对甲氧在偶氮苯衍生物的核磁共振表征

用一维＾Ｈ ＮＭＲ、＾１３Ｃ ＮＭＲ方法研究了对甲氧基偶氮苯衍生物的结构,并通过二维＾１Ｈ－＾１Ｈ同核相关谱（ＣＯＳＹ）、＾１３Ｃ－＾１Ｈ异核相关谱（ＨＥＴＣＯＲ）及＾１３Ｃ－＾１Ｈ异核远程相关谱进一步地确定了该类衍生物的＾１Ｈ和＾１３Ｃ谱中各谱峰的归属,为研究侧链液晶聚合物结构提供了有价值的数据。     

含穴醚N8O3配体的金属大环化合物的NMR研究

在溶液中,室温下对含有穴醚Ｎ８Ｏ３配体（Ｈ３Ｌ）的金属大环化合物［Ｎａ（Ｈ３Ｌ）］（ＣｌＯ４）３Ｈ２Ｏ（２）和［Ｌａ（Ｈ３Ｌ）（ＯＨ）２］（ＣｌＯ４）３（３）,作了１ＨＮＭＲ谱的测定,在化合物（２）－乙腈溶液中加入过量Ｌａ（ＣｌＯ４）３后的（２＋Ｌａ）和化合物（３）还作了１３Ｃ和１Ｈ－１ＨＣＯＳＹ（氢－氢相关二维谱）、１Ｈ－１３ＣＨＭＱＣ（氢核检测的异核多量子相干相关谱）及１Ｈ－１３ＣＨＭＢＣ（氢核检测的异核多键相关谱）的ＮＭＲ谱测定,归属了所有１Ｈ,１３Ｃ的谱线。对其配位行为通过１ＨＮＭＲ试验作了简单的讨论。     

核磁共振方法表征2,2''''-二(对羧酸苯氧基)-1,1''''联萘

利用１Ｈ ＮＭＲ，１３Ｃ ＮＭＲ研究了 ２，２’－二（对羧酸苯氧基）－１，１’－联萘结构，并通过１Ｈ－１Ｈ ＣＯＳＹ及１３Ｃ－１Ｈ异核相关谱进一步确定了其１Ｈ谱和１３Ｃ谱中各谱峰的归属，为同类化合物的表征提供了一个依据。     

酞侧基聚芳醚砜的核磁共振研究──PES－C的氢谱归属及碳谱峰的确认

用１３Ｃ－ＮＭＲ谱和二维异核化学位移相关谱（ＨＥＴＣＯＲ）归属了酞侧基聚芳醚砜（ＰＥＳ－Ｃ）的１Ｈ－ＮＭＲ谱峰，并经二维同核化学位移相关谱（ＣＯＳＹ）验证．对原１３Ｃ－ＮＭＲ谱峰归属作了部分修正．二维同核及异核相关谱为ＰＥＳ－Ｃ的碳、氢核磁谱峰归属提供了重要信息．由ＰＥＳ－Ｃ的核磁谱图可见其链结构的规整性     

NMR方法表征联萘衍生物 I2,2′-二(对氨苯氧基)-1,1′-联萘

用１Ｈ－ＮＭＲ、１３Ｃ－ＮＭＲ和二维核磁共振技术研究了２，２′－二（对氨苯氧基）－１，１′－联萘的结构，并通过１Ｈ－１Ｈ质子同核相关及１３Ｃ－１Ｈ异核相关谱提供的信息确定了其１Ｈ谱和１３Ｃ谱中各谱峰的归属，为聚合物的表征提供了依据。     

用核磁共振表征对硝基偶氮苯衍生物

用一维＾１ＨＮＭＲ，＾１３ＣＮＭＲ方法研究了对硝基偶氮苯衍生物的结构，并通过二维＾１Ｈ－＾１Ｈ同核相关、＾１３Ｃ－＾１Ｈ异核相关及＾１３－＾１Ｈ异核远程相关谱进一步地确定了该衍生物的＾１Ｈ谱和＾１３Ｃ谱中各谱峰的归属。     

联萘衍生物的NMR表征

用一维＾１Ｈ ＮＭＲ、＾１３Ｃ ＮＭＲ方法研究了２,２’－（３,４－四酸二酐）二苯甲酰氧基－１,１‘－联萘的并通过二维＾１Ｈ－＾１Ｈ同核相关,＾１３Ｃ－＾１Ｈ异核相关及＾１３Ｃ－＾１Ｈ异核远程相关谱进一步地确定其＾１Ｈ谱和＾１３Ｃ谱中各谱峰的归属。为同类化合物的表征提供了依据。     

