Synthesis and structures of cyclic gold complexes containing diphosphine ligands and luminescent properties of the high nuclearity species
作者:Suresh Bhargava、Kunihiko Kitadai、Takahashi Masashi、Daniel W. Drumm、Salvy P. Russo、Vivian Wing-Wah Yam、Terence Kwok-Ming Lee、Jörg Wagler、Nedaossadat Mirzadeh
DOI:10.1039/c2dt11722c
日期:——
A mixture of cyclic gold(I) complexes [Au2(μ-cis-dppen)2]X2 (X = OTf 1, PF63) and [Au(cis-dppen)2]X (X = OTf 2, PF64) is obtained from the reaction of [Au(tht)2]X (tht = tetrahydrothiophene) with one equivalent of cis-dppen [dppen = 1,2-bis(diphenylphosphino)ethylene]. The analogous reaction with trans-dppen or dppa [dppa = bis(diphenylphosphino)acetylene] affords the cyclic trinuclear [Au3(μ-trans-dppen)3]X3 (X = OTf 11, PF612) and tetranuclear [Au4(μ-dppa)4]X4 (X = OTf 13, PF614, ClO415) gold complexes, respectively. Recrystallization of 15 from CH2Cl2/MeOH yielded a crystal of the octanuclear gold cluster [Au8Cl2(μ-dppa)4](ClO4)216. Attempts to prepare dicationic binuclear gold(II) species from the reaction of a mixture of 3 and 4 with halogens gave a mixture of products, the components of which confirmed to be acyclic binuclear gold(I) [Au2X2(cis-dppen)] (X = I 5, Br 7) and cyclic mononuclear gold(III) [AuX2(cis-dppen)]PF6 (X = I 6, Br 8) complexes. Complexes 11–14 reveal weak emission in butyronitrile glass at 77 K, but they are non-emissive at room temperature. Ab initio modelling was performed to determine the charge state of the gold atoms involved. Extensive structural comparisons were made to experimental data to benchmark these calculations and rationalize the conformations.
[Au2(μ-顺式-dppen)2]X2(X = OTf 1,PF63)和[Au(顺式-dppen)2]X(X = OTf 2,PF64)的环状金(I)配合物混合物是由[Au(tht)2]X(tht = 四氢噻吩)与一当量的顺式-dppen [dppen = 1,2-双(二苯基膦)乙烯]反应得到的。与反式-dppen 或 dppa [dppa = 双(二苯基膦)乙炔] 进行类似反应,可分别得到环状三核 [Au3(μ-反式-dppen)3]X3(X = OTf 11,PF612)和四核 [Au4(μ-dppa)4]X4(X = OTf 13,PF614,ClO415)金配合物。从 CH2Cl2/MeOH 中重结晶 15 得到了八核金簇合物 [Au8Cl2(μ-dppa)4](ClO4)216。尝试从 3 和 4 的混合物与卤素的反应中制备二阳离子双核金 (II) 物种,得到了混合物产物,其中的成分被证实为非环双核金 (I) [Au2X2(cis-dppen)] (X = I 5, Br 7) 和环单核金 (III) [AuX2(cis-dppen)]PF6 (X = I 6, Br 8) 配合物。络合物 11-14 在 77 K 的丁腈玻璃中显示出微弱的发射,但在室温下则无发射。为了确定相关金原子的电荷状态,我们进行了 Ab initio 建模。与实验数据进行了广泛的结构比较,以便为这些计算提供基准并使构象合理化。