Water splitting using polymer photocatalysts is a key technology to a truly sustainable hydrogen-based energy economy. Synthetic chemists have intuitively tried to enhance photocatalytic activity by tuning the length of π-conjugated domains of their semiconducting polymers, but the increasing flexibility and hydrophobicity of ever-larger organic building blocks leads to adverse effects such as structural collapse and inaccessible catalytic sites. To reach the ideal optical band gap of about 2.3 eV, A library of eight sulfur and nitrogen containing porous polymers (SNPs) with similar geometries but with optical band gaps ranging from 2.07 to 2.60 eV was synthesized using Stille coupling. These polymers combine π-conjugated electron-withdrawing triazine (C3 N3 ) and electron donating, sulfur-containing moieties as covalently bonded donor-acceptor frameworks with permanent porosity. The remarkable optical properties of SNPs enable fluorescence on-off sensing of volatile organic compounds and illustrate intrinsic charge-transfer effects.

Department of Chemistry Humboldt Universität zu Berlin Brook Taylor Str 2 12489 Berlin Germany

Department of Organic Chemistry Charles University Prague Hlavova 8 128 00 Prague Czech Republic

Department of Physical and Macromolecular Chemistry Charles University Prague Hlavova 8 128 00 Prague Czech Republic

Institute of Chemistry Technische Universität Berlin Hardenbergstraße 40 10623 Berlin Germany

Institute of Organic Chemistry and Biochemistry of the CAS Flemingovo nám 2 166 10 Prague Czech Republic

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