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Table 1 Electronic, emission spectral data of complexes 14 in H2O at 25 °C

From: Synthesis and characterization of novel rhenium(I) complexes towards potential biological imaging applications

Complex UV visible absorption/nm Excitation/nm Emission/nm
Inter-ligand MLCT
w[Re(CO)3L1(H2O)]+ (1) 330 420 425 700
a[Re(CO)3L1(H2O)]+ (1)    470 710
wRe(CO)3L1Br (2) 328 400 400 480b, 658
w[Re(CO)3L2(H2O)]+ (3) 315 395 441 672
a[Re(CO)3L2(H2O)]+ (3)    424 645
wRe(CO)3L2Br (4) 300 396 398 640
aRe(CO)3L2Br (4)    396 645
  1. WIn water
  2. aIn acetonitrile
  3. bPeak due to excess ligand