Syntheses, Structures and Properties of Two Luminous Mercury(II) Bromides Containing Tridentate N-Donor Schiff Bases: Control of Coordination Number and Nuclearity by Varying Ligand Matrices
作者:Smita Satapathi、Somnath Choubey、Sumitra Das、Kishalay Bhar、Rajarshi Ghosh、Partha Mitra、Barindra Kumar Ghosh
DOI:10.1007/s10870-012-0359-9
日期:2012.10
Mononuclear [Hg(L1)Br2] (1) and 1D polymer [Hg2(L2)Br4]n (2) [L1 = (N,N-diethyl,N′-(pyridin-2-yl)formylidene)ethane-1,2-diamine and L2 = (N,N-diethyl,N′-(pyridin-2-yl)benzylidene)ethane-1,2-diamine] have been synthesized using appropriate molar ratios of HgBr2 and L1/L2 in methanol–acetonitrile solution mixtures at room temperature. Crystal structures were investigated with the help of single crystal X-ray diffraction data. In 1, the mercury(II) center adopts a distorted square pyramidal geometry bound by three N atoms of L1 and two terminal bromides. Compound 2 forms a 1D chain through Hg–Br–Hg bridges in an infinite fashion connecting two crystallographically independent mercury(II) centers; Hg1 is in a distorted square pyramidal environment coordinated by three N atoms of L2 and two bridging bromides, whereas Hg2 adopts a tetrahedral geometry bound by two terminal and two bridging bromides. 1 and 2 display intraligand 1(π−π*) fluorescence in DMF solutions at room temperature.
单核[Hg(L1)Br2](1)和一维聚合物[Hg2(L2)Br4]n(2)[L1 = (N,N-二乙基,N′-(吡啶-2-基)亚甲酰基)乙烷-1,2-二胺和 L2 = (N,N-二乙基,N′-(吡啶-2-基)亚苄基)乙烷-1,2-二胺室温下,在甲醇-乙腈混合溶液中使用适当摩尔比的 HgBr2 和 L1/L2 合成了 (N,N-二乙基,N′-(吡啶-2-基)亚苄基)乙烷-1,2-二胺。利用单晶 X 射线衍射数据对晶体结构进行了研究。在化合物 1 中,汞(II)中心呈扭曲的正方金字塔形,由 L1 的三个 N 原子和两个末端溴化物结合。化合物 2 通过 Hg-Br-Hg 桥形成了一条一维链,以无限的方式连接了两个晶体学上独立的汞(II)中心;Hg1 处于扭曲的正方金字塔环境中,由 L2 的三个 N 原子和两个桥接溴原子配位,而 Hg2 则采用四面体几何结构,由两个末端溴原子和两个桥接溴原子结合。1 和 2 在室温下的 DMF 溶液中显示出配位体内部 1(π-π*)荧光。