Abstract
| Language | English |
|---|---|
| Pages | 2141-2147 |
| Number of pages | 7 |
| Journal | Journal of the Chemical Society, Dalton Transactions |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 1987 |
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Keywords
- tetrameric pseudo-cubane
- dimer
- crystal structures
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The syntheses and crystal structures of two iminolithium adducts: (Ph2CNLi·NC5H5)4, a tetrameric pseudo-cubane formed by stacking two (LiN)2 four-membered rings, and [But2CNLi·OP(NMe2)3]2, a dimer prevented sterically from stacking. / BARR, D ; SNAITH, R ; CLEGG, W ; Mulvey, Robert; WADE, K .
In: Journal of the Chemical Society, Dalton Transactions, No. 9, 09.1987, p. 2141-2147.Research output: Contribution to journal › Article
TY - JOUR
T1 - The syntheses and crystal structures of two iminolithium adducts: (Ph2CNLi·NC5H5)4, a tetrameric pseudo-cubane formed by stacking two (LiN)2 four-membered rings, and [But2CNLi·OP(NMe2)3]2, a dimer prevented sterically from stacking
AU - BARR, D
AU - SNAITH, R
AU - CLEGG, W
AU - Mulvey, Robert
AU - WADE, K
PY - 1987/9
Y1 - 1987/9
N2 - The syntheses and crystal structures of two iminolithium adducts [But2CNLi·OP(NMe2)3]2(1)[OP(NMe2)3= hexamethylphosphoramide (hmpa)] and (Ph2CNLi·NC5H5)4(2)(NC5H5= pyridine) are described. Adduct (1) contains a centrosymmetric planar (LiN)2 ring, with Li–N distances of 1.923(6) and 1.948(6)Å, and a ring angle at nitrogen of 75.4(3)°. Unexpectedly, the C2CN skeletal planes of its imino ligands are twisted 58.6(6)° with respect to the (LiN)2 ring plane, apparently to accommodate the bulky hmpa ligands, so preventing the (LiN)2 rings from stacking to form an (LiN)4 cubane structure. In contrast, adduct (2), with sterically compatible Ph2CN and NC5H5 ligands, has an (LiN)4 cubane structure with three distinct categories of metal–nitrogen distance (averaging 2.03,2.08, and 2.16 Å respectively) and ligand orientations that support an interpretation of this cubane in terms of two stacked (LiN)2 four-membered ring systems.
AB - The syntheses and crystal structures of two iminolithium adducts [But2CNLi·OP(NMe2)3]2(1)[OP(NMe2)3= hexamethylphosphoramide (hmpa)] and (Ph2CNLi·NC5H5)4(2)(NC5H5= pyridine) are described. Adduct (1) contains a centrosymmetric planar (LiN)2 ring, with Li–N distances of 1.923(6) and 1.948(6)Å, and a ring angle at nitrogen of 75.4(3)°. Unexpectedly, the C2CN skeletal planes of its imino ligands are twisted 58.6(6)° with respect to the (LiN)2 ring plane, apparently to accommodate the bulky hmpa ligands, so preventing the (LiN)2 rings from stacking to form an (LiN)4 cubane structure. In contrast, adduct (2), with sterically compatible Ph2CN and NC5H5 ligands, has an (LiN)4 cubane structure with three distinct categories of metal–nitrogen distance (averaging 2.03,2.08, and 2.16 Å respectively) and ligand orientations that support an interpretation of this cubane in terms of two stacked (LiN)2 four-membered ring systems.
KW - tetrameric pseudo-cubane
KW - dimer
KW - crystal structures
U2 - 10.1039/DT9870002141
DO - 10.1039/DT9870002141
M3 - Article
SP - 2141
EP - 2147
JO - Journal of the Chemical Society, Dalton Transactions
T2 - Journal of the Chemical Society, Dalton Transactions
JF - Journal of the Chemical Society, Dalton Transactions
SN - 0300-9246
IS - 9
ER -