First- and second-sphere co-ordination of a lanthanum cation by a calix[4]arene tetraamide in the partial-cone conformation
Abstract
5,11,17,23-Tetra-tert
-butyl-25,26,27,28-tetrakis(diethylcarbamoylmethoxy)calix[4]arene (L)
has been synthesized in the partial-cone conformation for the first
time. Reaction with lanthanum picrate (2,4,6-trinitrophenolate) gives a
1∶1 complex which has been structurally characterised:
[LaL(pic)
3
(H
2
O)
2
]·3H
2
O·MeCN (triclinic, space group P![[1 with combining macron]](https://www.rsc.org/images/entities/char_0031_0304.gif)
,
Z = 2, R = 0.087 for
10 150 independent reflections above background). The
metal–calixarene interactions involve two amide oxygen atoms in
the first co-ordination sphere and three oxygen atoms (two ether and one
amide) in the second. The remainder of the first co-ordination sphere of
the nine-co-ordinate lanthanum cation consists of two water oxygen atoms
and oxygen atoms of the three picrate anions.
,
Z = 2, R = 0.087 for
10 150 independent reflections above background). The
metal–calixarene interactions involve two amide oxygen atoms in
the first co-ordination sphere and three oxygen atoms (two ether and one
amide) in the second. The remainder of the first co-ordination sphere of
the nine-co-ordinate lanthanum cation consists of two water oxygen atoms
and oxygen atoms of the three picrate anions.
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