共查询到19条相似文献,搜索用时 78 毫秒
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本文用13C NMR法系统研究了溶液中顺式二氯二氨合铂与胸苷、胞苷、鸟苷和5'-腺嘌呤单核苷酸的作用,确定了不同条件下形成配合物的组成及其分子申铂原子与配体的成键方式。在中性介质中顺铂分别与胸苷、胞苷作用,生成N3配位的顺-[Pt(NH3)2(ThyH-1)2]和顺-[Pt(NH3)2(Cyt)2]2+;与鸟苷随摩尔比不同相应生成顺-[Pt(NH3)2(N2-Guo)2]2+和[Pt(NH3)2(N2,N1-GuoH-1)]nn+,当pH=3和摩尔比为1时,尚有微量[Pt(NH3)2(N7,O(C6)Guo)]2+生成;在中性介质中顺铂与5'-AMP亦随摩尔比不同,生成顺-[Pt(NH3)2(N7-5'-AMP)2]2-或兼生成顺-[Pt(NH3)2(N7,N1-5'-AMP)]n。根据所得结果讨论了顺铂抗癌作用机制,提出了顺铂可能与DNA同一链上相邻二个鸟嘌呤基上的N7N1键合形成链内交联的新机制。 相似文献
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顺-二氯二氨合铂(Ⅱ)与红细胞膜蛋白的相互作用 总被引:3,自引:0,他引:3
顺铂可与红细胞膜蛋白结合,并使膜收缩蛋白交联聚合,巯基是顺铂的可能结合部位,顺铂造成膜蛋白构象或在膜内组装的改变,这些结果支持了我们提出的顺铂作用的多靶分子模型。 相似文献
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本文用非经验的量子化学计算方法-赝势价电子从头计算法计算了顺式和反式[Pt(NH_3)_2Cl_2]及[Pt(NH_3)_2]~(+2),并从得到的波函数计算了分子静电势。分析比较两种构型的计算结果,发现顺式构型和反式构型的分子静电势图具有迥然不同的特征,两种构型的偶极矩也有很大差别。从铂配合物与DNA碱基相互作用的角度讨论了这些差别与抗癌活性的关系,认为静电力在鉑配合物和DNA碱基作用中可能起着某种必要的作用;并进一步提出鉑配合物产生抗癌活性的关键在于应满足与受体互补的要求。这种互补要求应包括:具备和DNA上两个负电中心结合的能力,并宜于和DNA上鸟嘌呤发生链内交联。 相似文献
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用NMR法研究了顺二氨二水合铂(Ⅱ)(AAP)与α-二棕搁酸磷脂酰胆碱(DPPC)的相互作用方式,以阐明在顺铂-细胞相互作用中膜磷脂的贡献。1H及13C谱表明,DPPC与AAP在CDCl3中作用时,铂结合在DPPC的头部并引起DPPC分子中gauche向trans的构象转变。65℃测定DPPC脂质体与AAP在D2O溶液中反应不同时间后的-N(CH3)3、-(CH2)n及-CH3基团1H的T1值表明,铂在磷脂上的结合引起的磷脂构象变化会导致膜分子重新装配。 相似文献
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4.识别图谱的化学方法 4.1 氘代用化学方法将样品中的某些位置上的氢以重氢(~2D)代替之后,与这个氢键接的~(13)C共振峰就发生相应变化,利用这种变化可以识别谱峰。~2D的I=1,因此,CD,CD_2,CD_3的碳顺次表现为三重峰(1:1:1),五重峰(1:3:5:3:1)及七重峰(1:3:5:7:5:3:1),又由于~2D有四极弛豫作用,使~(13)C讯号加宽,这两重原 相似文献
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本文报道二氯二L-天门冬氨酸二乙酯合铂的晶体结构及分子结构。使用美国Syntex R3四圆衍射仪收集到3978个独立的三维强度数据.晶体属单斜品系,空间群为P21,晶胞参数a=8.074(1)A,b=11.309(4)A,c=27.793(9)A,β=106.84°(2),z=4,分子式为Pt(C8H15O4N)2Cl2.用Patterson法解出结构,用块矩阵最小二乘程序修正,最后的R值为0.039结构分析结果表明,Pt(Ⅱ)原子取dsp2杂化轨道正方形配位,二个Cl及L-天门冬氨酸乙二酯分别处于对位位置.N原子采取sp3杂化四面体构型以孤对电子与Pt(Ⅱ)成配键.由于络合物分子内氢键及堆积上的原因使络合物中的L-天门冬氨酸的构型比L型及DL型天门冬氨酸有较大的扭曲. 相似文献
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用逐步中和法,在pH=9.0的条件下合成了二胸苷二氨合铂,用Sephadex G-10分离得到纯配合物,并用元素分析、TG、DTA和~(13)CNMR对此进行了表征。用~1H NMR法测定和计算了配位反应的平衡常数,其值为1gK_1=9.95,1gK_2=6.92。 相似文献
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用分光光度法研究了37℃、pH=5.5、0.1M NaClO4介质中cis[Pt(NH3)2Cl2]和DNA组成物--鸟嘌呤核苷、腺嘌呤核苷、胞嘧啶核苷及胸腺嘧啶核苷的作用。发现顺-[PtⅡ(NH3)2]与前三种核苷能生成组成为1:1、1:2二种络合物,与胸腺嘧啶核苷不作用。所测得一级和二级表观生成常数,以及作用初速分别有如下大小次序:Guo>Ado>Cyt》Thy;Guo>Ado>Cyt》Thy.在所得结果基础上讨论了顺-[Pt(NH3)2Cl2]和癌细胞中DNA作用的可能方式。 相似文献
