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作 者:谭育慧[1] 熊剑波[1] 黄珺[1] 高继兴 徐庆[1] 于银梅[1] 王艳[1] 杨斌[1] 舒庆[1] 唐云志[1]
机构地区:[1]江西理工大学冶金与化学工程学院,赣州341000
出 处:《无机化学学报》2014年第7期1621-1628,共8页Chinese Journal of Inorganic Chemistry
基 金:国家自然基金(No.21261009);江西省科技厅科技支撑计划研究项(20133BBE50020);国家863计划项目(2012AA061901);江西省教育厅科研项目(GJJ13434);江西理工大学博士启动基金(JXXJBS13003)资助项目
摘 要:利用氰基吡啶(4-氰基吡啶和3-氰基吡啶)与稀土硝酸盐作用(Ln=Nd,Eu,Yb),通过原位[2+3]环加成反应合成得到了4个稀土四唑离子型化合物,Ln(H2O)8·3(p—TPD)·2(P—HTPD)·7H2O),(Ln=Nd(1),Eu(Z),Yb(3)),p-TPD=4-tetrazoylpyridine,p-HTPD=protonated 4-tetrazoylpyridine)以及Ln(H2O)8·3(m-TPD)·6H2O(m—TPD=3-tetrazoylpyridine,Ln=Yb(4))。X-射线单晶结构分析显示,在配合物1-4中,稀土金属离子与配体分别处于不同的两层,[Ln(H2O)8]^3+结构单元与p—TPD以及水分子通过氢键作用形成阳离子层(A层),同时p-TPD与p-HTPD通过π-π堆积与氢键作用形成阴离子层(B层)。固态荧光分析表明,配合物1,2,4在405、400、494am处出现了最大强度的发射峰值;而配合物3在618、592及462nm出现了最大强度的发射峰值。热重分析表明配合物1-4在70—120℃范围内有1个失重.而在180~220℃范围内配合物开始分解。Hydrothermal reaction of 4-cyanopyrine (or 3-cyanopridine) and NaN3 in the presence of Lewis acid lanthanide nitrate (Ln=Nd, Er, Yb) offers a serial of interesting ionic compounds Ln(H2O)8·3(p-TPD).2(p-HTPD)· 7H2O), (Ln=Nd(1), Eu(2), Yb(3))p-TPD=4-tetrazoylpyridine, p-HTPD=protonated 4-tetrazoylpyridine) and Ln(H2O)8· 3(m-TPD) ·6H2O (m-TPD=3-tetrazoylpyridine, Ln=Yb(4)). Single-crystal X-ray structure determination shows that all the compounds 1 -3 exhibit ionic layer structure in which the vertical spread p-TPD groups and the central metal cation [Ln(H2O)8]^3+ constructed the cationic layer (A layer) through the hydrogen bonds among the p-TPD groups and coordinated water molecules and the co-crystallized water molecules, part of the p-TPD and p-HTPD groups arrange along the zonal orientation formed the anionic layer (B layer) via π-π stacking and hydrogen bonds. Compound 4 shows the similar ionic layer structure as compounds 1-3. The solid-state fluorescence spectra of crystalline samples for 1 -3, and 4 indicate their maximal emission peaks occur in 405, 400 and 494 nm respectively, while compound 2 emits near-infrared luminescence with maximal emission peaks 618, 592 and 462 nm at room temperature. Thermo-gravimetric analysis (TGA) data shows all the compounds have a weightloss around 70-120 ℃ and start decomposition around 180-220 ℃.
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