Reactions of anionic porphyrin with group 11 elements: a spectrophotometric and electrospray ionization mass spectrometry study

The reaction of 3,8,13,18-tetramethyl-21H,23H-porphine-2,7,12,17-tetrapropionic acid or coproporphyrin-I (CPI) with the elements of 11 group have been studied. CPI is an anionic porphyrin that slowly reacts with copper ion to form Cu^IICPI and with silver ions to form Ag^IICPI, Ag^IIICPI complexes and colloidal silver. Gold ions do not form complexes with CPI, but, in the main, colloidal gold and some CPI-N-oxide. The kinetics of the reactions with copper and silver were spectrophotometerically studied and the rate constants were calculated. The identification and characterization of this water-soluble anionic porphyrin and its metal complexes have been performed by electrospray mass spectrometry (ESI-MS) that proved to be an excellent method for these determinations. The multiple charged parent ions for metal free ligand and their metal complexes were identified.     

X-ray crystal structure of 2-hydroxy-2′-(1,4-bisoxo-6-hexanol)-1,1′-biphenyl

The X-ray crystal structure of 2-hydroxy-2-(1,4-bisoxo-6-hexanol)-1,1-biphenyl, 3, is presented. This molecule crystallizes in the monoclinic space group P2₁/n (a = 9.440(2), b = 12.679(3), c = 11.679(3) Å = 94.60(2)° V = 1382.5(5) ų; Z = 4). One of the unique features of the X-ray structure of 3 is the intramolecular hydrogen bonding. The hydrogens of the phenolic and hydroxy groups occupies bridging positions via hydrogen bonding to an ether oxygen (O₁) and a phenolic oxygen (O₄), respectively. This hydrogen bonding does not affect the interplanar angle between phenyl rings (49.34°), which is in the range expected for ortho-disubstituted biphenyl compounds. The hydrogen bonding of this type explains why it is difficult to alkylate both phenoxy groups of 2,2-biphenol with tetrahydropyranyl protected 2-(2-chloroethoxy)ethanol.     

Synthesis,characterization, and in vitro antiproliferative and antibacterial studies of tetraazamacrocyclic complexes of Co(II) and Cu(II) with pyromellitic acid

New cationic tetranuclear Co(II) and neutral binuclear Cu(II) complexes with tpmc (N,N′,N″,N″′-tetrakis-(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane) and bridging pyromellitate ligand pma (tetraanion 1,2,4,5-benzenetetracarboxylic acid) were isolated. The composition of the compounds is proposed based on elemental analyses (C, H, N, M=Cu, Co), molar conductivity determination, UV-Vis, FTIR, EPR, LC-MS and reflectance spectroscopy, magnetic measurements, cyclic voltammetry, as well as TG and DTA. It is proposed that in [Co₄(pma)(tpmc)₂](ClO₄)₄·6H₂O (1), cobalt(II) is six-coordinate out of cyclam rings and one OCO^? from pma participates in coordination with one Co(II). In the case of [Cu₂(pma)tpmc]?8H₂O (2), one OCO^? from pma bridges two Cu(II). The cytotoxic activity of 1 and 2 was tested against tumor cell lines human cervix adenocarcinoma (HeLa), estrogen-receptor-positive human breast cancer (MCF-7), human myelogenous leukemia (K562), and the human Caucasian Burkitt’s lymphoma (Ramos). The IC₅₀ values for 1 and 2 were within the range 44.66 ± 2.39 to 152.40 ± 2.28 μM, and from 140.88 ± 3.51 to 192.05 ± 2.09 μM, respectively. Both 1 and 2 were tested for antimicrobial activity. We determined that minimal inhibitory concentration for 1 against Staphylococcus aureus, Bacillus subtilis, and Klebsiella pneumoniae was 25 mM. Complex 2 did not express activity against tested microbial strains.     

Constructing supramolecular polymers from phototrigger containing monomer

A new type of strategy for photo-induced supramolecular polymerization based on hostguest interaction has been explored. A kind of monomer containing dibenzo-24-crown-8 (DB24C8) macrocycle and dibenzylammonium (DBA) site was designed and synthesized. The coumarin, as a photocleavable protector, was introduced to the end of the monomer whose polymerization can be irradiated by UV light via the hostguest interactions between DB24C8 moieties and DBA units.     

二苯并18冠6及二苯并24冠8与六聚钼钨杂多酸超分子配合物的合成与晶体结构

报道了两种超分子配合物［Ｎａ（ＤＢ１８Ｃ６）（ＣＨ＿３ＯＨ）］＿２Ｗ＿４Ｍｏ＿２Ｏ＿（１９）·（ＤＢ１８Ｃ６）·（ＣＨ＿３ＯＨ）（Ⅰ）和［Ｎａ（ＤＢ２４Ｃ８）］＿２Ｗ＿１Ｍｏ＿５Ｏ＿（１９）（Ⅱ）的合成方式，用元素分析、电子能谱、ＩＲ和１ＨＮＭＲ等手段进行了表征，并用Ｘ射线测定了晶体结构。结构分析表明：配合物（Ⅰ）属单斜晶系，空间群为Ｐ２１／ｃ，晶胞参数：α＝１．８６９９（５）ｎｍ，ｂ＝１．９５４３（５）ｎｍ，ｃ＝２．２８０８（６）ｎｍ，β＝１１２．８７°，Ｚ＝４．冠醚与多酸根之间通过Ｎａ＋在ＤＢ１８Ｃ６空腔中的镶嵌和Ｏ—Ｎａ—Ｏ键的桥联结合在一起。超分子配合物（Ⅱ）则为Ｎａ＋与ＤＢ２４Ｃ８作用形成配位阳离子，然后与多酸阴离子静电吸引相结合。不同空腔孔径的冠醚与钼钨杂多酸配位时呈现出分子识别与选择性。     

