Phosphanotriylbenzenecarboxylic acid (ptbcH3; P(C6H4-p-CO2H)3) and its methyl phosphonium iodide derivative (mptbcH3I; H3CP(C6H4-p-CO2H)3}I) have been used as organic building blocks in reaction with Zn(II) salts to obtain a series of related two-dimensional coordination polymers with honeycomb-like networks. The variable coordination number and oxidation states available to phosphorus have been exploited to produce a family of related phosphine coordination materials (PCMs) using a single ligand precursor. The phosphine carboxylate trianion, ptbc3â, reacted with Zn(II) to form 3,3-connected undulating hexagonal sheets based on tetrahedral P and Zn nodes, where Znâptbc = 1 : 1. When hydroxide was used as an additional framework ligand, Zn4(OH)2 clusters were obtained. The clusters support 6,3-connected bilayers that consist of pairs of fused hexagonal sheets (Znâptbc = 2 : 1) with intra-layer pore spaces. The Zn4(OH)2 clusters are also coordinated by solvent, which was preferentially displaced when the bilayer material was synthesized in the presence of ethylene diamine. Treatment of ptbc3â with MeI resulted in methylation of the phosphine to give the P(V) phosphonium iodide salt derivative. The formally dianionic methylphosphonium tricarboxylate building block, mptbc2â, has the same trigonal-pyramidal bridging geometry as the parent phosphine. However, mptbc2â reacted with Zn(II) on a 1 : 1 stoichiometric ratio to give an unusual trilayer sheet polymer that is based exclusively on 3-connected nodes. Solid-state 31P NMR studies confirmed that the phosphine ligands were resistant to oxidation upon solvothermal reaction under aerobic conditions.
磷酸三
苯甲酸(ptbcH3;P(
C6H4-p-CO2H)3)及其
甲基膦铵碘化物衍
生物(mptbcH3I;H3CP( -p-CO2H)3}I)作为有机构建块,与Zn(II)盐反应生成一系列相关的二维配位聚合物,具有类似蜂窝的网络。利用
磷的可变配位数和氧化态,采用单一
配体前体合成了一系列相关的膦配位材料(PCMs)。膦
羧酸三阴离子ptbc3-与Zn(II)反应形成基于四面体P和Zn节点的3,3连接的波动六角片,其中Zn-ptbc = 1:1。当使用氢氧化物作为额外框架
配体时,获得了Zn4(OH)2簇。该簇支撑由配对融合的六角片组成的6,3连接的双层,Zn-ptbc = 2:1,具有层内孔隙。Zn4(OH)2簇还与溶剂配位,当在
乙二胺存在下合成双层材料时,溶剂优先被取代。将ptbc3-与MeI处理后,导致膦的甲基化,生成P(V)膦
铵碘化盐衍
生物。形式上为二阴离子
甲基膦三羧酸盐构建块mptbc2-具有与母体膦相同的三角锥桥接几何结构。然而,mptbc2-与Zn(II)按1:1的
化学计量比反应,生成一种仅基于3连接节点的异常三层片状聚合物。固态31P NMR研究确认在有氧条件下的溶液热反应中,
膦配体对氧化具有抗性。