一系列Ru(II)配合物电致化学发光性质的比较研究

比较研究了以C₂O₄^2－为共反应物时5个结构相关的Ru(II)配合物[Ru(bpy)₂L¹]^2＋, [Ru(bpy)₂L²]^2＋, [Ru(bpy)₂L³]^2＋, [Ru(phen)₂L¹]^2＋和[Ru(phen)₂L²]^2＋(其中bpy＝2,2′-联吡啶, phen＝1,10-邻菲啰啉, L¹＝4-羧基苯基咪唑[4,5-f][1,10]邻菲啰啉, L²＝3-羧基-4-羟基苯基咪唑[4,5-f][1,10]邻菲啰啉, L³＝3,4-二羟基苯基咪唑[4,5-f][1,10]邻菲啰啉)的电致化学发光(ECL)性质. 结果表明, 酚羟基的存在能有效地淬灭Ru(II)配合物[Ru(bpy)₂L²]^2＋, [Ru(bpy)₂L³]^2＋和[Ru(phen)₂L²]^2＋的ECL, 其它Ru(II)配合物的ECL量子效率与[Ru(bpy)₃]^2＋相差不大.     

不对称三邻菲咯啉钌(Ⅱ)配合物的合成、电化学和荧光光谱(Ⅱ)

设计并合成了一种新化合物5-(3-溴丙酰)胺-1,10-邻菲咯啉,phen-NHCOCH2CH2Br(a),和一种新型电化学发光(ECL)传感器活性材料Ru(phen)2[phen-NHCOCH2CH2Br](PE6)2(b),利用元素分析、红外光谱、核磁共振氢谱和激光解析电离飞行时间质谱确证了其组成和结构.同时,还研究了化合物b的荧光光谱和电化学行为.     

具不同官能团钌(Ⅱ)邻菲啰啉配合物氧淬灭性能的比较研究

设计并制备具不同官能团的钌(Ⅱ)邻菲啰啉配合物——[Ru(bpy)2(phen-NO2)](PF6)2(1),[Ru(bpy)2(phen-Br)](PF6)2(2),[Ru(bpy)2(phen-NH2)](PF6)2(3),[Ru(bpy)2(bphen)](PF6)2(4),其中,bpy为2,2’-联吡啶,phen-NO2为5-硝基-邻菲啰啉,phen-Br为5-溴-1,10-菲啰啉,phen-NH2为5-氨基-邻菲啰啉,bphen为4,7-二苯基-邻菲啰啉.借助核磁共振(NMR)、红外光谱(FTIR)、元素分析、紫外可见光谱(UV-vis)和荧光光谱法对其进行了分析与表征.结果表明:配合物2～4在蓝-紫色可见光区域有较强吸收、可发射出明亮的橙红色荧光、具荧光量子效率(Φ)高、激发态寿命(τ)长、Stocks位移值较大(147～180 nm)和优良的氧致荧光淬灭性能(Ksv≥3.5,(I0/I)max≥4.0)等光物理性质.其中,具接枝型官能团氨基的配合物3的量子效率(Φ)=10%,τ=381.8 ns,Ksv=3.49,(I0/I)max=4.33;而溴修饰的配合物2以高达18%的荧光量子效率、634.7 ns的激发态寿命、180 nm的Stocks位移和Ksv=4.59,氧淬灭参数(I0/I)max=5.29,使之最有希望成为接枝型、较高性能的光学氧传感器的候选氧敏指示剂.     

