共查询到18条相似文献,搜索用时 171 毫秒
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《光谱学与光谱分析》2017,(12)
通过系统分析绿色植被在紫外可见波段光谱的产生机理,得出绿峰和红边是由叶绿素产生的。从叶绿素的结构上看,它属于卟啉类化合物,为了进一步探究红边产生的机理,合成了四苯基卟啉、四(4-甲氧基苯基)卟啉、四(4-磺酸钠苯基)卟啉、四吡啶基卟啉、四甲基卟啉、四(4-甲氧基苯基)卟啉合锌和四(4-甲氧基苯基)卟啉合铜,并采用紫外可见光谱、红外及核磁进行表征。通过对其紫外可见光谱的系统分析,提出"红边"不仅限于叶绿素,而是卟啉类化合物特有的光谱特征,红边是由卟啉环a2u(π)-eg(π*)跃迁产生的Q带所致。其位置不仅与卟啉的浓度相关,与卟啉化合物外侧取代基类型也有关系,金属卟啉对红边的位置影响较大。 相似文献
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卟啉及其衍生物具有特殊的光敏、催化等性质,广泛用于分析化学、医药化学、生物化学等各个领域.分别对卟啉、金属卟啉及卟啉类分子器件的紫外-可见光谱的产生机理及光谱特征进行了研究,详细讨论了各类卟啉及其衍生物的紫外-可见光谱的影响因素,重点考察了取代基效应.卟啉及其衍生物紫外-可见光谱的研究在光敏材料选择,新型催化剂开发,痕... 相似文献
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通过卟啉配合物Meso-四(4-羧基苯基)卟啉铜(简称Cu(Ⅱ)-TCPP)中的羧基与γ-氨基丙基三乙氧基硅烷(NH2(CH2)3Si(OC2H5)3,KH550)中的氨基的相互化学作用,成功地把卟啉配合物接枝到KH550中,随着KH550中乙氧基的水解与聚合反应的进行,卟啉铜连接到固体介质中,从而大幅度提高了卟啉在无机固体介质中的掺杂浓度. 将反应产物与γ-(2,3-环氧丙氧基)丙基三甲氧基硅烷(CH2CHCH2O(CH2)3Si(OCH3)3,KH560) 相杂化,形成物化性能良好、连接卟啉的有机-无机复合材料. 用红外光谱表征了Cu(Ⅱ)-TCPP与KH550的化学反应产物,用紫外—可见吸收光谱研究Cu(Ⅱ)-TCPP的分子状态. 应用Z扫描技术研究不同Cu(Ⅱ)-TCPP掺杂浓度的复合材料的非线性光学性质,其三介非线性折射率n2达-1.1161×10-16 m2/W.
关键词:
非线性折射率
有机-无机复合材料
接枝
Meso-四(4-羧基苯基)卟啉铜 相似文献
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在中性磷酸盐缓冲溶液中,以紫外-可见分光光度法和荧光光谱法研究了对称性卟啉[四-(三-甲氧基-四-羟基)苯基]-锌卟啉(简称T(3-MO-4-HP)P-Zn)与α-CD、β-CD、γ-CD三种环糊精之间相互作用形成的超分子体系.结果表明T(3-MO-4HP)P-Zn卟啉与3种环糊精均形成1∶1的包结物.利用双倒数曲线法计算了T(3-MO-4-HP)P-Zn-CD超分子体系的包结常数,结果表明T(3-MO-4-HP)P-Zn与β-CD表现出最强的包结能力. 相似文献
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从光谱上直接观察了单态氧~1.07μm谱带。血卟啉、原卟啉、卟啉C和四氯四碘荧光素钠等含极性基团的光敏剂与非极性的四苯基卟吩在相同的溶剂中所产生的谱带形状有所不同,测量了β-胡萝卜素对单态氧的猝灭常数,与文献在1.27μm测得的数值一致。 相似文献
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自从1934年,Robinowitch观察到了叶绿索的发光性质,Stern等人对卟啉类的电子光谱作了系统研究之后,卟啉类的发光越来越受到人们的重视。如所周知,自然界中广泛存在的叶绿素、人体内的氯化血红素、维生素B12等都具有卟啉的基本骨架结构。鉴于卟啉类化合物在生物化学、药物(特别是抗癌药物)、表面活性剂、催化剂和发光材料等方面的应用价值,近年来该领域的研究仍十分活跃。本工作的目的是测定meso—四苯基卟啉(TPP)、meso—四—(4-N)吡啶基卟啉(TPyP)以其Cu(Ⅱ),Zn(Ⅱ)络合物,在氯仿溶液中的吸收光谱、荧光光踏。也测定了叶绿素-a(Chl-a)、脱镁叶绿素-a(Phn-a)、Cu(Ⅱ)与Zn(Ⅱ)置换的脱镁叶绿素-a(Cu-Phn-a与Zn-Phn-a)在丙酮溶液中的吸收光谱、荧光光谱。同时,测定了这些卟啉类化合物的固体试样的光电压谱。企图通过这种比较研究,寻找光电压谱和吸收光谱、荧光光谱之间的关系,分析过渡金属离子与卟啉环上π电子之间的强相互作用对电子能级的影响。 相似文献
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M. Asha Jhonsi 《Journal of luminescence》2009,129(8):854-860
Certain porphyrin derivatives namely meso-tetraphenylporphyrin (TPP), meso-tetrakis(4-carboxyphenyl)porphyrin (TCPP), meso-tetrakis(4-sulfonatophenyl)porphyrin (TSPP) were examined as sensitizers for colloidal CdS. The interaction of these porphyrins and colloidal CdS were studied by absorption, infrared, steady state and time resolved fluorescence spectroscopy and transient absorption techniques. The apparent association constants (Kapp) resulting from adsorption of porphyrins on CdS surface were calculated from both absorption and fluorescence studies and they agree well. Using all the spectroscopic measurements we confirmed that the interaction between porphyrins and colloidal CdS occurs through ground state complex formation and the quenching follows static mechanism. 相似文献