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Metal Ampoules as Mini‐Autoclaves: Syntheses and Crystal Structures of [Al(NH3)4Cl2][Al(NH3)2Cl4] and (NH4)2[Al(NH3)4Cl2][Al(NH3)2Cl4]Cl2 The salts [Al(NH3)4Cl2]+[Al(NH3)2Cl4]–≡AlCl3 · 3 NH3 ( 1 ) and (NH4+)2[Al(NH3)4Cl2]+[Al(NH3)2Cl4]–(Cl–)2≡ AlCl3 · 3 NH3 · (NH4)Cl ( 2 ) have been obtained as single crystals during the reactions of aluminum and aluminum trichloride, respectively, with ammonium chloride in sealed Monel metal containers. The crystal structure of 1 was determined again [triclinic, P‐1; a = 574.16(10); b = 655.67(12); c = 954.80(16) pm; α = 86.41(2); β = 87.16(2); γ = 84.89(2)°], that of 2 for the first time [monoclinic, I2/m; a = 657.74(12); b = 1103.01(14); c = 1358.1(3) pm; β = 103.24(2)°]. 相似文献
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Ralf Eßmann Guido Kreiner Anke Niemann Dirk Rechenbach Axel Schmieding Thomas Sichla Uwe Zachwieja Herbert Jacobs 《无机化学与普通化学杂志》1996,622(7):1161-1166
The Structures of some Hexaammine Metal(II) Halides of 3 d Metals: [V(NH3)6]I2, [Cr(NH3)6]I2, [Mn(NH3)6]Cl2, [Fe(NH3)6]Cl2, [Fe(NH3)6]Br2, [Co(NH3)6]Br2 and [Ni(NH3)6]Cl2 Crystals of yellow [V(NH3)6]I2 and green [Cr(NH3)6]I2 were obtained by the reaction of VI2 and CrI2 with liquid ammonia at room temperature. Colourless crystals of [Mn(NH3)6]Cl2 were obtained from Mn and NH4Cl in supercritical ammonia. Colourless transparent crystals of [Fe(NH3)6]Cl2 and [Fe(NH3)6]Br2 were obtained by the reaction of FeCl2 and FeBr2 with supercritical ammonia at 400°C. Under the same conditions orange crystals of [Co(NH3)6]Br2 were obtained from [Co2(NH2)3(NH3)6]Br3. Purple crystals of [Ni(NH3)6]Cl2 were obtained by the reaction of NiCl2 · 6H2O and NH4Cl with aqueous NH3 solution. The structures of the isotypic compounds (Fm3 m, Z = 4) were determined from single crystal diffractometer data (see “Inhaltsübersicht”). All compounds crystallize in the K2[PtCl6] structure type. In these compounds the metal ions have high-spin configuration. The orientation of the dynamically disordered hydrogen atoms of the ammonia ligands is discussed. 相似文献
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Trans-[Cr(NH3)4(H2O)Cl]Cl2 (A) crystallizes in the monoclinic space group P21/m (No. 11) with a = 6.556(1), b = 10.630(5), c = 6.729(2) Å and β = 96.15(3)°. Trans-[Cr(NH3)4Cl2]I (B) has monoclinic C2/m (No. 12) space group and a = 9.877(2), b = 8.497(2), c = 6.047(2) Å and β = 108.98(2)°. Both unit cells contain two formula units. Cr? Cl, Cr? O(H2O) and three independent Cr? N(NH3) distances for A are 2.98(1), 2.023(2), 2.067(2), 2.086(3) and 2.064(3) °. Cr? Cl and Cr? N(NH3) bonds in B are 2.325(1) and 2.071(2) °. All octahedral angles are close to 90 and 180°. Both structures were refined to very low R values. Water molecule from trans-[Cr(NH3)4(H2O)Cl]2+ is hydrogen bonded to both ionic chlorides. Cation and two anions form the motive which repeats itself in the crystal. Cations and anions of the second structure are distributed in layers. Each cation and anion have coordination number eight. 相似文献
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