系列含4,5-二氮杂-9,9′-螺二芴配体的钌配合物的合成及其性能研究(英文)

合成了3个钌髤配合物,[Ru(bpy)2(SB)](PF6)2、[Ru(bpy)(SB)2](PF6)2和[Ru(SB)3](PF6)2(bpy=2,2′-bipyridine,SB=4,5-diaza-9,9′-spirobifluorene),通过核磁和元素分析对配合物的结构进行了确定。[Ru(bpy)2(SB)](PF6)2通过X射线单晶衍射确认了结构。研究了配合物的光物理性能。结果表明[Ru(bpy)2(SB)](PF6)2在乙腈中的发桔红光,波长为606 nm,量子产率约为0.001 2。在同样条件下[Ru(bpy)(SB)2](PF6)2和[Ru(SB)3](PF6)2的发光非常微弱甚至几乎没有发光。还研究了这些配合物的电致化学发光性能。随着配体中SB含量的增加,发光的峰电压从1.36 V增加到1.58 V,相对发光强度从731降低到52。     

邻菲啰啉钌(Ⅱ)配合物的结构及电致发光性能的研究

合成了三-(1,10-邻菲啰啉)钌发光配合物Ru(phen)3(PF6)2(phen=1,10-邻菲啰啉),得到了其单晶结构.单晶结构分析结果表明,Ru(phen)3(PF6)2具有层状结构特征,阳离子[Ru(phen)3]2+和阴离子PF-6分别构成了正电荷层和负电荷层,正、负电荷层交替排列形成了晶体结构.分别以Ru(phen)3Cl2和Ru(phen)3(PF6)2制备了单层结构的电化学发光器件(LECs),器件结构为[ITO/Ru(Ⅱ)-配合物(100 nm)/Al(200 nm)].结果显示:以Ru(phen)3(PF6)2为发光层的器件显示的最高效率和亮度分别为0.24 cd/A和1 829 cd/m2,而以Ru(phen)3Cl2为发光层的器件显示的最高效率和亮度分别为0.18 cd/A和350 cd/m2,表明Ru(phen)3(PF6)2比Ru(phen)3Cl2具有更优异的电致发光性能.     

DFT法研究阴离子识别剂[Ru（bpy）2L]2+（L=H2biim,H2bbim）去质子后结构变化

配合物[Ru(bpy)2(H2biim)](PF6)2(1)(bpy=2,2′-联吡啶,H2biim=2,2′-联咪唑)和[Ru(bpy)2(H2bbim)](PF6)2(4)(H2bbim=2,2′-苯并联咪唑)是良好的阴离子识别剂.用密度泛函理论方法研究了2种阴离子识别剂脱去质子后的几何结构和电子结构的变化.计算结果表明:脱去质子后配合物HOMO轨道上电子云分布由中心钌原子转移到(苯并)联咪唑上,而LUMO轨道虽然能量增加但电子云仍然分布在bpy配体上;另外,最高占居轨道HOMO与最低空轨道LUMO的能量差ΔεL-H逐渐减小,相对于配合物的吸收波长增大,所以分子的吸收峰发生红移,这与实验现象相吻合。     

叠氮二(2,2′-联吡啶)钌(Ⅱ)配合物的光物理和光化学性质

本文研究了叠氮二(2,2′—联吡啶)钌(Ⅱ)配合物在有机溶剂及乙腈—水中的一些光物理和光化学性质。在77K的甲醇—乙醇玻璃态时,用245nm等波长激发表现较强的荧光,其最大发射峰在540nm,另一弱带在580nm。在室温甲醇中测得的磷光发射是弱的,且寿命<15us。 在254nm、300nm及514nm照射下,光反应机制及量子产率与溶剂、照射波长有关。在乙腈—水及乙腈中,分别用254nm和514nm照射均发生取代反应,最后的光产物为Ru(bpy)_2(N_3)(CH_3CN)~ ,配合物消失的量子产率分别为0.129±0.008mol einstein~(-1)及(6.77±0.22)×10~(-5)mol einstein~(-1);在乙腈—水中用514nm照射,生成的光产物先是Ru(bpy)_2(N_3)(CH_3CN)~ ,再生成Ru(bpy)_2(CH_3CN)_2~(2 ),配合物消失的量子产率为(5.32±0.13)×10~(-4)mol einstein~(-1)。     

六氟磷酸二(2,2’-联吡啶)(2,2’-联吡啶-4,4’-二羧酸)合钌(Ⅱ)的二维核磁共振谱分析

利用核磁共振氢谱和碳谱研究了电化学探针六氟磷酸二(2,2＇-联吡啶)(2,2＇-联吡啶-4,4’-二羧酸)合钌(Ⅱ)的立体结构,并通过二维~1H~1同核相关及~1H-~(13)C异核相关技术对其氢谱和碳谱进行了归属.     

