TY - JOUR
T1 - Effect of ligand congeniality on energy transfer reaction between photo-excited tris(bipyridine)ruthenium(II) and chromate(III) complexes in aqueous solutions
AU - Otsuka, Takuhiro
AU - Iwamura, Munetaka
AU - Kaizu, Youkoh
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Culture and Sports in Japan (No.16205009).
PY - 2006/3/20
Y1 - 2006/3/20
N2 - Energy-transfer rate-constants from photo-excited [Ru(N-N) 3]2+ (N-N = 2,2′-bipyridine (bpy), 4,4′-dimethyl-2,2′-bipyridine (4dmb), 5,5′-dimethyl-2, 2′-bipyridine (5dmb)) to [Cr(O-O)3]3- (O-O 2- = ox2- ((COO-)2), mal 2- (CH2(COO-)2)) and [Cr(CN) 6]3- in encounter complexes were evaluated in aqueous solutions containing alkali metal ion. The rate constant depends on the molecular size of the ruthenium(II) complex: 1.8 × 108 s -1 for [Ru(bpy)3]2+ (molecular radius, r = 5.8 Å), 1.4 × 108 s-1 for [Ru(5dmb) 3]2+ (r = 6.1 Å) and 0.96 × 108 s-1 for [Ru(4dmb)3]2+ (r = 6.7 Å) in the system of [Ru(N-N)3]2+-[Cr(ox)3]3- in aqueous solution. However, the rate constant is much more sensitive to the chromate(III) complex than to ruthenium(II) complex; 1.8 × 108 s-1 and 0.43 × 108 s-1 for [Cr(ox) 3]3- (r = 4.0 Å) and [Cr(mal)3] 3- (r = 4.2 Å) in the [Ru(bpy)3]2+-[Cr(O- O)3]3- systems, respectively. We conclude that the congeniality between the donor's and acceptor's ligands in encounter complex plays an important role in energy transfer in aqueous solution.
AB - Energy-transfer rate-constants from photo-excited [Ru(N-N) 3]2+ (N-N = 2,2′-bipyridine (bpy), 4,4′-dimethyl-2,2′-bipyridine (4dmb), 5,5′-dimethyl-2, 2′-bipyridine (5dmb)) to [Cr(O-O)3]3- (O-O 2- = ox2- ((COO-)2), mal 2- (CH2(COO-)2)) and [Cr(CN) 6]3- in encounter complexes were evaluated in aqueous solutions containing alkali metal ion. The rate constant depends on the molecular size of the ruthenium(II) complex: 1.8 × 108 s -1 for [Ru(bpy)3]2+ (molecular radius, r = 5.8 Å), 1.4 × 108 s-1 for [Ru(5dmb) 3]2+ (r = 6.1 Å) and 0.96 × 108 s-1 for [Ru(4dmb)3]2+ (r = 6.7 Å) in the system of [Ru(N-N)3]2+-[Cr(ox)3]3- in aqueous solution. However, the rate constant is much more sensitive to the chromate(III) complex than to ruthenium(II) complex; 1.8 × 108 s-1 and 0.43 × 108 s-1 for [Cr(ox) 3]3- (r = 4.0 Å) and [Cr(mal)3] 3- (r = 4.2 Å) in the [Ru(bpy)3]2+-[Cr(O- O)3]3- systems, respectively. We conclude that the congeniality between the donor's and acceptor's ligands in encounter complex plays an important role in energy transfer in aqueous solution.
KW - Aqueous solution
KW - Encounter complex
KW - Energy transfer
KW - Ligand congeniality
KW - Ruthenium and chromium
UR - http://www.scopus.com/inward/record.url?scp=33644781562&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2005.12.049
DO - 10.1016/j.ica.2005.12.049
M3 - 学術論文
AN - SCOPUS:33644781562
SN - 0020-1693
VL - 359
SP - 1351
EP - 1356
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 5
ER -