It has a certain total number of valence electron pairs around it, which are subdivided into bonding and non-bonding pairs. This valence electron distribution determines the electron domain geometry and molecular geometry at the central atom. The ...
The scheme illustration of preparation process of TSG-PEI@ABG hydrogel is shown inFigure 1. The tetra-PEG-SG polymer could be feasibly prepared via the two efficient reactions in mild conditions. The1H NMR spectrum shows the explicit attribute of the characteristic peaks of tetra-PEG-SG with a...