Building three-dimensional metal phosphites from the corner-shared four-membered rings chain

Three new compounds, a one-dimensional (1D) zinc phosphite, (C4H8N2H4)[Zn(HPO3)2] (I), two three-dimensional (3D) metal phosphites (C4H8N2H4)[Zn3(HPO3)4] (II) and (C4H8N2H4)[Zn(3−x)Cox(HPO3)4(H2O)2] (x≈0.83) (III) have been synthesized under hydrothermal conditions templated by piperazine and characterized by single-crystal X-ray diffraction, XRD, IR, UV-vis spectra and SQUID magnetometer. Compound I displays 1D chain-like structure, containing corner-shared (cs) four-membered rings. Interestingly, the structures of II and III show 1D chains similar to those observed in I. It is noteworthy that III represents the first cobalt-substituted zinc-phosphite. Crystal data: I, monoclinic, C2/c, a=17.748(2) A, b=7.428(9) A, c=8.8071(11) A, β=105.345(3)°, V=1091.9 A3, Z=4. II, Monoclinic P21/c, a=9.9435(4) A, b=10.1438(3) A, c=17.8164(5) A, β=95.665(2)°, V=1788.27 A3, Z=4, and III, Monoclinic P21/c, a=7.2338(2) A, b=15.0238(5) A, c=9.2153(3) A, β=107.741(2)°, V=953.88(5) A3, Z=2.