Formation of dimeric and polymeric W/Cu/S clusters via degradation or expansion of the cluster core in [Et4N]4[WS4Cu4I6]
作者:Yu-Jian Huang、Ying-Lin Song、Yang Chen、Hong-Xi Li、Yong Zhang、Jian-Ping Lang
DOI:10.1039/b816312j
日期:——
The reactions of a precursor cluster [Et4N]4[WS4Cu4I6] (1) with two equiv. of 1,1′-(1,4-butanediyl)bis(3,5-dimethyl-pyrazole) (bbd) or 1,3,5-tris(3,5-dimethyl-pyrazolyl-1-ylmethyl)-2,4,6-trimethylbenzene (tdtb) in MeCN/DMF afforded the dimeric clusters [WS4Cu3I(μ-bbd)]2 (2) and [WS4Cu3(tdtb)}2(μ-I)2]·2DMF (3·2DMF), respectively. Solvothermal reactions of 1 with two equiv. of bbd in MeCN/DMF at 90 °C for 24 h resulted in the formation of the dimeric cluster [Et4 N]6[WS4Cu5(μ-I)2I4}2(μ-bbd)] (4) while those of 1 with two equiv. of 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene (titb) in DMF at 120 °C afforded the polymeric cluster [WS4Cu2(titb)]·0.5H2O}n (5). Compounds 2–5 were characterized by elemental analysis, IR, UV-vis, 1H NMR and single-crystal X-ray crystallography. Compound 2 has a double nido-shaped structure in which two nido-shaped [WS4Cu3] cores are connected by a pair of bbd ligands while 3 has a double butterfly-shaped structure in which two [WS4Cu3(tdtb)] fragments are linked by two bridging iodides. Compound 4 has a double-double half-open cubane-like structure in which a couple of double half-open cubane-like [WS4Cu5] cores are bridged by one bbd ligand. Compound 5 has a unique two-fold interpenetrated 3D (102·12)core(102·12)titb network in which each linear [WS4Cu2] core acts as a T-shaped 3-connecting node and each titb ligand works as a trigonal pyramidal 3-connecting node. The core structures of 2–5 are different from the saddle-shaped [WS4Cu4] core of 1, which may be attributed to the degradation or expansion of the cluster core of 1 during the reactions. In addition, the third-order non-linear optical (NLO) properties of 1–4 in DMF were also investigated by using Z-scan techniques at 532 nm.
前体簇 [Et4N]4[WS4Cu4I6] (1) 与两个当量的反应。 1,1'-(1,4-丁二基)双(3,5-二甲基-吡唑)(bbd)或1,3,5-三(3,5-二甲基-吡唑基-1-基甲基)-2, MeCN/DMF 中的 4,6-三甲苯 (tdtb) 提供二聚簇 [WS4Cu3I(μ-bbd)]2 (2) 和 [WS4Cu3(tdtb)}2(μ-I)2]·2DMF (3·2DMF) ), 分别。 1 与 2 当量的溶剂热反应。 bbd 在 MeCN/DMF 中于 90 °C 反应 24 小时,导致形成二聚簇 [Et4 N]6[WS4Cu5(μ-I)2I4}2(μ-bbd)] (4),而 1两个当量。 1,3,5-三(咪唑-1-基甲基)-2,4,6-三甲苯(titb)在DMF中在120℃下得到聚合物簇[WS4Cu2(titb)]·0.5H2O}n(5 )。通过元素分析、IR、UV-vis、1H NMR 和单晶 X 射线晶体学对化合物 2-5 进行了表征。化合物2具有双巢状结构,其中两个巢状[WS4Cu3]核通过一对bbd配体连接,而化合物3具有双蝴蝶状结构,其中两个[WS4Cu3(tdtb)]片段通过两个配体连接桥接碘化物。化合物 4 具有双双半开立方烷状结构,其中一对双半开立方烷状 [WS4Cu5] 核通过一个 bbd 配体桥接。化合物5具有独特的双重互穿3D(102·12)核心(102·12)titb网络,其中每个线性[WS4Cu2]核心充当T形3连接节点,每个titb配体充当三角锥体3-连接节点。 2-5的核心结构与1的鞍形[WS4Cu4]核心不同,这可能归因于1的簇核在反应过程中的降解或膨胀。此外,还通过使用 532 nm 的 Z 扫描技术研究了 1-4 在 DMF 中的三阶非线性光学 (NLO) 性质。