Selective lithium encapsulation in aqueous solution by the new cage 4,10-dimethyl-1,4,7,10-dimethyl-1,4,7,10,15-pentaazabicyclo[5.5.5]heptadecane (L). Synthesis, characterization, and structural aspects. Crystal structures of [LiL][ClO4] and [CuL]Br2•3H2O
In: Inorganic chemistry (Print), Jg. 29 (1990), Heft 18, S. 3282-3286
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academicJournal
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Zugriff:
The cage selectively encapsulates Li+, and the inclusion [LiL]+ complex formation equilibrium has been investigated by potentiometry (log K=4.8) and 7Li NMR techniques. The molecular structure of the complex [LiL] [ClO4] has been determined by single-crystal X-ray analysis. The compound crystallizes in a monoclinic unit cell (space group P21/n) with lattice constants a=15.046 (11) Å, b=8.893 (4) Å, c=15.305 (8) Å, and β=113.58 (4)°, with Z=4. Least-squares refinement converged at R=0.065 for 1385 observed reflections of I>3 σ(I). Li+ is wholly enclosed in the cage cavity and adopts a five-coordinate geometry, with a short Li-N mean distance of 2.04 Å. The molecular structure of the complex [CuL] [Br2]•3H2O has been determined by single-crystal X-ray analysis. The compound crystallises in an orthorhombic unit cell (space group Cmc21) with lattice constants a=11.629 (1) Å, b=13.031 (1) Å, and c=14.702 (1) Å, with Z=4. Least-squares refinement converged at R=0.068 for 542 observed reflections of I>3 σ (I).
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Selective lithium encapsulation in aqueous solution by the new cage 4,10-dimethyl-1,4,7,10-dimethyl-1,4,7,10,15-pentaazabicyclo[5.5.5]heptadecane (L). Synthesis, characterization, and structural aspects. Crystal structures of [LiL][ClO4] and [CuL]Br2•3H2O
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Autor/in / Beteiligte Person: | BENCINI, A ; BIANCHI, A ; BORSELLI, A ; CHIMICHI, S ; CIAMPOLINI, M ; DAPPORTO, P ; MICHELONI, M ; NARDI, N ; PAOLI, P ; VALTANCOLI, B |
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Zeitschrift: | Inorganic chemistry (Print), Jg. 29 (1990), Heft 18, S. 3282-3286 |
Veröffentlichung: | Washington, DC: American Chemical Society, 1990 |
Medientyp: | academicJournal |
Umfang: | print, 22 ref |
ISSN: | 0020-1669 (print) |
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