NMR方法表征联萘衍生物：Ⅰ.2,2‘—二（对氨基氧基）—1,1’—联萘

用＾１Ｈ－ＮＭＲ＾１３Ｃ－ＮＭＲ和二维核共振技术研究了２，２’－二（对氨苯氧基）－１，１’－联萘的结构，并通过＾１Ｈ－＾１Ｈ质子同核相关及＾１３Ｃ－＾１Ｈ异核相关谱提供的信息确定了其＾１Ｈ谱和＾１３Ｃ谱中各谱峰的归属，为聚合物的表征提供依据。     

2,2‘—二（对胺苯甲酯）—1,1’联萘瓣核磁共振谱解析

利用ＨＮＭＲ，＾１３ＣＮＭＲ谱研究了２，２‘－二（对胺苯甲酯）－１，１‘联萘瓣结构，并通过Ｈ＾１－ＨＣＯＳＹ，＾１３Ｃ－Ｈ异核相关及＾１３Ｃ－Ｈ异核远程相关谱进一步地确定了其Ｈ谱和＾１３Ｃ谱中各谱峰的归属，为同类化合物的表征提供了一个依据。’     

硫脲衍生物及其Cu+配合物的NMR研究

对新的配体硫脲衍生物及其Ｃｕ（Ⅰ）配合物Ｎ－（邻硝基苯基）－Ｎ′－（乙氧基羰基）硫脲（Ｈ２ｏｅｔ）（１）,Ｎ－（对硝基苯基）－Ｎ′－（乙氧基羰基）硫脲（Ｈ２ｐｅｔ）（２）,Ｎ－（对硝基苯基）－Ｎ′－（丁氧基羰基）硫脲（Ｈ２ｐｂｔ）（３）和Ｃｕ（Ｈ２ｏｅｔ）２Ｃｌ（４）,［Ｃｕ（Ｈ２ｐｅｔ）２Ｃｌ］·ＣＨ２Ｃｌ２（５）,［Ｃｕ（Ｈ２ｐｂｔ）２Ｃｌ］２（６）作了１Ｈ、１３Ｃ－ＮＭＲ测定,化合物（１）和（６）还进行了Ｈ－ＨＣＯＳＹ（氢－氢相关二维谱）和ＨＭＱＣ（氢核检测的异核多量子相关谱）２ＤＮＭＲ实验,归属了全部的Ｈ、Ｃ谱线;简单讨论了配合物的配位行为。     

2,2'-二(对胺苯甲酯)-1,1'联萘的核磁共振谱解析

利用~1HNMR,~(13)CNMR谱研究了2,2’-二(对胺苯甲酯)-1,1’联萘的结构,并通过~1H-~1HCOSY,~(13)C-~1H异核相关及~(13)C-~1H异核远程相关谱进一步地确定了~1H谱和~(13)C谱中各谱峰的归属,为同类化合物的表征提供了一个依据.     

鱼油多烯脂肪酸乙酯的NMR表征

利用^1H、^13C核磁共振波谱,对鱼油多烯脂肪酸乙酯的结构进行了表征,并通过二维H－^1H相关谱（COSY）和^1H-^13C化学位移相关谱（HETCOR）对各共振峰进行了指认。     

Characterisation of uniformly 13C, 15N labelled bacteriochlorophyll a and bacteriopheophytin a in solution and in solid state: complete assignment of the 13C, 1H and 15N chemical shifts

In this investigation we report a complete assignment of (13)C, (1)H and (15)N solution and solid state chemical shifts of two bacterial photosynthetic pigments, bacteriochlorophyll (BChl) a and bacteriopheophytin (BPheo) a. Uniform stable-isotope labelling strategies were developed and applied to biosynthetic preparation of photosynthetic pigments, namely uniformly (13)C, (15)N labelled BChl a and BPheo a. Uniform stable-isotope labelling with (13)C, (15)N allowed performing the assignment of the (13)C, (15)N and (1)H resonances. The photosynthetic pigments were isolated from the biomass of photosynthetic bacteria Rhodopseudomonas palustris 17001 grown in uniformly (13)C (99%) and (15)N (98%) enriched medium. Both pigments were characterised by NMR in solution (acetone-d(6)) and by MAS NMR in solid state and their NMR resonances were recorded and assigned through standard liquid 2D (13)C-(13)C COSY, (1)H-(13)C HMQC, (1)H-(15)N HMBC and solid 2D (13)C-(13)C RFDR, (1)H-(13)C FSLG HETCOR and (1)H-(15)N HETCOR correlation techniques at 600 MHz and 750 MHz. The characterisation of pigments is of interest from biochemical to pharmaceutical industries, photosynthesis and food research.     

