Room-temperature, single-crystal X-ray studies are recorded for the variously
hydrated Group 1 metal derivatives of 2-nitrophenol (2-npH =
C6H5NO3). A
provisional determination is reported for
Li(2-np).½H2O, set as monoclinic,
P21/c, a
3·535(3), b 15·06(1),
c 24·42(2) Å, β 91·7(1)°,
Z = 8, conventional R on
F currently 0·18 for
No 875 ‘observed’
(I > 3σ(I)) reflections.
Na(2-np).H2O is monoclinic,
C2/c, a
34 ·23(2), b 3·624(4),
c 35·48(2) Å, β 91·24(4)°,
Z = 24, R 0·060 for
No 1371. Rb(2-np).½
H2O is monoclinic,
C2/c (isomorphous with the
previously determined potassium analogue), a
25·269(9), b 5·381(5),
c 12·010(3) Å, β 105·35(3)°,
Z = 8, R 0·046 for
No 1380.
Cs(2-np).½H2O is monoclinic,
P21/n, a
7·648(3), b 26·19(1),
c 8·713(6) Å, β 111·75(2)°,
Z = 8, R 0·061 for
No 2347. All compounds except the
lithium derivative are two-dimensional polymeric sheets in which the aromatic
rings project to either side of a core of metal atoms coordinated by a web of
2-nitrophenoxide oxygen atoms in various bridging functionalities. The lithium
compound is a novel ‘stair’ polymer with two crystallographically
independent lithium atoms at successive independent Li–O crossbars, the
oxygen atoms of which are phenoxide-Oof each of the two
independent ligands. The lithium atoms are alternately four- and
five-coordinate, the fourth coordination site of the first being occupied by
the water molecule oxygen atom, while the fourth and fifth sites of the second
are occupied by the cis-2-nitro oxygen atoms of the two
ligands
Nucleofugal behavior of a β-shielded α-cyanovinyl carbanion
