Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes

Imran M, Neumann B, Stammler H-G, Monkowius U, Ertl M, Mitzel NW (2014)
Dalton Transactions 43(3): 1267-1278.

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Abstract
Two novel sodium complexes [NaBb] (1) (Bb = dihydrobis(2-mercapto-benzimidazolyl)borate) and [NaBt(Me)] (2) (Bt(Me) = dihydrobis(2-mercapto-4-methylthiazolyl)borate) have been prepared and characterized by using two heterocycles, 2-mercapto-benzimidazole and 2-mercapto-4-methylthiazole, as well as NaBH4 as precursors. The dipodal boron centred soft ligands Bb and BtMe were prepared in situ. The reactivity of [NaBb] (1) and [NaBt(Me)] (2) towards Bi(III) ions has been studied. The resulting complex [BiBb(2)Cl] (3) contains an MS4 core with kappa(3)-S,S,H coordination mode, while the complex [BiBt(3)(Me)] (4) with an MS6 core adopts a coordination mode. kappa(2)-S,S. A reaction of BiCl3 with the heterocyclic precursors 2-mercapto-benzimidazole (L-1) and 2-mercapto-4-methylthiazole (L-2) was also attempted; this afforded the monomeric [(BiL4Cl2)-Cl-1][(BiL2Cl4)-Cl-1] (5) and dimeric [BiL22(mu-Cl)Cl](2) (6) bismuth complexes. The bismuth complexes possess distorted octahedral geometries except 3 for which a face-capped octahedron is found. The presence of (B)H center dot center dot center dot Bi interactions has been identified by X-ray diffraction in 3 with a H center dot center dot center dot Bi distance of 2.58(1) angstrom which is uniquely short and unprecedented. Two of the synthesized complexes (4 and 5) have been investigated by luminescence spectroscopy. They feature emission bands in the solid state at room temperature at 674 (4) and 586 nm (5), which are hypsochromically shifted in (frozen) ethanolic solutions at 77 K to 618 and 537 nm, respectively.
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Imran M, Neumann B, Stammler H-G, Monkowius U, Ertl M, Mitzel NW. Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes. Dalton Transactions. 2014;43(3):1267-1278.
Imran, M., Neumann, B., Stammler, H. - G., Monkowius, U., Ertl, M., & Mitzel, N. W. (2014). Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes. Dalton Transactions, 43(3), 1267-1278.
Imran, M., Neumann, B., Stammler, H. - G., Monkowius, U., Ertl, M., and Mitzel, N. W. (2014). Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes. Dalton Transactions 43, 1267-1278.
Imran, M., et al., 2014. Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes. Dalton Transactions, 43(3), p 1267-1278.
M. Imran, et al., “Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes”, Dalton Transactions, vol. 43, 2014, pp. 1267-1278.
Imran, M., Neumann, B., Stammler, H.-G., Monkowius, U., Ertl, M., Mitzel, N.W.: Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes. Dalton Transactions. 43, 1267-1278 (2014).
Imran, Muhammad, Neumann, Beate, Stammler, Hans-Georg, Monkowius, Uwe, Ertl, Martin, and Mitzel, Norbert W. “Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes”. Dalton Transactions 43.3 (2014): 1267-1278.
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