Modulating the M2δ-to-ligand charge transfer transition by the use of diarylboron substituents
作者:Samantha E. Brown-Xu、Malcolm H. Chisholm、Christopher B. Durr、Thomas F. Spilker、Philip J. Young
DOI:10.1039/c3dt51684a
日期:——
From the reactions between the quadruply bonded complexes M2(TiPB)4, where M = Mo or W and TiPB = 2,4,6-triisopropylbenzoate, and the carboxylic acids HOOCâC6H4â4-B(mesityl)2, LH (2 equivalents) the complexes trans-M2(TiPB)2L2 have been prepared. The new compounds have been characterized by 1H NMR, MALDI-TOF MS, UV-Vis-NIR and steady-state emission spectroscopy, time-resolved transient absorption spectroscopy and cyclic voltammetry. These results are compared with the related properties of the benzoates, M2(TiPB)2(O2CPh)2 (prepared similarly) and with DFT calculations on model compounds where formate substitutes for TiPB. The new compounds M2(TiPB)2L2 are intensely colored in toluene or THF solutions: red (M = Mo) and green (M = W) and the introduction of the p-B(mesityl)2 group notably shifts these metal to ligand charge transfer transitions to lower energy in comparison to the benzoate complexes M2(TiPB)2(O2CâC6H5)2. Upon the addition of fluoride ions these intense absorptions are shifted to much higher energy in a reversible manner for M = Mo.
通过四重键复合物 M2(TiPB)4(其中 M = Mo 或 W,TiPB = 2,4,6-三异丙基苯甲酸酯)与羧酸 HOOC–C6H4–4-B(mesityl)2, LH(2 当量)之间的反应,制备了复合物 trans-M2(TiPB)2L2。这些新化合物通过 1H NMR、MALDI-TOF MS、UV-Vis-NIR 及稳态发射光谱、时间分辨瞬态吸收光谱和循环伏安法进行了表征。将这些结果与类似制备的苯甲酸酯 M2(TiPB)2(O2CPh)2 的相关性质进行比较,并与有关模型化合物的 DFT 计算进行对照,后者中形式酸取代了 TiPB。这些新化合物 M2(TiPB)2L2 在甲苯或 THF 溶液中呈现鲜艳的颜色:红色(M = Mo)和绿色(M = W),引入的 p-B(mesityl)2 取代基显著将这些金属到配体的电荷转移跃迁向较低能量偏移,与苯甲酸酯复合物 M2(TiPB)2(O2C–C6H5)2 相比。当加入氟离子时,这些强吸收在 M = Mo 的情况下以可逆方式向更高能量偏移。
Turning On MLCT Phosphorescence of Iridium(III)–Borane Conjugates upon Fluoride Binding
作者:Ramesh S. Vadavi、Hyungjun Kim、Kang Mun Lee、Taewon Kim、Junseong Lee、Yoon Sup Lee、Min Hyung Lee
DOI:10.1021/om2008937
日期:2012.1.9
auxiliary ligand, and their fluoride adducts were prepared and characterized. While the PL spectra of 2 and 3 exhibit very weak emission in solution, the addition of fluoride turned on (C∧N)2Ir-centered phosphorescence (λem 527 nm for 2 and 617 nm for 3). Experimental and DFT calculations suggest that the weak emission is ascribable to a photoinduced electron transfer from the MLCT state of the (C∧N)2Ir
Sensitizing Tb(III) and Eu(III) Emission with Triarylboron Functionalized 1,3-Diketonato Ligands
作者:Larissa F. Smith、Barry A. Blight、Hee-Jun Park、Suning Wang
DOI:10.1021/ic500944t
日期:2014.8.4
to class I (L1 and L2) and class II (L3 and L4), respectively. In class I, the boron unit is conjugated with the phenyl linker and the diketone backbone, while in class II, the boron unit, the linker unit, and the diketone unit are nonconjugated with a mutually orthogonal arrangement. To understand the impact of the location of the BMes2Ar unit on the electronic properties of the 1,3-diketone molecules
已经研究了四个BMes 2 Ar(Mes =均三基,Ar =苯基或duryl)官能化的1,3-二酮基配体,用于Tb(III)和Eu(III)发射的选择性敏化。这些配体的通式为[R 1 C(O)CR 2 C(O)R 3 ] -(R 1 = Ph,R 2 = H,R 3 = p -Ph-BMes 2,L1; R 1 = R 3 = p -Ph-BMes 2,R 2 = H,L2; R 1 = R 3 = Me,R 2=p -Ph-BMes 2,L 3; n =1。R 1 = R 3 = Me,R 2 = p -duryl-BMes 2,L4,分别属于I类(L1和L2)和II类(L3和L4)。在I类中,硼单元与苯基连接基和二酮主链共轭,而在II类中,硼单元,连接基和二酮单元互不正交。了解BMes位置的影响2合成并研究了有关1,3-二酮分子的电子性质的Ar单元及其激活镧系元素发射的能力,并研究了配体L1
Tuning the through-space charge transfer emission in triarylborane and triarylamine functionalized dipeptide organogels
作者:Yu Wang、Bowen Wang、Kanglei Liu、Xiaodong Yin、Pangkuan Chen、Nan Wang
DOI:10.1039/d1sm01636a
日期:——
Intense through space charge transfer interaction has been observed between the BMes2 and carbazolyl functionalized dipeptide based binary gels.