Syntheses, structures and photoelectrochemical properties of three water-stable, visible light absorbing mental-organic frameworks based on tetrakis(4-carboxyphenyl)silane and 1,4-bis(pyridyl)benzene mixed ligands

摘要: Abstract Photovoltaics (PV), which directly convert solar energy into electricity generally using semiconductors, offer a practical and sustainable solution to the current shortage environmental pollution crisis. Photovoltaic applications of metal-organic frameworks (MOFs) belong relatively new area research. Given that UV light accounts for only 4% while visible contributes 43% energy, it is rather imperative develop semiconductors with narrow band gaps so they could absorb light. In this work, three water-stable, semiconducting MOFs [Cu(H2TCS)(H2O)] (1), [Co(H2TCS)(BPB)] (2) [Ni(H2TCS)(BPB)] (3) were synthesized tetrakis(4-carboxyphenyl)silane (H4TCS) 1,4-bis (pyridyl)benzene (BPB) in water, structurally characterized by single-crystal X-ray diffractions. MOF 1 has 2D structure. 2 3 are isostructrual have 3D formed interwoven layers. All stable acidic water solutions can be 7 days. 1–3 0.50, 1.77 1.49 eV, respectively. Rapid photocurrent responses under illuminations observed. This work demonstrates electron rich Cu2+, Co2+, or Ni2+ as metal nodes effectively decrease make them absorbing To increase conjugation linker considered method gap MOFs. The H4TCS not significant ligand basically absorbs However, Cu2+ ions nodes, prepared [Cu(H2TCS)(H2O)]·H2O (1) broadly region. Thus, suggests many narrow-band semiconductor even ligands