Elsevier, Inorganic Chemistry Communications, 2(14), p. 399-402
DOI: 10.1016/j.inoche.2010.12.011
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Paramagnetic Cl3Ru(L) complexes of tridentate ligands (2a: L=1a=4′-(p-bromophenyl)-2,2′:6′,2″-terpyridine; 2b: L=1b=6-(p-bromophenyl)-2,4-dipyrid-2-yl-1,3,5-triazine) were synthesized in a high-yield method with facile isolation of these useful synthons. The complexes were isolated in high purity and were characterized by several methods, including standard techniques such as 1H NMR and electrospray ionization mass spectrometry. The 1H NMR of the complexes displayed peaks from +10 to −37ppm, with the protons ortho to the nitrogen atoms coordinated to the paramagnetic centre being shifted the most (2a: H6,6″=−35.3ppm; 2b: H6,6″=−26.1ppm), while the protons on the non-bonding phenyl rings were relatively unchanged with respect to their uncomplexed ligands. The electronic absorption spectra of the complexes displayed both 1LMCT bands (Cl-to-Ru, 2a: λmax=405nm; 2b: λmax=420nm) and 1MLCT (Ru-to-L, 2a: λmax=486nm; 2b: λmax=567nm) bands. Due to the ease of purification and high yields, the use of complex 3, first introduced by Chatt, is the method of choice to form Cl3Ru(L) complexes of tridentate ligands.