Cross-couplings in the elaboration of luminescent bis-terpyridyl iridium complexes: the effect of extended or inhibited conjugation on emission
作者:Wendy Leslie、Andrei S. Batsanov、Judith A. K. Howard、J. A. Gareth Williams
DOI:10.1039/b313638h
日期:——
The utility of Suzuki cross-coupling methodology for the in situ elaboration of bromo-functionalised bis-terpyridyl iridium(III) complexes has been explored. The complex [Ir(tpy)(tpy-ϕ-Br)]3+ tpy-ϕ-Br = 4′-(4-bromophenyl)-2,2′:6′,2″-terpyridine} undergoes palladium-catalysed cross-coupling with aryl boronic acids to yield biaryl-substituted complexes directly. The biphenyl and 4-cyanobiphenyl-substituted products display relatively intense, long-lived (τ > 100 µs) yellow emission in degassed aqueous solution at room temperature, assigned to a 3π–π* state. A 4-aminobiphenyl-substituted analogue displays an additional low energy absorbance band, attributed to an intraligand charge-transfer (ILCT) excited state, and is scarcely emissive under the same conditions. The iridium(III) complex of 4′-mesityl-terpyridine is also reported. Its emission is much shorter-lived, with a spectral profile resembling that of unsubstituted [Ir(tpy)2]3+, confirming the need for the attainment of a roughly coplanar geometry for stabilisation of the 3π–π* excited state.
Chromium(III) Bis-Arylterpyridyl Complexes with Enhanced Visible Absorption via Incorporation of Intraligand Charge-Transfer Transitions
作者:Johanna C. Barbour、Amy J. I. Kim、Elsemarie deVries、Sarah E. Shaner、Benjamin M. Lovaasen
DOI:10.1021/acs.inorgchem.7b00953
日期:2017.7.17
A series of chromium(III) bis-arylterpyridyl complexes containing intraligand charge-transfer (ILCT) excited states were prepared and characterized. These complexes show significant absorption in the visible region due to the ILCT bands. The ILCT bands are tunable across the UV and visible spectrum via incorporation of electron-withdrawing and electron-donating groups on the aryl ring. The absorption
制备并表征了一系列含配体内电荷转移(ILCT)激发态的三价铬(Ⅲ)双-芳基吡啶基配合物。由于ILCT带,这些复合物在可见光区显示出明显的吸收。通过在芳基环上引入吸电子和供电子基团,ILCT谱带可在紫外和可见光谱范围内调节。的Cr的(4' - (4-吸收-甲氧基苯基)-2,2':6',2“ -三联吡啶)2 3+(4尤其)是在可见光区(ε= 11 900米强得多-1厘米-1在450nm和ε= 5090中号-1厘米-1在500nm)比亲复合铬(TPY的)2 3+(tpy = 2,2':6',2”-吡啶;在450 nm处ε= 2160 M –1 cm –1,在500 nm处ε= 170 M –1 cm –1)。在该系列上的发射实验表明,激发到ILCT谱带后,基于Cr(III)的磷光的寿命为140到600 ns,这表明激发能从配体局部激发态到Cr(III)激发态的漏斗。循环伏安图显示至少三个可逆的基
General Synthesis of Di-μ-oxo Dimanganese Complexes as Functional Models for the Oxygen Evolving Complex of Photosystem II
作者:Hongyu Chen、Ranitendranath Tagore、Siddhartha Das、Christopher Incarvito、J. W. Faller、Robert H. Crabtree、Gary W. Brudvig
DOI:10.1021/ic0509940
日期:2005.10.1
water, is a functional model for the oxygen-evolving complex of photosystem II (Limburg, et al. J. Am. Chem. Soc. 2001, 123, 423-430). Crystals of Mn(II)(dpya)Cl2, Mn(II)(Ph-terpy)Cl2, Mn(II)(mesityl-terpy)Cl2, and an organic-soluble di-mu-oxo di-aqua dimanganesecomplex, [Mn(III/)(IV)2(mu-O)2(mesityl-terpy)2(OH2)2](NO3)3, were obtained and characterized by X-ray crystallography. Solutions of the in situ-formed
Polymer encapsulated particles as surface enhanced Raman scattering probes
申请人:Chen Hongyu
公开号:US10724903B2
公开(公告)日:2020-07-28
The present invention refers to a Raman active composite material comprising a metal particle; a coating layer of a Raman active molecule bound to the metal particle; and an encapsulating layer of an amphiphilic polymer bound to the metal particle. The present invention also refers to methods of manufacturing a Raman active composite material described herein and their uses.
POLYMER ENCAPSULATED PARTICLES AS SURFACE ENHANCED RAMAN SCATTERING PROBES
申请人:Chen Hongyu
公开号:US20110151586A1
公开(公告)日:2011-06-23
The present invention refers to a Raman active composite material comprising a metal particle; a coating layer of a Raman active molecule bound to the metal particle; and an encapsulating layer of an amphiphilic polymer bound to the metal particle. The present invention also refers to methods of manufacturing a Raman active composite material described herein and their uses.