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The DNA binding and photocleavage specificities of the Zn(II), Cu(II), Co(III), Mn(III) complexes of 5,10,15-tris(1-methylpyridinium-4-yl)-20-(4-propionoxyphenyl)porphyrin have been studied by using a combination of absorption, fluorescence titration, surface-enhanced Raman spectroscopy (SERS), induced circular dichroism (ICD) spectroscopy, thermal DNA denaturation as well as gel electrophoresis experiment. It is found that Cu(II) porphyrin has comparable binding ability with the free base porphyrin while the axial-coordinated Zn(II), Co(III), and Mn(III) porphyrins have lower Kb because of the molecular steric hindrance. However, those metalloporphyrins with lower Kb have similar DNA cleavage efficiencies with the free base porphyrin. This could be best understood by the enhancement of the 1O2 productivity which may also result from the steric hindrance of the axial-coordinated metalloporphyrins. 相似文献
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High-spin ferrous metalloporphyrins FeII(NCH3TPP)Cl, FeII(NCH3TPP)Br, FeII(NCH3TPP)ClO4, and FeII(NCH3OEP)Cl(NCH3TPP-N-methyltetraphenylporphyrin, NCH3OEP-N-methyloctaethylporphyrin) have been characterized by Mössbauer spectroscopy. Values ofIS (0.8 mm/s versus α-Fe) typical for high-spin ferrous porphyrin and very large quadrupole splittings (?4 mm/s) have been observed. Iron(II) N-methylporphyrins should be readily detected in proteins by means of Mössbauer spectroscopy. Such parameters are similar to those of symmetrical anionic five coordinate high-spin porphyrins [FeII(TPP)X]? (X-halide). 相似文献
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本工作对无长链天然血卟啉(HP),原叶啉(PP)和卟啉C行进了LB膜的成膜探索,制备了单层、多层以及与硬脂酸、卵磷脂混合后的复合LB膜.对它们进行了紫外——可见吸收光谱、荧光光谱和时间分辨荧光光谱的研究,发现在LB膜中荧光寿命是一个很好的表征手段. 相似文献
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铜胁迫下玉米叶片反射光谱的红边位置变化及其与叶绿素的关系 总被引:1,自引:0,他引:1
采用5级梯度铜胁迫砂培试验,通过测定叶片反射光谱曲线和叶绿素含量,研究铜胁迫对玉米叶片反射光谱与叶绿素含量的影响。研究表明:玉米叶片反射光谱的红边位置与铜胁迫浓度显著相关(R2≥0.5755),且存在明显的“红边蓝移”现象,即叶片光谱红边位置向短波方向移动。随着铜胁迫浓度的升高或胁迫时间延长,红边蓝移程度增加。不同胁迫浓度之间,叶绿素a、叶绿素b含量及二者比值 (Chla/Chlb)均差异显著(p分别为0.002,0.007和0.001)。叶绿素a、b比值(Chla/Chlb)与培养液中铜浓度呈显著负相关(R=-0.898);Chla/Chlb与平均红边波长显著正相关(R=0.814)。这表明随着铜胁迫浓度升高,Chla/Chlb降低,叶绿素b相对于叶绿素a升高,叶片反射光谱的红边位置蓝移。铜胁迫改变了玉米叶片中Chla和Chlb含量和比值,由此导致的色素吸收光谱变化,是铜胁迫导致叶片反射光谱红边蓝移的可能的生理学成因。 相似文献
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The properties of meso-tetraphenylporphine (TPP) aggregates formed in acidic aqueous-organic solutions are investigated by UV-vis spectroscopy. According to the absorption spectra, the Q band absorption of the aggregated TPP shows red shift and intensity enhancement, and a model that includes the participation of water molecules in a porphyrin aggregation complex is proposed, then a qualitative explanation based on Gouterman's excition coupling theory is presented. Calculations including eigenenergies, eigenstates and the transition dipole strength of the coupled states are carried out. 相似文献