六氟磷酸二(2,2′-联吡啶)(2,2′-联吡啶-4,4′-二羧酸)合钌(Ⅱ)的二维核磁共振谱分析

利用核磁共振氢谱和碳谱研究了电化学探针六氟磷酸二(2,2′-联吡啶)(2,2′-联吡啶-4,4'-二羧酸)合钌(Ⅱ)的立体结构,并通过二维1H-1H同核相关及1H-13C异核相关技术对其氢谱和碳谱进行了归属.     

一种新型联吡啶钌配合物的电致化学发光性能

合成了一种多联吡啶钌配合物(bpy)2Ru(phenCl4)(PF6)2,bpy为2,2′-联吡啶,phenCl4为3,4,7,8-四氯-1,10-邻菲罗啉,并用元素分析、红外光谱、核磁共振谱测试技术对结构进行了表征. 化合物在紫外和可见光区均有吸收,在可见光区的最大吸收波长为440 nm,这是典型的金属到配体(MLCT)的跃迁,其光致发光性能也显示出MLCT迁移特征,并且随溶剂不同,其最大发射波长从630 nm变化至649 nm. 配合物的电致化学发光性能受pH值影响不大,与随pH值增大电致化学发光强度增大的联吡啶钌不同,尤其在强碱条件下,其背景电致化学发光很小.     

配合物Ru(dcbpy)(phen)2(PF6)2的2D-NMR分析

用一维ＮＭＲ方法研究了新型电化学发光探针Ｒｕ（ｄｃｂｐｙ）（ｐｈｅｎ）２（ＰＦ６）２的立体结构,借助二维＾１Ｈ－＾１Ｈ ＣＯＳＹ和＾１Ｈ－＾１３Ｃ ＣＯＳＹ实验对其氢谱和碳谱进行了完全的归属,并给出了其氢谱和碳谱的化学位移值。     

Synthesis and Properties of Ru(phen)_2(phen-NHCOCH_2Br)(PF_6)_2

Recently.anelectrochemiluminescent(ECL)Ptelectrodecoated\vithaRtl(bp})::derivativemoditiedchitosan/silicagelnlelllbralledevelopedbyZhaoalu/'.hasbeedsuccesstlill}appliedinselectivedetectionofoxalicacid.Yangel'I/.-.havediscoveredthatECLetficiencyofRu(phen),='ismuchhigherthanthatofRu(bp}i);=.Thus.wedesignedandsynthesizedanewactivematerialforECLsensor*Ru(phen)=(phenNHCH,Br)(PF,)=.andthesyntheticrouteisshowninFigure1.Figure1.SchemeI\)rs}nthcticrouteofRu(phcn)2(phCll-NIICIl:Br)(I'I:,)2…     

Spectroelectrochemical studies on mixed-valence states in a cyanide-bridged molecular square, [Ru(II)(2)Fe(II)(2)(mu-CN)(4)(bpy)(8)](PF6)(4).CHCl(3).H(2)O

