Nine metal compounds of Mn(II), Zn(II) and Cd(II) derived from dinitropyridone ligands (3,5-dinitropyrid-2-one, 2HDNP; 3,5-dinitropyrid-4-one, 4HDNP and 3,5-dinitropyrid-4-one-N- hydroxide, 4HDNPO) were characterized by elemental analysis, FT-IR and partly by TG-DSC. Three of which were further structurally characterized by X-ray single-crystal diffraction analysis. The structures of the three compounds, Mn(4DNP)2(H2O)4, 4, Zn(4DNPO)2(H2O)4, 8, and Cd(4DNPO)2(H2O)4, 9, crystallize in the monoclinic space group P2(1)/n and Z = 2, with a = 8.9281(9), b = 9.1053(9), c = 10.6881(11) Å, β = 97.9840(10)° for 4; a = 8.4154(7), b = 9.9806(8), c = 10.5695(8) Å, β = 97.3500(10)° for 8; a = 8.5072(7), b = 10.2254(8), c = 10.5075(8) Å, β = 96.6500(10)° for 9. All three complexes are octahedral consisting of four equatorial water molecules, and two nitrogen or oxygen donor ligands (DNP or DNPO). The abundant hydrogen-bonding and π-π stacking interactions seem to contribute to stabilization of the crystal structures of the compounds. The TG-DTG results revealed that the complexes showed a weight loss sequence corresponding to all coordinated water molecules, nitro groups, the breaking of the pyridine rings and finally the formation of metal oxides.Graphical AbstractNine transition-metal compounds of Mn(II), Zn(II) and Cd(II) derived from 3,5-dinitropyridone were synthesized and three were characterized by X-ray single-crystal diffraction analysis. Each of the complexes exhibits distorted octahedral geometry with four water molecules on the equatorial positions and two ligand molecules on the axial positions. The abundant hydrogen-bonding and π-π stacking interactions seem to contribute to stabilization of the crystal structures of the compounds.

中文翻译：

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3,5-二硝基吡啶酮衍生的过渡金属化合物的合成、结构表征和热分析

源自二硝基吡啶酮配体（3,5-二硝基吡啶-2-one、2HDNP；3,5-二硝基吡啶-4-one、4HDNP和3,5）的九种金属化合物Mn(II)、Zn(II)和Cd(II) -dinitropyrid-4-one-N-氢氧化物，4HDNPO) 通过元素分析、FT-IR 和部分通过 TG-DSC 进行表征。其中三个进一步通过 X 射线单晶衍射分析进行结构表征。Mn(4DNP)2(H2O)4, 4, Zn(4DNPO)2(H2O)4, 8 和 Cd(4DNPO)2(H2O)4, 9 三种化合物的结构在单斜空间群中结晶P2(1)/n 和 Z = 2，a = 8.9281(9)，b = 9.1053(9)，c = 10.6881(11) Å，β = 97.9840(10)° 4；a = 8.4154(7), b = 9.9806(8), c = 10.5695(8) Å, β = 97.3500(10)° 8；a = 8.5072(7), b = 10.2254(8), c = 10.5075(8) Å, β = 96.6500(10)° 9. 所有三个配合物都是由四个赤道水分子组成的八面体，和两个氮或氧供体配体（DNP 或 DNPO）。丰富的氢键和 π-π 堆积相互作用似乎有助于稳定化合物的晶体结构。TG-DTG结果表明配合物表现出与所有配位的水分子、硝基、吡啶环断裂和最终形成金属氧化物相对应的失重顺序。图形摘要Mn(II)的九种过渡金属化合物，合成了衍生自 3,5-二硝基吡啶酮的 Zn(II) 和 Cd(II)，并通过 X 射线单晶衍射分析对三种进行了表征。每个配合物都表现出扭曲的八面体几何形状，赤道位置有四个水分子，轴向位置有两个配体分子。