Structural Systematics of 2/4-Nitrophenoxide Complexes of Closed-Shell Metal Ions. II 4-Nitrophenoxides of Group 1

Abstract

Room-temperature single-crystal X-ray studies are recorded for 4-nitrophenoxide (4-np¯) salts, variously hydrated, of the Group 1 metals, M(4-np-).χH2O, for M = Li, Na (redetermination), K (already recorded), Rb and Cs. Li(4-np).3H2O is monoclinic, space group Pc, a 11·359(3), b 7·518(3), c 10·855(4) Å, β 90·56(3)°, Z = 4; conventional R on |F| was 0·056 for No 2098 independent `observed" (I > 3σ(I)) reflections. Na(4-np).2H2O is orthorhombic, Ima2, a 6·888(6), b 19·699(8), c 6·436(8) Å, Z = 4, R 0·031 for No 664. Rb(4-np).H2O is orthorhombic, Pbca, a 11·82(3), b 19·724(7), c 7·199(1) Å, Z = 8, R 0·036 for No 1465. Cs(4-np).3H2O is monoclinic, P 21/c, a 13·337(2), b 12·770(5), c 6·311(2) Å, β 100·56(3)°, Z = 4, R 0·031 for No 2636. Whereas the lithium compound is essentially a discrete mononuclear neutral molecular complex [(4-np-O)Li(OH2)3] with four-coordinate lithium, the other compounds exhibit two- or three-dimensional sheet polymer structures with 4-nitrophenoxide moieties providing O-C6H4-NO2 head-tail connecting motifs between successive metal atoms.