Theoretical Study on the Mechanism Properties of a Novel Trans-platinum Antitumor Drug

1 INTRODUCTION Cis-diamminedichloroplatinum(II) (cis-DDP) is a widely used drug in dealing with many human carcinomas, such as testicular carcinoma, ovarian carcinoma, etc.[1～4]. Despite of its great success in treating many kinds of cancers, the antitumor drug does have many limitations, for example, several side effects or both intrinsic and acquired resis- tance[5, 6]. In order to solve these problems, various platinum complexes have been tested over the past years[7～19]. The clas…     

Synthesis and Crystal Structure of cis—[meso—1,3—Bis（propylsulfinyl）propane]dichloroplatinum（Ⅱ）

1 INTRODUCTION A number of Pt complexes with monosulfoxide have been isolated and characterized[1]. It was indicated that the sulfoxide group trends to coordinate to soft metals (Pt, Pd, etc.) by its sulfur atom[2]. Pt(Ⅱ) trends to bond to disulfoxides in cis-mode and such complexes have potential antitumor activity[2]. However, only few examples of such complexes have been structurally characterized[3]. We will report herein the crystal structure of a new Pt(Ⅱ) complex with a disulf…     

Synthesis and Crystal Structure of [(ArO)_2(THF)Sm(μ-OH)]_2·2THF(Ar=C_6H_(2-)~tBu_3-2,4,6)

1 INTRODUCTION Sm(II) chemistry has been extensively studied due to the strong reduction potential of this 4f6 ion[1]. The transformation of unsaturated substrates by Sm (II) complexes into products with unusual structures is one of the most interesting research areas. For the successful examples reported, Sm(II) starting mate- rials were restricted primarily to cyclopentadienyl complexes[2]. The reactivity of Sm(II) complex with phenolate ligands has seldom been explored. Recen- tl…     

Synthesis and Structural Characterization of [Mn（sapn）（H2O）2]Br

1 INTRODUCTION Many of the recent advances in the coordination chemistry of manganese have been driven by the involvement of the manganese in several biological redox-active systems[1,2], of which the most important is the oxygen-evolving complex (EOC) of photosystem II (PS II) in green plants [3]. Since the preparations and structural characterizations of the complexes containing N,O-donor ligands have been studied extensively as simple active-site models for the photosystem II[4,5]…     

Preparation of Platinum(II) Complexes with 1-β-D-Ribofuranosyl-1,2,4-triazole-3-carboxamide and its Deoxy-analogue

Much attention is currently focused on the design of new generations of platinum anti-cancer complexes to prevent resistance of cisplatin. We have developed a new platinum-based antitumor agent with broad-spectrum antiviral activity. The cis-[Pt(DMSO)2Cl2] and K[Pt (DMSO) Cl3] reacted with 1-??-D-ribofuranosyl-1,2,4-triazole-3-carboxamide (ribavirin) and its deoxy-analogue (deoxyribavirin) to give the coordinated complexes which exhibited activity against both DNA and RNA viruses1. The…     

Synthesis and Crystal Structure of a Copper(II) Complex with 2,4-Dihydroxybenzylidene Benzoylhydrazone Ligand

1 INTRODUCTION The chemical properties of acylhydrazones Schiff bases and their complexes with some transition metal ions have been intensively investigated in several re- search areas because of their chelating capability and pharmacological applications[1～10]. Intriguingly, the copper(II) complexes are shown to be signifycantly more potent than the metal free chelate, suggesting that the metal complex is the biologically active species. Owing to the biological interest in these types …     

Synthesis and Crystal Structure of 2-Nitrophenyl N,N-Bis(2-chloroethyl)-N'-(4-methylbenzene- sulfonamino)ethyl-phosphorodiamidate

1 INTRODUCTION Nitrogen mustards (NMs) are useful chemothe- rapeutic agents in the treatment of lymphoma, leuke- mia, multiple myeloma and ovarian carcinoma[1]. The antitumor activity of NMs has been attributed to their ability to cross-link the twin strands of DNA. Phosphoramide mustard is also an alkating agent that cross-links interstrand DNA, such as cyclophos- phamide (CP) , ifosfamide (IFA) and trofosf- amide[2～5]. Cyclophosphamide is a widely used anticancer alklating agent …     

Theoretical Investigation of Detailed Thermodynamic Character of Possible Difunctional Adducts Model

1 INTRODUCTION Since cisplatin was recognized as an active sub- stance in the antitumor treatment in 1960s, many studies have been devoted to the exploitation of pla- tinum complexes, focusing on the influence of dif- ferent ligands and conformers on the cancer acti- vity[1~7]. Thousands of Pt complexes evaluated for antitumor activity adhered to the set of structure- activity relationship summarized by Cleare and Ho- eschele[1, 8], for instance, cispaltin, carboplatin and oxaliplatin pos…     

Syntheses and Crystal Structures of Cd(Ⅱ) and Ni(Ⅱ) Complexes Containing Flexible Sulfide and Nitrogen Heterocyclic Ligands

