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In the following, we report a first direct experimental evidence for the existence of two synthetic regimes due to g The first input was enabled by the divergent synthesis of g=6 DP thus producing an extended homologous series of DP with g=1...6, denoted as PGg (Methods).We investigated two homologous series differing in the polymerization degree of the backbone, N: long DP of N≈1,000 ( effects and the onset of SIS.In particular, the defect is associated with the occurrence of non-reacted primary amine groups.(c) The number of defects can be quantified via the ultraviolet (UV) absorbance or fluorescence of a label specifically binding to these defects.First, the existence of the two synthetic regimes is a qualitative signature of dendritic systems that remained essentially unverified and thus of fundamental interest.Second, the exploration of dendritic molecules with g≥g is of practical interest for producing densely packed molecular objects with controllable surface properties and an increased range of tunable spans.50) and thus at the boundary of the g=1...6 homologous series.
It is particularly suitable for the study of g effects diagnosed via defect quantification at high g.Note that while the enhanced tuning range is attained at the price of introducing unavoidable defects at g≥g range, this work presents a theoretical framework for quantifying defect statistics on the basis of labelling reactions.It thus introduces a simple technique for the detailed quantitative characterization of dendritic molecules.In contrast, SIS effects in the g range explored are envisioned only in long, locally cylindrical DP because of their lower g arising since short DP adopts a dendrimer-like, near spherical, shape traceable to backbone end effects. The roots are reacted with X-functional dendronization units (D units), having one reactive functionality and X−1 blocked, non-reactive, functional groups.The divergent synthesis of a dendron proceeds from a f-functional root attached to a point-like core, to a linear polymer chain or to a surface (Fig. In the next step, the blocked groups of the D units bound to the root are activated and their deblocked groups reacted with newly added D units.