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Conducting polymers incorporating tungsten-capped calixarenes.

Calixarenes are highly versatile scaffolds for the design of 3-D cavities, 1 and have found wide utility in host -guest chemistry and molecular recognition. 2 The ability of calixarenes to selectively bind various cations at their lower rim has been widely utilized in the design of both small molecule 3 and polymeric sensory materials. 4 However, despite the numerous examples of calixarene inclusion complexes with organic molecules in the hydrophobic pocket, this binding mode has largely been unexplored with regard to sensors. 1,5,6As part of our continued interest in conjugated polymer-based sensors 7 we endeavored to make conducting polymeric materials containing conformationally rigid metallocalixarene repeat units. In pursuing this system we considered that the communication between the polymer and the calixarene moiety could be mediated via a transition metal center. Calixarenes1a-c were prepared by literature methods. 8,9