Two new coordination polymers [Cd(EBLA)(ip)(H2O)](1) and [Ni(EBSA)(im)2(H2O)]n(2) were synthesized by hydrothermal and solution methods using 2,2'-dithiosalicylicacid(EBSA), 1H-imidazo[4,5-f][1,10]phenanthroline(ip), imidazole(im), Cd(NO3)2·4H2O and Ni(NO3)2·6H2O. The complexes were characterized by elemental analysis and FT-IR. Meanwhile, the crystal structures, fluorescence properties of complex 1 and thermogravimetrie analysis of complex 2 have been studied. In complex 1, 2,2'-dicarboxydiphenylthioether(EBLA) was prepared with 2,2'-dithiosalicylicacid(EBSA) in situ reaction by hydrothermal method. Complex 1 is a dinuclear structure and Cd2+ is five-coordinated in a distorted trigonal bipyramidal geometry. Complex 2 is a one-dimensional infinite linear chain and Ni2+ is six-coordinated to form a distorted octahedral geometry. Hydrogen bonding and π-π interactions are observed in these complexes.     

Studies on the Interaction of Cobalt Mixed-Ligand Coordination Compound Containing Tetrapyrido [3,2-a:2′,3′-c:3″, 2″-h:2■,3■-j] phenazine with DNA

A new monometallic complex [Co(phen)_2tpphz]~(3+) (where tpphz is tetrapyrido [3,2-a:2′,3′-c:3″,2″-h:2′″,3′″-j] phenazine) was synthesized by the reaction of 5, 6-diamino-1,10-phenanthroline with [Co(phen)_2(phendione)]~(3+). It was characterized by elemental analysis, molar conductivity, IR, ~1H NMR, ultraviolet and fluorescence spectroscopy. The interaction of the complex with DNA was also investigated. The complex shows the absorption hypochromicity, fluorescence enhancement, the specific viscosity increased when bound to calf thymus DNA. The cyclic voltammetry (CV) measurement showed a change in peak current with the addition of DNA. All the results provide the support for the intercalative binding mode of the mononuclear complex.     

Metal Vector Manipulated Molecular Self-Assembly from Werner System to Cotton System

A definition of metal vector was given to coordinatively unsaturated metals or asymmetrically coordinated metal complexes in which the metal center is partly blocked by inert chelating ligand(s), thus possess specific reactivity and directionality, such as cis-coordinated square Pd(II) or Pt(II) complexes. Metal vectors have been extensively used in coordination catalysis and molecular assembly. In 1990, Fujita [1] first demonstrated the utility of cis-coordinated square Pd(II) or Pt(II) …     

A New Nickel(Ⅱ) Coordination Compound Constructed by Pyridyl-triazole and Oxybis(Benzoic Acid): Synthesis,Crystal Structure and the Effect on the Thermal Decomposition of Ammonium Perchlorate

A new energetic complex, Ni(3,4'-Hbpt)2(Hoba)2(H2O)2(3,4'-Hbpt = 3-(3-pyridyl)-5-(4'-pyridyl)-1-H-1,2,4-triazole and H2 oba = 4,4'-oxybis(benzoic acid)), has been synthesized by hydrothermal reaction and characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, thermogravimetric analyses and X-ray powder diffraction. Single-crystal X-ray diffraction analysis indicates that the complex belongs to the monoclinic system, space group P21/c with a = 10.2357(9), b = 24.594(2), c = 10.4225(9) A, β = 114.0110(10)°, V = 2396.7(4) A3, Dc =1.460 g/cm3, μ = 0.482 mm-1, Mr = 1053.63, F(000) = 1088, Z = 2, the final R = 0.0358 and wR =0.0973 with I 2σ(I). Both 3,4'-Hbpt and H2 oba ligands adopt monodentate modes linking one Ni(II)ion to form a 0D motif. Furthermore, the 0D motifs are linked into a 3D supramolecular architecture with hydrogen bonds. In addition, the catalytic performance for thermal decomposition of the efficacy of ammonium perchlorate(AP) is explored by differential scanning calorimetry(DSC),which indicates that the complex is a good candidate for a promoter of the thermal decomposition of ammonium perchlorate.     

