Polyamine, cyclic/acyclic

Cyclic/Acyclic Polyamine Type Artificial Chemosensors. 

Although the vast majority of this review has been concerned with homogeneous systems, supported catalyst and single-crystal studies of rhodium are important topics that have also been considered by some researchers. This topic extends and dovetails nicely with the discussion of the interactions of acyclic and cyclic polyamine ligands and Schiff... 

The resin-bound polyamine was used as a template for the solid-phase synthesis of a range of heterocyclic compounds, such as cyclic ureas 25 and cyclic thioureas 26. This work exemplifies our ongoing efforts on the solid-phase assembly of individual acyclic and heterocyclic compounds and combinatorial libraries using short peptides as starting materials. 

Since macrocyclic polyamines have a much greater charge density within the molecular skeletons in the multi-protonated state as compared to the linear polyamines, they should have an entropic advantage for the complexation of phosphates. On the basis of this advantage of macrocyclic polyamines over the corresponding acyclic polyamines, Kimura et aL reported that a macro-cyclic hexaamine 3 showed stronger affinity to AMP, ADP and ATP at pH 8.0... 

Acyclic, cyclic, di- and polyamines (dichloroethane ammonation and nentralising aminohydrochloride) [12],... 

Cobalt complexes with cyclic and acyclic polyamines as hgands in aqueous solutions as dioxygen carriers 12CCR316. 

The overall basicities of polyazacycloalkanes are lower than those of their acyclic counterparts, because of greater gathering of positive charge occurring for the cyclic molecules upon successive protonation (Figure 5). Nevertheless, the parallelism between the variation of the overall basicities of macrocyclic and open-chain polyamines and the number of amine groups is consistent with similar protonation pattems. ... 

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