摘要
在Cu(acac) 2 甲醇溶液和Na3 BTC水溶液 (acac =乙酰丙酮 ,H3 BTC =1,3 ,5 均苯三羧酸 )的混合体系中制得绿色配位聚合物 {[NaCu(BTC) (H2 O) 4 ]·2H2 O}n.利用元素分析、X射线单晶衍射、红外光谱、荧光光谱及热重分析对聚合物进行表征 .晶体属单斜晶系 ,空间群为C2 /c ,晶胞参数a =2 165 7( 1)nm ,b =1 12 15 5 ( 5 )nm ,c =1 3 5 2 91( 7)nm ,β =12 2 3 79( 1)° ,V =2 775 2 ( 2 )nm3 ,Mr=40 1 74,Dc=1 92 3Mg·m-3 ,Z =8,μ(MoKα) =1 672mm-1,F( 0 0 0 ) =164 0 ,GOF =1 0 14 ,R =0 0 2 76,wR =0 0 766.晶体的基本构建单元中包含两个金属中心 (Cu2 + 和Na+ )、一个配位的BTC分子和四个配位的水分子 .基本构建单元通过相互链接形成具双层结构的二维网状聚合物 .化合物中金属中心Cu2 + 与Na+ 之间存在金属 -金属相互作用 ,形成无限的一维类金属线聚合物 .荧光光谱表明 ,常温下在λex=3 14nm激发后 ,配位聚合物在 42
The title complex {[NaCu(BTC)(H 2O) 4]·2H 2O} n (H 3-BTC=1,3,5-benzenetricarboxylic acid) has been synthesized by the reaction of Cu(acac) 2 (acac=acetylacetone) and Na 3BTC in the mixed solvent of methanol and water. The compound was characterized by single-crystal X-ray diffraction analysis, infrared spectrum, fluorescent spectrum and TGA. The crystal structure is of monoclinic, space group C2/c with a=2 1657(1) nm, b= 1 12155(5) nm, c=1 35291(7) nm, β=122 379(1)°, V=2 7752(2) nm 3, M r=401 74, D c= 1 923 Mg·m -3, Z=8, μ(Mo Kα)=1 672 mm -1, F(000)=1640, GOF=1 014. A total of 13298 reflections were collected of which 3339 were unique. The structure was refined to R=0 0276 and wR=0 0766 for 3176 observed reflections with I>2σ(I). The crystal structure forms two-dimensional double-sheet network by the extension of copper(II)/sodium(I) trimesate and bridging aqua ligands. There is an obvious interaction between metal ions Cu(II) and Na(I) in the compound, which gives an infinite one-dimensional quasi-metal string complex. Moreover, the complex gives a strong fluorescent emission band at 420 nm (λ ex=314 nm) in the solid state at room temperature.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第23期2323-2328,共6页
Acta Chimica Sinica
基金
国家自然科学基金 (No.2 0 1 71 0 1 2 )
福建省自然科学基金 (No.E0 1 1 0 0 1 0 )资助项目
