containing either a solvent molecule or a single triflate counter-ion [70]. Additionally, taking advantage of their cavitand lithiation expertise, similar hosts were also synthesized by the Sherbum group. For example, they synthesized an A,C-te-pyridyl derivative and showed that reaction with platinum complexes led to cyclic dimers and trimers [71]. 

Spontaneously adsorbed monolayers of the dimeric complex (Figure 5.11) [(pOp) Os(bpy)2 (4-tet) Os(bpy)2 Cl]3+, where pOp is 4,4 -bipyridyl, bpy is 2,2/-bipyridyl and 4-tet is 3,6-bis(4-pyridyl)-l,2,4,5-tetrazine, have been assembled on platinum microelectrodes in an attempt to address these issues [33]. Significantly, as illustrated in Figure 5.11, the voltammetric response associated with the Osn/m reaction is unusually ideal for both metal centers. Studies using mononuclear model compounds reveal that the redox responses centered at approximately 0.620 and 0.300 V correspond to the inner [(pOp) Os(bpy)2 (4-tet)]2+ and outer [(4-tet) Os(bpy)2 Cl]+ moieties, respectively. The observation of two well-defined voltammetric waves indicates that electron transfer can occur across the [(pOp) Os(bpy)2 (4-tet)]2+ bridge to the outer [Os(bpy)2 Cl]+ moiety, i.e. charge trapping does not occur. 

Fujita reported a wide range of systems formed by the self-assembly of several nitrogen-donor ligands and palladium and platinum centers.In the assembly of some of these systems, the ternplating properties of anions play an important role. When the square planar complex [Pd(en)2(N03)2] is reacted with l,3,5-rm(4-pyridyl-methyl)benzene in the presence of anionic species having a hydrophobic moiety (such as 4-methoxyphenylacetate), the nearly quantitative formation of the cage structure 9 is observed (see Fig. 3). In the absence of the anionic/ hydrophobic species, this reaction gives rise to a considerable amount of polymeric material. Similarly, the... 

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