A neodymium (Nd)–mercury (Hg) complex [Nd(IA)₂(H₂O)₃(NO₃)(HgCl₂)] _n ·2nH₂O·nEtOH (1; IA is isonicotinic acid anion) was synthesised and characterised. Compound 1 is of monoclinic system, space group C2/c with a = 25.4224(12), b = 8.1410(3), c = 22.2963(9) Å, β = 90.788(4)°, V = 4614.1(3) ų, C₁₄H₂₄Cl₂HgN₃NdO₁₃, Z = 8, M _r = 858.09, D _c = 2.471 g/cm³, S = 1.120, μ(Mo Kα) = 9.174 mm⁻¹, F(000) = 3256, R = 0.0530 and wR = 0.1288. The mercury (II) (Hg²⁺) ions are bound by two terminal chloride (Cl⁻) ions and two nitrogen (N) atoms, displaying a distorted tetrahedral geometry. The neodymium (III) (Nd³⁺) ion is coordinated with nine oxygen (O) atoms to form a monocapped square antiprismatic polyhedron. Every two neighbouring neodymium (III) ions are interlinked by two μ ₃-bridging IA groups to form a one-dimensional (1D) infinite –Nd–IA₂–Nd– chain. The 1D chains link to each other through HgCl₂N₂ tetrahedra and yield a two-dimensional layer. It emits cyan photoluminescence, which should be due to the ⁴ G _11/2 → ⁴ I _9/2 transition of the 4f electrons of the neodymium ions. It exhibits Commission Internationale de l’Éclairage chromaticity coordinates of (0.1274, 0.3525). A solid-state diffuse reflectance spectrum unveils that it has a 2.51 eV band gap.

中文翻译：

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镧系元素-汞化合物：制备和光物理性质

钕（Nd）-汞（Hg）络合物[Nd（IA）₂（H ₂ O）₃（NO ₃）（HgCl ₂）] _n ·2 n H ₂ O· n EtOH（1； IA为异烟酸阴离子）进行了合成和表征。化合物1是单斜晶系，空间群C 2 / c具有a = 25.4224（12），b = 8.1410（3），c = 22.2963（9）Å，β = 90.788（4）°，V = 4614.1（3）埃³，C ₁₄ H ^ ₂₄氯 ₂ HGN ₃ NDO ₁₃，Ž = 8，中号 _[R = 858.09，d _Ç =2.471克/厘米³，小号= 1.120，μ（钼Kα）=9.174毫米^-1，˚F（000）= 3256，- [R = 0.0530和wR = 0.1288。汞（II）（汞²⁺）离子通过两个末端氯（CL结合^- ）离子和两个氮（N）原子，显示扭曲的四面体几何形状。钕（Nd ³⁺离子与9个氧（O）原子配位以形成单峰方形反棱柱多面体。每两个相邻的钕（III）离子被两个相通μ _3个-bridging IA组以形成一个一维（1D）无限-Nd-IA ₂ -Nd-链。1D链通过HgCl ₂ N ₂四面体彼此连接，并产生二维层。它发出青色的光致发光，这应归因于⁴ G _11/2 → ⁴ I _9/2钕离子的4f电子跃迁。它具有（0.1274，0.3525）的国际照明委员会色度坐标。固态漫反射光谱显示其带隙为2.51 eV。