Details

Autor(en) / Beteiligte

• Lv, Hai-Ting
• Li, Hua-Min
• Zou, Guo-Dong
• Cui, Ying
• Huang, Yang
• Fan, Yang

Titel

Titanium-oxo clusters functionalized with catecholate-type ligands: modulating the optical properties through charge-transfer transitionsElectronic supplementary information (ESI) available: Information of ESI figures. CCDC 1841900-1841903. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c8dt01844h

Erscheinungsjahr

2018-06

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Four phenylphosphonate-stabilized titanium-oxo clusters with varying functional ligands, namely, [Ti 8 (μ 3 -O) 2 (μ 2 -O) 2 (μ 2 -OiPr) 4 (OiPr) 8 (O 3 PC 6 H 5 ) 4 (cat) 2 ] (cat = catecholate), [Ti 8 (μ 3 -O) 2 (μ 2 -O) 2 (μ 2 -OiPr) 4 (OiPr) 8 (O 3 PC 6 H 5 ) 4 (O 2 C 10 H 6 ) 2 ] (O 2 C 10 H 6 = naphthalene-2,3-diolate), [Ti 6 (μ 3 -O) 2 (μ 2 -O) 2 (μ 2 -OiPr) 4 (OiPr) 6 (O 3 PC 6 H 5 ) 2 (4-DMAB) 2 ] (4-DMAB = 4-dimethylaminobenzoate), and [Ti 6 (μ 3 -O) 2 (μ 2 -O) 2 (μ 2 -OiPr) 4 (OiPr) 6 (O 3 PC 6 H 5 ) 2 (4-CBA) 2 ] (4-CBA = 4-cyanobenzoate) were synthesized and structurally characterized. The introduction of catecholate ligands effectively extended the visible absorption region up to 670 nm and reduced the band gap to 2.1 eV. DFT calculations revealed that the ligand-based energy levels could effectively modify the band structure of titanium-oxo clusters. The ligand-to-core charge transfer (LCCT) transition from the functional ligands to the cluster core is responsible for the low-energy charge transfer states. Photoelectrochemical and photocatalytic experiments show that functional ligands have significant influence on the physicochemical properties of titanium-oxo clusters. Charge transfer transitions effectively modulated the optical properties of the catecholate-type ligand functionalized titanium-oxo clusters [Ti 8 (μ 3 -O) 2 (μ 2 -O) 2 (μ 2 -OiPr) 4 (OiPr) 8 (O 3 PC 6 H 5 ) 4 (cat) 2 ] and [Ti 8 (μ 3 -O) 2 (μ 2 -O) 2 (μ 2 -OiPr) 4 (OiPr) 8 (O 3 PC 6 H 5 ) 4 (O 2 C 10 H 6 ) 2 ].