Synthesis and Crystal Structure of Tetraaquacopper(II) Bis(5-fluorouracil-1-acetate) Tetrahydrate

1 INTRODUCTION 5-Fluorouracil (5-FU) is an antimetabolite with good antimicrobial and antitumor activities but has toxic side effects[1~4]. In order to improve the topical delivery of 5-FU and reduce the side effects, many derivatives of 5-FU have been synthesized, some of which are of improved activity. 5-Fluorou- racil-1-acetic acid is a member of the family[5~8], which belongs to the pyrimidine base and is a cyto-toxic analogue of the natural base thymine, and has proven useful in th…     

Chemical Biology Studies on Molecular Diversity of Annonaceous Acetogenins

Annonaceous acetogenins, isolated from the Annonaceae plants, have been attracting worldwide attention in recent years due to their biological activities, especially as growth inhibitors of certain tumor cells [1]. They have been shown to function by blocking complex I in mitochondria [2] as well as ubiquinone-linked NADPH oxidase in the cells of specific tumor cell lines, including some multidrug-resistant ones [3]. These features make these acetogenins excellent leads for the new antitumor…     

Synthesis and Crystal Structure of Organic Salt (H_2Bpy)(cda)_2 (cda = Carbamyldicyano-methanide Anion; H_2bpy = Hydrogen 4,4''''-Bipyridyl Divalent Cation)

1 INTRODUCTION Polynitrile compound Na(cda) is a very useful ligand and its complexes have been synthesized[1～3], in which the two-dimensional Eu(III) complex exhi- bits the strongest fluorescence and non-linear optic property[4]. We originally want to…     

Synthesis and Crystal Structure of a Copper(II) Complex with α-Hydroxylated Acid, [Cu(C_(14)H_8O_3)(C_5H_(13)NO)(H_2O)].0.5H_2O

1 INTRODUCTION There has been considerable interest of copper(II) -hydroxylate complexes in the structural chemistry and biochemistry. There are two structural types in copper(II) -hydroxylate com- plexes: mononuclear[1~6] and dinuclear structure[7~9]. The present work is a part of our study on the copper complexes of -hydroxylated acid and reports the synthesis and structure of a mononuclear copper(II) complex with 9-hydroxy- fluorene-9-carboxylato acid, [Cu(C14H8O3)(C5H13- NO)(H…     

Photosynthesis and Molecular Structure of2—Amino—3H—phenoxazin—3—one

1 INTRODUCTION 2-Amino-3H-phenoxazin-3-one (APX) is related to the naturally occurring antineoplastic actinomycin D and has been used as a chemical model of actinomycin D[1]. Usually APX is synthesized from 2-aminophenol with the phenoxazinone synthase in human body[2]. A variety of artificial synthesis methods of APX via the oxidation of 2-aminophenol have also been reported, but each method needs some artificial condition such as chemical catalysis[3～7], natural enzyme[8], UV…     

Syntheses and Crystal Structures of Methyl 2-（4,5-Dibromo- 1-methylpyrrole-2-carbonylamino）-3-phenyl propanoate and 4,5-Dibromo-1-methyl-2-trichloroacetylpyrrole

1 INTRODUCTION Pyrrole and its derivatives have attracted much attention due to their chemical properties as well as biological activities[1]. They have been widely used as the materials to produce pharmaceutical, essences, biochemicals, etc. It has been found that a great deal of pyrrole derivatives present bioactivities, such as antitumor and antiviral activities[2~5]. Thus, due to the interest in exploring the syntheses of potential bioactive materials which contain pyrrole ring andna…     

Cleavage of the Fe—Fe Bond of （Me2SiSiMe2） [η^5－C5H4Fe（CO）2]2 with Na／Hg and Molecular Structure of the Ring－Opened Complex

The reaction of the rifle cyclic complex (1) with sodium amalgam in THF resulted in the expected cleavage of the Fe-Fe bond to afford his-sodium salt ( Me2SiSiMe2 ) [η^5-C5H4Fe(CO)2]2 (4). The latter was not isolated and was used directly to react with MeI, PhCH2Cl, CH3C(O)Cl, PhC(O)Cl,Cy3SnCl (Cy= cyclohexyl) or Ph3SnCl to afford corresponding ring-opened derivatives (Me2SiSiMe2) [η^5-C5H4Fe(CO)2]2 [5, R=Me; 6, R=PhCH2; 7, R=CH3C(O); 8, R=PhC(O); 9, R = Cy3Sn or 10, R = Ph3Sn ]. The crystal and molecular structures of 10 were determined by X-ray diffraction analysis. The molecule took the desired ant/ conformation around the Si-Si bond. The length of the Si--Si bond is 0.2343(3)nm, which is essentially identical to that in the cyclic structure of 1[0.2346(4) tun]. This result unambiguously demonstrates that the Si--Si bond in the cyclic structure of 1 is not subject to obvious strain.     

顺式-二(硫氰酸根)·二氨合铂(Ⅱ)的合成、表征及其水溶液析出物质机制的探讨

Cis-diaminedithiocyanatoplatinum(Ⅱ) (cis-[Pt(SCN)₂(NH₃)₂]) was prepared and characterized through content analysis of Pt, MS, IR. The results show that the complex has cis configuration and the bond type of Pt and SCN^- is Pt-S. When the aqueous solution of the complex was stored for one week, an orange-yellow precipitation appeared, different from the complex with light yellow color. Further comparative studies of these two complexes suggested that the precipitation is cis-[Pt(NCS)₂(NH₃)₂], the linkage isomerism of cis-[Pt(SCN)₂(NH₃)₂]. The mechanism of the isomerism reaction is also discussed.