{[（NH4）（18—冠—6）][Bi（NCS）Cl3]}n的合成及结构

用凝胶法合成了标题配合物,并进行了元素分析、红外光谱、质谱及差热-热重等物性表征;用四圆衍射仪测定了它的晶体结构。晶体属三斜晶系、空间群P1,晶胞参数α=9.097(2),ι=15.754(3),(?)=16.556(2),(?)=88.08(1)°,(?)=81.29(1)°,(?)=86.62(2)°Z=2。结构分析表明,该配合物中冠醚与铵离子形成配阳离子;铋(Ⅲ)由硫氰酸根和氯离子配位,并以配体桥联形成链状聚合的配合阴离子,配合阴、阳离子主要以静电吸引形成配合物。     

Crystal structures of inclusion compounds of 4-aminobenzenesulfamidine (sulfaguanidine) with two dicyclohexano-18-crown-6 isomers

The crystal structures of inclusion compounds of 4-aminobenzenesulfamidine (sulfaguanidine) (L) with two dicyclohexano-18-crown-6 (DCH-6) isomers A(cis-syn-cis) and B(cis-anti-cis) have been determined by X-ray methods. The complexes exhibit 1:2 host-guest ratios. In fact the complex of isomer A is formulated as [DCH-6^A·[L]H₂O]L (complexI), while that of isomerB is DCH-6 ^B L₂ (complex I1).In the crystals, host and guests are connected by O-H...0 and N-H...O bonds.     

Kronenether-funktionalisierte Carbosilandendrimere

The synthesis of the allyloxymethyl-functionalized crown ethers of type CH₂CHCH₂OCH₂[15-crown-5] (3a) and CH₂CHCH₂OCH₂[18-crown-6] (3b) can be achieved by treatment of HOCH₂[15-crown-5] (1a) and HOCH₂[18-crown-6] (1b) with CH₂CHCH₂Br (2) in presence of KOH. The hydrosilylation of 3a and 3b with Si(CH₂CH₂CH₂SiMe₂H)₄ (4) and Si(CH₂CH₂CH₂SiMe(CH₂CH₂CH₂SiMe₂H)₂)₄ (6) in presence of the Karstedt catalyst affords the respective crown ether end-capped carbosilane dendrimers Si(CH₂CH₂CH₂SiMe₂CH₂CH₂CH₂OCH₂[15-crown-5])₄ (5a), Si(CH₂CH₂CH₂SiMe₂CH₂CH₂CH₂OCH₂[18-crown-6])₄ (5b), Si(CH₂CH₂CH₂SiMe(CH₂CH₂CH₂SiMe₂CH₂CH₂CH₂OCH₂[15-crown-5])₂)₄ (7a) and Si(CH₂CH₂CH₂SiMe(CH₂CH₂CH₂SiMe₂CH₂CH₂CH₂OCH₂[18-crown-6])₂)₄ (7b). The latter dendrimers are obtained in almost quantitative yield. The complexation behaviour of 5 and 7 towards different alkali metal cations is discussed.     

苯基重氮盐-冠醚分子嵌合物的FAB-MS及其准分子离子生成机理的研究

苯基重氮盐质谱研究曾有报导,它同冠醚分子形成的嵌合物质谱也被测定过。本文采用快原子轰击(FAB)研究了苯基重氮盐,(R=OCH_3,CH_3,H,Br,Cl,F,NO_2)同18-冠醚-6以及二苯并-24-冠醚-8形成分子嵌合物的质谱(MS),讨论这类嵌合物准分子离子MNa~ 丰度同嵌合物内授-受键的性质之间的关系,并由分子轨道方法计算结果解释了MNa~ 的丰度同苯基重氮盐上取代基R性质的关系。     

KI-醚类催化剂催化二氧化碳和环氧乙烷合成碳酸乙烯酯反应研究

合成了５个含有金属铁的环醚Ｆｅ（ＣＯ）３Ｌ（Ｌ１＝Ｐｈ２Ｐ（ＣＨ２ＣＨ２Ｏ）２ＣＨ２ＣＨ２ＰＰｈ２，Ｌ２＝Ｐｈ２Ｐ（ＣＨ２ＣＨ２Ｏ）４ＣＨ２ＣＨ２ＰＰｈ２，Ｌ３＝ＯＰｈ［（ＯＣＨ２ＣＨ２）ＰＰｈ２］２，Ｌ４＝ＯＰｈ［ＯＣＨ２ＣＨ２）２ＰＰｈ２］２）和［Ｆｅ（ＣＯ３）］２Ｌ５（Ｌ５＝［Ｐｈ２ＰＣＨ２ＣＨ２ＯＣＨ２ＣＨ２ＰＰｈ２］２）．对它们进行了元素分析，并用红外光谱和核磁共振谱进行了结构表征．用ＫＩ＋醚类为催化剂，催化二氧化碳与环氧乙烷反应生成碳酸乙烯酯，反应选择性大于９６．９％．催化机理为碱催化，催化剂的活性受醚的影响．能和Ｋ＋形成稳定配合物的醚可提高催化剂的活性．含金属铁的环醚和普通醚类相似，可以和钾离子作用，提高阴离子的亲核催化性能．