TY - JOUR
T1 - Quadruply bonded dimetal units supported by 2,4,6-triisopropylbenzoates MM(TiPB) 4 (MM = Mo 2, MoW, and W 2)
T2 - Preparation and photophysical properties
AU - Alberding, Brian G.
AU - Chisholm, Malcolm H.
AU - Chou, Yi Hsuan
AU - Gallucci, Judith C.
AU - Ghosh, Yagnaseni
AU - Gustafson, Terry L.
AU - Patmore, Nathan J.
AU - Reed, Carly R.
AU - Turro, Claudia
PY - 2009/5/18
Y1 - 2009/5/18
N2 - The preparation and characterization (elemental analysis, 1H NMR, and cyclic voltammetry) of the new compounds MM(TiPB) 4, where MM = MoW and W 2 and TIPB = 2,4,6-trilsopropylbenzoate, are reported. Together with Mo 2(TiPB) 4, previously reported by Cotton et al. {Inorg. Chem. 2002, 41, 1639), the new compounds have been studied by electronic absorption, steady-state emission, and transient absorption spectroscopy (femtosecond and nanosecond). The compounds show strong absorptions In the visible region of the spectrum that are assigned to MMo to arylcarboxylate π* transitions, 1MLCT. Each compound also shows luminescence from two excited states, assigned as the 1MLCT and 3MMδδ* states. The energy of the emission from the 1MLCT state follows the energy ordering MM = Mo 2 > MoW > W 2, but the emission from the 3MMδδ* state follows the Inverse order: MM = W 2 > MoW > Mo 2. Evidence Is presented to support the view that the lower energy emission in each case arises from the 3MMδδ* state. Lifetimes of the 1MLCT states in these systems are ∼0.4-6 ps, whereas phosphorescence is dependent on the MM center: Mo 2 ∼ 40 fis, MoW ∼ 30 μs, and W 2 ∼ 1 μs.
AB - The preparation and characterization (elemental analysis, 1H NMR, and cyclic voltammetry) of the new compounds MM(TiPB) 4, where MM = MoW and W 2 and TIPB = 2,4,6-trilsopropylbenzoate, are reported. Together with Mo 2(TiPB) 4, previously reported by Cotton et al. {Inorg. Chem. 2002, 41, 1639), the new compounds have been studied by electronic absorption, steady-state emission, and transient absorption spectroscopy (femtosecond and nanosecond). The compounds show strong absorptions In the visible region of the spectrum that are assigned to MMo to arylcarboxylate π* transitions, 1MLCT. Each compound also shows luminescence from two excited states, assigned as the 1MLCT and 3MMδδ* states. The energy of the emission from the 1MLCT state follows the energy ordering MM = Mo 2 > MoW > W 2, but the emission from the 3MMδδ* state follows the Inverse order: MM = W 2 > MoW > Mo 2. Evidence Is presented to support the view that the lower energy emission in each case arises from the 3MMδδ* state. Lifetimes of the 1MLCT states in these systems are ∼0.4-6 ps, whereas phosphorescence is dependent on the MM center: Mo 2 ∼ 40 fis, MoW ∼ 30 μs, and W 2 ∼ 1 μs.
UR - http://www.scopus.com/inward/record.url?scp=66149095359&partnerID=8YFLogxK
U2 - 10.1021/ic900092c
DO - 10.1021/ic900092c
M3 - Article
AN - SCOPUS:66149095359
VL - 48
SP - 4394
EP - 4399
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 10
ER -