A cyanide-bridged molecular square of [Ru(II) (2)Fe(II) (2)(mu-CN)(4)(bpy)(8)](PF(6))(4).CHCl(3).H(2)O, abbreviated as [Ru(II) (2)Fe(II) (2)](PF(6))(4), has been synthesised and electrochemically generated mixed-valence states have been studied by spectroelectrochemical methods. The complex cation of [Ru(II) (2)Fe(II) (2)](4+) is nearly a square and is composed of alternate Ru(II) and Fe(II) ions bridged by four cyanide ions. The cyclic voltammogram (CV) of [Ru(II) (2)Fe(II) (2)](PF(6))(4) in acetonitrile showed four quasireversible waves at 0.69, 0.94, 1.42 and 1.70 V (vs. SSCE), which correspond to the four one-electron redox processes of [Ru(II) (2)Fe(II) (2)](4+) right arrow over left arrow [Ru(II) (2)Fe(II)Fe(III)] (5+) right arrow over left arrow [Ru(II) (2)Fe(III) (2)](6+) right arrow over left arrow [Ru(II)Ru(III)Fe(III) (2)](7+) right arrow over left arrow [Ru(III) (2)Fe(III) (2)](8+). Electrochemically generated [Ru(II) (2)Fe(II)Fe(III)](5+) and [Ru(II) (2)Fe(III) (2)](6+) showed new absorption bands at 2350 nm (epsilon =5500 M(-1) cm(-1)) and 1560 nm (epsilon =10 500 M(-1) cm(-1)), respectively, which were assigned to the intramolecular IT (intervalence transfer) bands from Fe(II) to Fe(III) and from Ru(II) to Fe(III) ions, respectively. The electronic interaction matrix elements (H(AB)) and the degrees of electronic delocalisation (alpha(2)) were estimated to be 1090 cm(-1) and 0.065 for the [Ru(II) (2)Fe(II)Fe(III) (2)](5+) state and 1990 cm(-1) and 0.065 for the [Ru(II) (2)Fe(III) (2)](6+) states.     

Chemiluminescence determination of barbituric acid using Ru(phen)(3)(2+)-Ce(IV) system

A chemiluminescence (CL) method for the determination of barbituric acid (BA) was proposed, which is based on the enhancement of BA to the CL intensity of Tris-(1,10-phenanthroline)ruthenium(II) (Ru(phen)₃²⁺)-cerium(IV) (Ce(IV)) system. The concentration of BA is proportional to the CL intensity in the range of 5.0×10⁻³-2.0 μg ml⁻¹. The detection limit is 6.9×10⁻⁴ μg ml⁻¹. The relative standard deviation (R.S.D.) of determining 11 samples containing 0.20 μg ml⁻¹ BA is 3.2%. This CL method has been successfully applied to the determination of BA in the synthetic samples. The mechanism of CL reaction was studied.     

Crystallographic report: A synthetic precursor for hetero‐binuclear metal complexes, [Ru(bpy)(dppy)2(CO)2](PF6)2 (bpy = 2,2′‐bipyridine,dppy = 2‐(diphenylphosphino)pyridine)

In the title complex, [Ru(bpy)(dppy)₂(CO)₂](PF₆)₂ (bpy = 2,2′‐bipyridine, dppy = 2‐(diphenylphosphino)pyridine), the ruthenium atom exhibits a slightly distorted octahedral coordination with the carbonyl ligands in cis positions. In addition, two dppy ligands coordinate to the ruthenium center through the phosphorus atoms in mutually trans positions and two pyridyl nitrogen atoms of the dppy direct toward two carbonyl ligands. Copyright © 2004 John Wiley & Sons, Ltd.     

Synthesis, characterization, and reactivity of [Ru(bpy)(CH3CN)3(NO2)]PF6, a synthon for [Ru(bpy)(L3)NO2] complexes

