One new organic adduct,isonicotinamide·3,5-dinitrosalicylic acid with isonico-tin-amide（ina） and 3,5-dinitrosalicylic acid（3,5-dnsa） in 1：1 molar ratio,has been synthesized.Its struc-ture（C13H10N4O8,Mr = 350.25） was characterized by elemental analysis,IR and single-crystal X-ray diffraction analysis.The crystal belongs to the triclinic system,space group P1,with a = 8.812（4）,b = 9.487（5）,c = 9.604（6） ,α = 116.54（2）,β = 97.29（5）,γ = 98.35（4）°,V = 693.8（7） 3,Z = 2,Dc = 1.677 g/cm3,λ（MoKα） = 0.71073 ,μ = 0.142 mm-1,F（000） = 360,the final R = 0.0539 and wR = 0.1402 for 2417 unique reflections（Rint = 0.0288） with 1819 observed ones（Ⅰ 〉 2σ（Ⅰ））.Proton transfer reaction occurs between 3,5-dnsa and ina molecules,and the hydrogen bonds（N-H…O and C-H…O） with other interactions（π…π stacking and weak interactions of O…O and C…O） cooperatively construct a three-dimensional（3D） supramolecular structure.
Two new binary cocrystals formulated as POM·NBA 1 and POM·DNSA 2 （POM = 3-methyl-4-nitro-pyridine-N-oxide, NBA = o-nitrobenzoic acid, DNSA = 3,5-dinitrosalicylic acid） have been successfully synthesized and characterized by elemental analysis, IR and X-ray single- crystal diffraction analysis. The crystal of 1 crystallizes in triclinic, space group P1, with a = 7.621（4）, b = 7.816（4）, c = 11.702（5） , α = 87.957（10）, β = 83.642（10）, γ = 81.535（10）o, C13H11N3O7, Z = 2, Mr = 321.25, V = 685.1（6） 3, Dc = 1.557 g/cm3, F（000） = 332, μ = 0.129 mm-1, the final R = 0.0632 and wR = 0.0831. The crystal of 2 crystallizes in monoclinic, space group P21/c with a = 14.910（9）, b = 5.904（3）, c =19.321（12） , β = 110.583（10）o, C13H10N4O10, Z = 4, Mr = 382.25, V = 1592.1（16） 3, Dc = 1.595 g/cm3, F（000） = 784, μ = 0.140 mm-1, the final R = 0.0598 and wR = 0.1589. Further structure analysis reveals that the POM with NBA and DNSA molecules in 1 and 2 are linked into 3D structures by the combination of strong O-H…O and weak C-H…O hydrogen bonds, π…π stackings and diverse short contacts, in which different C-H…O weak hydrogen bonds may play a key role in constructing the network structures.
An acentric complex, [Sm（HCOO）3]n （1）, was hydrothermally synthesized and characterized by single-crystal X-ray diffraction, IR, and element analysis. Complex 1 crystallized in the rhombohedral system with acentric space group R3m and afforded a three-dimensional （3D） structure. Interestingly, ferroelectric and magnetic studies revealed that complex 1 demonstrated both ferroelectric and antiferromagnetic properties.
