Hydrothermal reactions of mononuclear oxochloromolybdate(V) with oxalic acid in alcohol (methanol or 2-propanol) and pyridines (pyridine or 3-methylpyridine) media have afforded two polymeric compounds of molybdenum(V): N-methylpyridinum catena-μ-oxalato-O1,O2:O1â²,O2â²-(dichloro-di-μ-oxo-dioxodimolybdate(V)), (MeNC5H5)2n[Mo2O4(C2O4)Cl2]n1 and 3-methylpyridinium catena-μ-oxalato-O1,O2:O1â²,O2â²-(dichloro-di-μ-oxo-dioxodimolybdate(V)), (3-MePyH)2n[Mo2O4(C2O4)Cl2]n2. The compounds were fully characterized by X-ray structural analysis, infrared and NMR spectroscopy. The essentially isostructural anionic chains in 1and 2 are built of alternating pairs of Mo2O4}2+ containing edge-sharing octahedra and planar oxalates giving a Mo â¶ oxalate ratio of 2. The bisbidentate oxalate acts as a bridge between two dinuclear subunits. The formation of a N-methylpyridinium cation from methanol and pyridine in the presence of molybdenum(V) and oxalic acid has not been documented before.
单核
氯代
钼酸盐(V)与
草酸在
乙醇(
甲醇或2-
丙醇)和
吡啶(
吡啶或3-
甲基吡啶)介质中发生
水热反应,得到两种
钼(V)聚合物:N-
甲基吡啶链-μ-
草酸根- O1,O2:O1‐,O2‐‐(二
氯-二-μ-氧代-二氧二
钼酸盐(V)), (MeNC5H5)2n[ (
C2O4)Cl2]n1 和 3-
甲基吡啶链-μ-
草酸-O1 ,O2:O1-,O2--(二
氯-二-μ-氧代-二氧二
钼酸盐(V)),(3-MePyH)2n[ ( )Cl2]n2。通过X射线结构分析、红外光谱和核磁共振光谱对这些化合物进行了充分表征。 1和2中基本上同构的阴离子链由交替对的
Mo2O4}2+组成,包含边缘共享八面体和平面
草酸盐,Mo与
草酸盐的比率为2。二齿
草酸盐充当两个双核亚基之间的桥梁。在
钼(V)和
草酸存在下,
甲醇和
吡啶形成 N-
甲基吡啶鎓阳离子之前尚未有文献报道。