Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands

Imran M, Mix A, Neumann B, Stammler H-G, Monkowius U, Bleckenwegner P, Mitzel NW (2014)
Dalton Transactions 43(28): 10956-10968.

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Abstract
Some novel complexes of bismuth(III) with the Janus scorpionate ligand [HB(mtda(Me))(3)](-)(mtda(Me) = 2-mercapto-5-methyl-1,3,4-thiadiazolyl) were synthesised. Na[HB(mtda(Me))(3)] (1) was reacted with BiX3 (X = Cl, I, NO3) in the molar ratio 2 : 1 to afford the bismuth complexes {HB(mtda(Me))(3)}(2)BiCl (3), Na[{HB-mtda(Me))(3)}(2)Bil(2)] (4) and [{HB(mtda(Me))(3)}(2)Bi(NO3)](n) (5). Two mixed complexes {HB(mtda(Me))(3)} Bi(phen)Cl-2 (6) and {HB(mtda(Me))(3)}Bi(bipy)Cl-2 (7) were obtained using Janus scorpionate as the primary ligand in the presence of 1,10-phenanthroline and 2,2'-bipyridyl, respectively, as co-ligands in the 1 : 1 ratio. The obtained complexes were characterised by H-1, C-13 and diffusion NMR (DOSY), elemental analyses and mass spectrometry. Structures of the compounds NBu4[HB(mtda(Me))(3)] (2), 3, 4, 5, 6 and 7 were determined by single crystal X-ray diffraction. The molecular dynamic process in complex 3 was also studied by variable temperature NMR measurements. All bismuth complexes, except for the polymeric 5, are monomeric. Complexes 6 and 7 exhibit (B) H. Bi distances of 2.76(3) and 2.71(2) length, respectively. Compounds 2, 6 and 7 were screened for their luminescence activity. At 77 K in ethanol solution, complexes 6 and 7 exhibit phosphorescence from ligand-to-ligand charge transfer (LLCT) and the ligand-centred (LC) excited state, respectively.
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Imran M, Mix A, Neumann B, et al. Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands. Dalton Transactions. 2014;43(28):10956-10968.
Imran, M., Mix, A., Neumann, B., Stammler, H. - G., Monkowius, U., Bleckenwegner, P., & Mitzel, N. W. (2014). Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands. Dalton Transactions, 43(28), 10956-10968.
Imran, M., Mix, A., Neumann, B., Stammler, H. - G., Monkowius, U., Bleckenwegner, P., and Mitzel, N. W. (2014). Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands. Dalton Transactions 43, 10956-10968.
Imran, M., et al., 2014. Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands. Dalton Transactions, 43(28), p 10956-10968.
M. Imran, et al., “Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands”, Dalton Transactions, vol. 43, 2014, pp. 10956-10968.
Imran, M., Mix, A., Neumann, B., Stammler, H.-G., Monkowius, U., Bleckenwegner, P., Mitzel, N.W.: Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands. Dalton Transactions. 43, 10956-10968 (2014).
Imran, Muhammad, Mix, Andreas, Neumann, Beate, Stammler, Hans-Georg, Monkowius, Uwe, Bleckenwegner, Petra, and Mitzel, Norbert W. “Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands”. Dalton Transactions 43.28 (2014): 10956-10968.
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