Synthesis, structure and near-infrared luminescence of a new 2D praseodymium(III) coordination polymer

A novel coordination polymer, [Pr-2(BIPA)(3)(H2O)(2)]center dot 2H(2)O (1) (H(2)BIPA=5-bromoisophthalic acid), was prepared by hydrothermal synthesis and characterized by IR spectroscopy, elemental analysis and single-crystal X-ray diffraction. The crystal was of monoclinic system, space group C2/c, with a=1.98037(14), b=1.44189(14), c=2.15281(18) nm, beta=95.220(2)degrees, V=6.1218(9) nm(3), C24H17Br3O16Pr2, M-r=1082.93, D-c=2.350 g/cm(3), F(000)=4096, mu=7.136 mm(-1) and Z=8. The final R-1=0.0608 and wR(2)=0.1371 for 5624 observed reflections (I>2 sigma(I)). Complex 1 featured an interesting 2D layer containing {Pr-2(CO2)(3)}(n) right-handed and left-handed helical chains. Furthermore, hydrogen bonds linked the adjacent 2D layers to form a 3D supramolecular framework. Moreover, the near-infrared luminescent properties of 1 were also investigated in the solid state.