手性镧系位移试剂核磁共振法测定芳氧丙酸酯类除草剂对映体纯度

以Eu(hfc)3和Pr(hfc)3为手性镧系位移试剂(CLSR),比较了两种CLSR对2,4-滴丙酸甲酯的1HNMR和13C NMR谱手性分离效果,结果表明:Pr(hfc)3比Eu(hfc)3对手性中心相连的甲基具有更好的手性分离效果。首次应用Pr(hfc)3测定了盖草能、稳杀得和喹禾灵3种手性芳氧丙酸酯类除草剂的1HNMR和13CNMR谱,其1HNMR谱分离度R约为1,盖草能和喹禾灵的13C NMR谱分离度R大于1.5,说明1H NMR和13CNMR谱手性分离效果适用于对映体纯度测定。与手性色谱法相比,CLSR-NMR法测定对映体纯度具有操作简便、分析速度快的显著优势。     

Characterization of covalent linkages in organically functionalized MCM-41 mesoporous materials by solid-state NMR and theoretical calculations

The covalent linkages formed during functionalization of MCM-41 mesoporous molecular sieves with five chloroalkylsilanes ((EtO)3Si(CH2Cl), (MeO)3Si(CH2CH2CH2Cl), Cl3Si(CH2CH2CH3), Cl2Si(CH3)(CH2Cl) and Cl2Si(CH3)2) have been investigated using high-resolution solid-state NMR spectroscopy and DFT calculations. Structural information was obtained from 1H-13C and 1H-29Si heteronuclear (HETCOR) NMR spectra, in which high resolution in the 1H dimension was obtained by using fast MAS. The 1H-13C HETCOR results provided the assignments of 1H and 13C resonances associated with the surface functional groups. Sensitivity-enhanced 1H-29Si HETCOR spectra, acquired using Carr-Purcell-Meiboom-Gill refocusing during data acquisition, revealed the identity of 29Si sites (Qn, Tn, and Dn) and the location of functional groups relative to these sites. Optimal geometries of local environments representing the Qn, Tn and Dn resonances were calculated using molecular mechanics and ab initio methods. Subsequently, DFT calculations of 29Si, 13C, and 1H chemical shifts were performed using Gaussian 03 at the B3LYP/6-311++G(2d,2p) level. The theoretical calculations are in excellent accord with the experimental chemical shifts. This work illustrates that state-of-the-art spectroscopic and theoretical tools can be used jointly to refine the complex structures of inorganic-organic hybrid materials.     

Complete assignment of 19F, 1H and 13C NMR spectra of monomers and precursors towards bridge trifluoromethylated poly(p-phenylenevinylene)

The complete assignment of 19F, 1H and 13C NMR spectra of 11 trifluoromethylated and four bistrifluoromethylated monomers for bridge trifluoromethylated poly(p-phenylenevinylene) is described. The combination of one-dimensional 19F, 1H and 13C spectra, long-range fluorine couplings and the two-dimensional techniques of direct and long-range HETCOR (J = 140 and 8 Hz) permitted full resonance assignment.     

Experimental and theoretical NMR study of 4-(3-cyclohexen-1-yl)pyridine

(1)H, (13)C, DEPT, COSY, NOESY and HETCOR NMR spectra of 4-(3-cyclohexen-1-yl)pyridine (4-Chpy) have been reported for the first time. (1)H and (13)C NMR chemical shifts of 4-Chpy (C(11)H(13)N) have been calculated by means of the Hartree-Fock (HF) and Becke-3-Lee-Yang-Parr (B3LYP) density functional methods with 6-311++G(d,p) basis set. Comparison between the experimental and the theoretical results indicate that density functional B3LYP method is superior to the scaled HF approach for predicting NMR properties.     

Complete 1H and 13C NMR spectral assignment of symmetric and asymmetric bis-spiropyran derivatives

(1)H and (13)C NMR spectra of symmetric and asymmetric bis-spiropyrans, Series 1-3, were completely assigned. Especially, the (1)H assignment of asymmetric spiropyrans was achieved by utilizing (1)H-(1)H COSY and nOe experiments. All of the carbons in the dye molecules were investigated through a combination of heteronuclear 2D-shift correlation spectroscopy (HETCOR), together with an attached proton test (APT).     

二醋酸纤维素 -聚乙二醇接枝共聚物的核磁共振表征

用^1H NMR和^13C NMR核磁共振技术研究了二醋酸纤维素和聚乙二醇的接枝反应,并确定了^1H NMR和^13C NMR谱中各谱峰的归属,为证明二醋酸纤维素和聚乙二醇的接枝反应提供了依据。