ISSN:
1600-5759
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The title compound, bis[(N,N,N',N'- tetramethylethylenediamine)lithium μ-{1,1′-commo-1,1′dichlorobis[2,3-bis(trimethylsilyl)-2,3-dicarba-1-holma-closo-heptaborato]}-1κ3H4,4′5:2κ2H4′,5′, 2κCl-bis[(N,N,N',N'- tetramethylethylenediamine)lithium] benzene hemisolvate, [Li(TMEDA)2][{1-Cl-1-(μ-Cl)-2,2′,3,3′-(SiMe3)4– 5,6-[(μ-H)2Li(TMEDA)]-4,4′,5′-[(μ-H)3Li(TMEDA)]}-1,1′-commo-Ho(2,3-C2B4H4)2].0.5C6H6 (TMEDA = tetramethylethylenediamine), crystallized in a monoclinic space group P21/n. The structure of this cluster consists of an HoIII `carbons- adjacent' carborane bent-sandwich complex in which two Cl− ions are present, in different bonding environments, in the primary coordination sphere of the Ho atom giving a very distorted tetrahedral arrangement about the metal with the Ho—Cnt(1,2) = 2.378, 2.350 Å, Cnt(1)—Ho—Cnt(2) = 128.5°, Cnt(1)—Ho—Cl(1,2) = 107.9, 103.2°, Cnt(2)-Ho-Cl(1,2) = 110.6, 104.4°, and Cl(1)—Ho—Cl(2) = 97.17 (6)° (Cnt = C2B3 centroid). One of the exo-polyhedral Li(TMEDA) units is linked to both opposing C2B3 faces via three B-H(terminal) bonds and the other interacts with only one of the C2B3 faces via two B-H(terminal) groups with an additional linkage to the central Ho atom via an Ho-Cl—Li bridge.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S010827019501273X
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