We report a high yield, two-step synthesis of fac-[Ru(bpy)(CH3CN)3NO2]PF6 from the known complex [(p-cym)Ru(bpy)Cl]PF6 (p-cym = eta(6)-p-cymene). [(p-cym)Ru(bpy)NO2]PF6 is prepared by reacting [(p-cymene)Ru(bpy)Cl]PF6 with AgNO3/KNO2 or AgNO2. The 15NO2 analogue is prepared using K15NO2. Displacement of p-cymene from [(p-cym)Ru(bpy)NO2]PF6 by acetonitrile gives [Ru(bpy)(CH3CN)3NO2]PF6. The new complexes [(p-cym)Ru(bpy)NO2]PF6 and fac-[Ru(bpy)(CH3CN)3NO2]PF6 have been fully characterized by 1H and 15N NMR, IR, elemental analysis, and single-crystal structure determination. Reaction of [Ru(bpy)(CH3CN)3NO2]PF6 with the appropriate ligands gives the new complexes [Ru(bpy)(Tp)NO2] (Tp = HB(pz)3-, pz = 1-pyrazolyl), [Ru(bpy)(Tpm)NO2]PF6 (Tpm = HC(pz)3), and the previously prepared [Ru(bpy)(trpy)NO2]PF6 (trpy = 2,2',6',2' '-terpyridine). Reaction of the nitro complexes with HPF6 gives the new nitrosyl complexes [Ru(bpy)TpNO][PF6]2 and [Ru(bpy)(Tpm)NO][PF6]3. All complexes were prepared with 15N-labeled nitro or nitrosyl groups. The nitro and nitrosyl complexes were characterized by 1H and 15N NMR and IR spectroscopy, elemental analysis, cyclic voltammetry, and single-crystal structure determination for [Ru(bpy)TpNO][PF6]2. For the nitro complexes, a linear correlation is observed between the nitro 15N NMR chemical shift and 1/nu(asym), where nu(asym) is the asymmetric stretching frequency of the nitro group.     

Intermolecular interactions of extended aromatic ligands: the synchrotron molecular structures of [Ru(bpy)2(N-HSB)].2PF6 and [Ru(bpy)2(N-(1/2)HSB)].2PF6

An off-set stack and a saddle-like distortion are revealed by the molecular structures of [Ru(bpy)2(N-HSB)].2PF6 and [Ru(bpy)2(N-(1/2)HSB)].2PF6.     

Enantiospecific synthesis of delta and lambda [Ru(bpy)(2)ppy](+) and [Ru(bpy)(2)quo](+) (bpy = 2,2'-bipyridine,ppy = phenylpyridine-H(+), quo = 8-hydroxyquinolate): (1)H and (13)C NMR studies and X-ray structure determination of rac-[Ru(bpy)(2)quo]PF(6)

In this paper, we describe the enantiospecific synthesis and the complete characterization of the two hexacoordinated ruthenium(II) monocations [Ru(bpy)(2)ppy](+) and [Ru(bpy)(2)quo](+) (bpy = 2,2'-bipyridine, ppy = phenylpyridine-H(+), quo = 8-hydroxyquinolate) in their enantiomeric Delta and Lambda forms. The corresponding enantiomeric excesses (ee's) are determined by (1)H NMR using pure Delta-Trisphat (tris(tetrachlorobenzenedialato)phosphate(V) anion) as a chiral (1)H NMR shift reagent. A complete (1)H and (13)C NMR study has been carried out on rac-[Ru(bpy)(2)ppy]PF(6) and rac-[Ru(bpy)(2)quo]PF(6). Additionally, the X-ray molecular structure of rac-[Ru(bpy)(2)quo]PF(6) is reported; this latter species crystallizes in the monoclinic C2/c space group (a = 22.079 A, b = 16.874 A, c = 17.533 A, alpha = 90 degrees, beta = 109.08 degrees, gamma = 90 degrees ).     

Synthesis, Electrochemistry, Fluorescence and ECL of Ru (phen)_2 (dcbpy) (PF_6)_2

HighlyluminescentRu(II).Os(II)andRe(l)metalcomplexesareapromisingclassofelectrochemiluminescent(ECL)materials'.WehavedesignedandsynthesizedRu(phen)=(dcbpy)(PF,)=Thesyntheticrouteisshownasfollows,4,4-dicarboxylicacid-2,2-bipyridine(dcbpy)wassynthesize...