A series of metal–organic polymers assembled from MCl<sub>2</sub>(M = Zn, Cd, Co, Cu): structures, third-order nonlinear optical and fluorescent properties
作者:Huayun Han、Yinglin Song、Hongwei Hou、Yaoting Fan、Yu Zhu
DOI:10.1039/b514431k
日期:——
In this paper four metalâorganic polymers [Zn(fcz)Cl2]·CH3OH}n1, [Cd(fcz)2Cl2]·CH3OH·2H2O}n2, [Co(fcz)2Cl2]·2CH3OH}n3 and [Cu(fcz)2Cl2]·2CH3OH}n4 (fcz = fluconazole: α-(2,4-difluorophenyl)-α-(1H-1,2,4-triazol-l-ylmethyl)-1H-1,2,4-triazole-l-ethanol) were synthesized and characterized by X-ray single crystal diffraction. Polymer 1 consists of 1-D infinite chains arranged along the b-axis. All of polymers 2â4 exhibit a 2-D rhombohedral grid structure. We study the third-order nonlinear optical properties of fcz and polymers 1â4 in DMF solution by using 8 ns laser pulses at 532 nm, and find that 1 and 4 exhibit different NLO properties from fcz and both 2 and 3 show similar NLO properties to fcz. 1 possesses strong NLO refractive effects and large NLO absorptive behaviors. 2, 3 and fcz exhibit strong refractive effects, but their NLO absorptive behaviors are weaker than that of 1. The NLO effects of 4 are very weak. The study of optical limiting (OL) effects by using 40 ps laser pulses at 532 nm shows that fcz and polymer 3 possess a strong OL effect. The optical limiting threshold values of 0.15 J cmâ2 for fcz and 0.16 J cmâ2 for 3 are comparable to those of many heterothiometallate clusters. Polymers 1, 2 and 4 show a weak OL effect. The fluorescent spectra in DMF solution (concentration: 1 à 10â4 mol dmâ3) show that polymers 1â4 exhibit different luminescence properties from fcz. The maximum wavelength of polymers 1â3 are blue shifted gradually by 2â12 nm while polymer 4 exhibits a fluorescent self-quenching phenomenon. These results demonstrate that metal ions play an important part in the NLO and fluorescent properties of coordination polymers.
在本文中,我们合成了四种金属有机聚合物[Zn(fcz)Cl2]·CH3OH}n1、[Cd(fcz)2Cl2]·CH3OH·2H2O}n2、[Co(fcz)2Cl2]·2CH3OH}n3和[Cu(fcz)2Cl2]·2CH3OH}n4(fcz = 氟康唑:α-(2,4-二氟苯基)-α-(1H-1,2,4-三唑-1-基甲基)-1H-1,2,4-三唑-1-乙醇),并通过X射线单晶衍射对其进行了表征。聚合物1由沿b轴排列的1维无限链组成。聚合物2–4均表现出2维菱形网格结构。我们使用532 nm激光脉冲(脉冲宽度为8 ns)在DMF溶液中研究了fcz及聚合物1–4的三阶非线性光学特性,发现聚合物1和4与fcz的NLO特性不同,聚合物2和3则与fcz表现出相似的NLO特性。聚合物1具有强的NLO折射效应和较大的NLO吸收行为。聚合物2、3及fcz展现出强折射效应,但它们的NLO吸收行为弱于聚合物1。聚合物4的NLO效应非常弱。使用532 nm激光脉冲(脉冲宽度为40 ps)研究光限制(OL)效应显示,fcz和聚合物3具有强光限制效应。fcz的光限制阈值为0.15 J cm⁻²,聚合物3为0.16 J cm⁻²,均与许多异硫代金属簇的阈值相当。聚合物1、2和4表现出弱光限制效应。在DMF溶液中的荧光光谱(浓度:1 × 10⁻⁴ mol dm⁻³)显示,聚合物1–4展现出与fcz不同的发光特性。聚合物1–3的最大波长逐渐蓝移2–12 nm,而聚合物4显示出荧光自淬灭现象。这些结果表明金属离子在配位聚合物的NLO和荧光特性中发挥着重要作用。