Bio‐orthogonal “Double‐Click” Chemistry Based on Multifunctional Coatings

Double “click”: Two different molecules can be sequentially immobilized on defined areas of the same surface by utilizing the different reactivity of activated and non-activated alkynyl groups (see picture). The reactions were carried out at room temperature in water, with the first immobilization step being catalyst-free and the second step requiring CuI as a catalyst. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.