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Assembly of [Tp*WS3Cu2]-Supported Coordination Polymers from Linkers with a Unique mu-Pyridyl Bridging Mode and Their Enhanced Third-Order Nonlinear Optical Performances

机译:[Tp * WS3Cu2]-支持的配位聚合物从具有独特的mu-吡啶基桥联模式的连接子组装而成,并增强了其三阶非线性光学性能

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摘要

We have prepared a family of [WS3Cu2]-based coordination polymers with a rare mu-N type coordination by a simple one-pot assembly of [Et4N] [Tp*WS3] (1) with CuCN in the presence of pyridine (py), 4,4'-bipyridine (bipy), 1,2-bis(4-pyridyl)ethane (bpea), and 2,4,6-tri(4-pyridyl)-1,3,5-triazine (tpt) at room temperature. The resulting coordination polymers [Tp*WS3Cu2(CN)(mu-py)](2)center dot py (2 center dot py), [Tp*WS3Cu2(CN)(2)Cu(mu-py)(2)](2)center dot 3py (3 center dot 3py), [Et4N][{Tp*WS3(CuCN)(2)Cu}(2)(CN)-(mu(4)-bipy)] (4), [Tp*WS3Cu2(CN) (mu(4)-bpea)(0.5)](2)center dot CH2Cl2 (5 center dot CH2Cl2), and [Tp*WS3Cu2(CN)(mu(6)-tpt)(1/3)](2) (6) share a butterfly-shaped [Tp*WS3Cu2] motif with sizable concave to accommodate pyridyl ligands. The approximate mirror symmetry of the motif also induces the orthogonal coalignment of the pyridyl ligands, reinforcing a unique mu-type association with the Cu centers of the cluster skeleton. Such a coordination mode, though scarce in general coordination chemistry, is universal in our series with good ligand tolerance including ligand size and symmetry. In addition, each butterfly-shaped [Tp*WS3Cu2] motif is linked by CN (2), Cu(CN)(2) (3), Cu-2(CN)(5)/mu(4)-bipy (4), CN/mu(4)-bpea (5), and CN/mu(6)-tpt (6) to yield diverse polydimensional structures showing one-dimensional zigzag chains (2 and 3), two-dimensional networks (4 and 5), and a three-dimensional net (6). The third-order nonlinear optical (NLO) property of 2-6 in DMF measured using a Z-scan technique at 532 nm demonstrated that 2-6 have a reverse saturable absorption and self-focusing effects with the hyperpolarizability gamma values in the range of 6.32 X 10(-30) esu to 9.82 X 10(-30) esu. Such values are remarkably larger than that of their precursor complex 1 (1.07 X 10(-32) esu). The results provide an interesting insight into how the mu-type coordination mode of N-donor ligands affects the self-assembly of the [Tp*WS3Cu2]-supported coordination polymers and their structural topologies, as well as their third-order NLO performances.
机译:我们通过在吡啶(py)存在下,通过简单的一锅式组装[Et4N] [Tp * WS3](1)与CuCN,制备了具有罕见的mu-N型配位的基于[WS3Cu2]的配位聚合物家族。 ,4,4'-联吡啶(bipy),1,2-双(4-吡啶基)乙烷(bpea)和2,4,6-三(4-吡啶基)-1,3,5-三嗪(tpt)在室温下。所得配位聚合物[Tp * WS3Cu2(CN)(mu-py)](2)中心点py(2中心点py),[Tp * WS3Cu2(CN)(2)Cu(mu-py)(2)] (2)中心点3py(3个中心点3py),[Et4N] [{Tp * WS3(CuCN)(2)Cu}(2)(CN)-(mu(4)-bipy)](4),[ Tp * WS3Cu2(CN)(mu(4)-豌豆)(0.5)](2)中心点CH2Cl2(5个中心点CH2Cl2)和[Tp * WS3Cu2(CN)(mu(6)-tpt)(1 / 3)] [2](6)共享一个蝴蝶形[Tp * WS3Cu2]图案,该图案带有较大的凹面以容纳吡啶基配体。基序的近似镜像对称性还诱导了吡啶基配体的正交共排列,从而增强了与簇骨架的Cu中心的独特mu型结合。这种配位模式尽管在一般配位化学中很少,但是在我们的系列中是普遍存在的,具有良好的配体耐受性,包括配体尺寸和对称性。此外,每个蝴蝶形[Tp * WS3Cu2]主题都通过CN(2),Cu(CN)(2)(3),Cu-2(CN)(5)/ mu(4)-bipy(4 ),CN / mu(4)-豌豆(5)和CN / mu(6)-tpt(6)来产生显示一维之字形链(2和3),二维网络(4和5)和三维网(6)。使用Z扫描技术在532 nm处测得的DMF中2-6的三阶非线性光学(NLO)特性表明,2-6具有反向饱和吸收和自聚焦效应,超极化率γ值在范围内。 6.32 X 10(-30)esu到9.82 X 10(-30)esu。这样的值明显大于其前体配合物1的值(1.07 X 10(-32)esu)。结果为N供体配体的mu型配位模式如何影响[Tp * WS3Cu2]支撑的配位聚合物的自组装及其结构拓扑以及三阶NLO性能提供了有趣的见解。

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