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At the same condition, utilizing the different of base, the authors
constructed two wholly different compounds, 1 and 2. Compounds
1 and 2 are one-dimensional (1D) chainlike, while the coordination
mode of dicyandiamide is different in both complexes. In 1, the
dicyandiamide is μ1,5-dca bridged coordination mode; in 2, that is
μ1,3-dca bridged coordination mode. Two new heterobinuclear nickel and sodium polymers [NiNa(L)(dca)]n (1) and [NiNa(L(dca)]2n·
(CH3COOCH3)n·(H2O)n, (2)[where H2L = N,N-bis(3-ethoxy- salicylidene)ethylenediamine, dca = N(CN)2–], were synthesized and characterized by elemental analysis and X-ray crystal diffraction. The heterobinuclear complex 1, C22H22N5NaNiO4, crystallizes in the monoclinic system space group P21/c, with a = 8.0955 (7) ?, b = 22.1988 (18) ?, c = 12.9314 (11) ?; β = 103.4700(10)?; Z = 4; S = 1.01; V = 2260.0(3) ?3; DCalcd = 1.476 gcm–3; F(000) = 1040; μ = 0.92 mm–1; R1 = 0.041; wR2 = 0.104. The complex 2, C23.50H27N5Na
NiO5.50, the crystals belong to the monoclinic system, space group C2/c,with a = 31.553 (8) ?, b = 12.836 (3) ?, c = 13.264 (3) ?; β = 111.234 (4)?; Z = 8; S = 0.95; V = 5007.6 (19)?3; DCalcd = 1.457
gcm–3; F(000) = 2288; μ = 0.84 mm–1; R1 = 0.072; wR2 = 0.211.
Complexes 1 and 2 are both axisymmetric heterobinuclear nickel
complexes. The geometry around nickel atoms can be described
as a slightly distorted plane geometry, and sodium atoms that as a
slightly distorted octahedral geometry. Complexes 1 and 2 are both
one-dimensional (1D) chainlike supramolecular structure bridged
by dicyandiamide to form the polymer. The coordination mode of
dicyandiamide is different in both complexes. In 1, the dicyandiamide is μ1,5-dca bridged coordination mode; in 2, that is μ1,3-dca bridged coordination mode by dicyandiamide. |
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