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Bis(5-methyl-2-(2,3-diaza-4-(5-methyl-2-thienyl)buta-1,3-dienyl)thiophene) silver(I) complex was synthesized in high yield by refluxing 5-methyl-2-(2,3-diaza-4-(5-methyl-2-thienyl)buta-1,3-dienyl)thiophene (L) with silver nitrate or silver perchlorate in anhydrous acetonitrile. The product thus formed was well characterized by NMR, IR, UV–Vis and mass spectroscopies as well as elemental analysis and electrochemical analysis. Molecular structures of compounds L, [L2Ag]NO3 and [L2Ag]ClO4 were determined by single crystal X-ray diffraction analysis. It was found that the C=N double bond of the ligand rotated during the course of ligand coordination in the case of the perchlorate salt but not in the case of the nitrate salt. 相似文献
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G. N. Dorofeenko V. V. Mezheritskii Yu. I. Ryabukhin O. V. Ivanova L. G. Minyaeva 《Chemistry of Heterocyclic Compounds》1977,13(3):253-259
A method was developed for the synthesis of 4-oxo-(-ethoxyvinyl)-4H-1,3-benzoxazinium salts by condensation of oxo-2-alkylbenzoxazinium salts by condensation of oxo-2-alkylbenzoxazinium salts with ethyl orthoformate. During hydrolysis and aminolysis, attack of the nucleophile is directed to the -carbon atom of the benzoxazinium salts. The previously unknown 2-formylmethylene-4-oxo-3,4-dihydro-2H-1,3-benzoxazines and their nitrogen derivatives were obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 322–327, March, 1977. 相似文献
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V. G. Alekseev K. A. Nilova S. S. Ryasenskii A. I. Ivanova 《Russian Journal of Inorganic Chemistry》2016,61(1):69-72
Silver(I) salts with benzylpenicillin (Bzp–), ampicillin (Amp–), and oxacillin (Oxa–) anions with compositions of AgBzp, AgAmp, and AgOxa are isolated from an aqueous solution in the solid state and characterized by IR spectroscopy and thermal analysis (TG/DSC). IR spectroscopy data lead to the conclusion that Ag(I) coordinates the Oxa– ion through carbonyl oxygen atoms of the ß-lactam and amide groups. No coordination is observed for the Bzp– and Amp– anions. 相似文献
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The pyramidal O(4)(2)(-) dianion is valence isoelectronic to the well-known ClO(3)(-) and SO(3)(2)(-) anions, and yet it has not been observed. The synthesis of any molecule containing such a dianion would represent a major breakthrough in making molecules containing more than three covalently bound oxygen atoms. We found that the parent H(2)O(4) ozonic acid is unstable in the form of the valence isoelectronic sulfurous acid H(2)SO(3). Our quantum chemical probing of the Li(2)O(4) ionic salt molecule is inconclusive. However, we found that the specially designed FLi(3)O(4) gas phase molecule is a true metastable species and could be considered as the first molecule containing the O(4)(2)(-) dianion. Our theoretical prediction of the first compound containing the tetraatomic covalently bound O(4)(2)(-) dianion opens the possibility to even more oxygen rich compounds, which will have a great potential as high density oxygen storage. 相似文献
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Yuling Xu Han Zhang Stephen Opeyemi Aderinto Zaihui Yang 《Journal of Coordination Chemistry》2016,69(19):2988-2998
Two new silver(I) complexes, [Ag(bebt)(methacrylate)] (1) and [Ag2(bebt)2](pic)2 (2) (bebt = 1,3-bis(1-ethylbenzimidazol-2-yl)-2-thiapropane, pic = picrate), have been synthesized and characterized by physico-chemical and spectroscopic methods. Single-crystal X-ray diffraction revealed that the structure of 1 was four-coordinate in a distorted tetrahedral geometry, while in 2, it may be described as a 2 + 1 coordinated silver(I) compound with a nearly linear N–Ag–N backbone and a weak Ag–S interaction. Two ligands are arranged in a face-to-face syn conformation to coordinate to two Ag(I) ions from opposite directions in 2, generating a U-type double layer structure around the metal ions. Experimental studies of the DNA-binding properties indicated that free bebt and both complexes bind to DNA via intercalation, and the order of the binding affinity is 2 > 1 > bebt. 相似文献
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The synthesis and characterization of nine coordination networks based on 1,3-bis(phenylthio)propane, L(3), and silver(I) salts of PF(6)(-) (1), CF(3)COO(-) (2), CF(3)CF(2)COO(-) (3), CF(3)CF(2)CF(2)COO(-) (4), p-TsO(-) (5, 6), and CF(3)SO(3)(-) (7-9) are reported. Only 1 and other "isostructural" complexes with weakly coordinating anions such as ClO(4)(-) and SbF(6)(-) are of the host-guest type. In all the other complexes, the anions and the acetone molecules, when present, are coordinated to the metal. Most of the complexes studied here form a 2D-coordination network. Only 4 and 5 adopt a polymer-like chain structure. The packing of the chains of 4 is pseudohexagonal compact, while that of 5 is of the centered type. In complex 1, the silver atom is tetrahedrally coordinated to the sulfur atoms of four different ligands. The PF(6)(-) anions and acetone molecules, sandwiched between silver-ligand cationic sheets, are held through van der Waals interactions. In each of the three perfluorocarboxylates (2-4), two silver atoms are joined by the anions in a diatomic bridging mode. The Ag...Ag distances are sufficiently short to indicate weak metal...metal interactions. The dimeric units in 2 and 3 are interconnected through the ligands, thereby generating a 2D-network of neutral sheets, while, in 4, the dimeric units are bound to four ligands and a 1D-coordination polymer is generated. In the case of the sulfonate anions (p-TsO(-) and CF(3)SO(3)(-)), the crystallization solvent influences the structure adopted. Thus, in 5, 7, and 9 obtained from petroleum ether, or other nonpolar solvents, two silver atoms are bound in a double-bridge fashion, while a monobridge mode is noted for 6 and 8, both recrystallized from diethyl ether. In 8, both bridging types are observed. The thermogravimetric investigation, in the room temperature-450 degrees C interval, of complexes 1, 3, and 7, which incorporate acetone molecules in their crystal structures, reveals a two-step weight loss for 1 (the acetone molecules are lost first followed by the ligands, leaving behind the silver salt), while complexes 3 and 7 decompose in a single step to metallic silver. 相似文献
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B. A. Arbuzov G. N. Nikonov A. A. Karasik K. M. Enikeev 《Russian Chemical Bulletin》1991,40(4):804-809
1,3,2,5-Dioxaboraphosphorinanes interact stereospecifically with Cu(I) and Ag(I) salts to form the corresponding O-complexes. The three-dimensional structure of the ligands has been established from31P NMR and1H NMR data.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 906–912, April, 1991. 相似文献
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Dirk Hollmann Mark D. Spicer Jason A.C. Clyburne Colin D. Abernethy 《Journal of organometallic chemistry》2005,690(23):5346-5352
The reactivity of the monomeric N-heterocyclic carbene silver(I) complexes, 1,3-bis-(2,4,6-trimethylphenyl)imidazol-2-ylidene-silver(I) chloride ([Ag(IMes)Cl], 1) and 1,3-bis-(4-bromo-2,6-dimethylphenyl)imidazol-2-ylidene-silver(I) chloride ([Ag(IMesBr)Cl], 2), toward the group 4 metal containing Lewis acids, TiCl4 and (η5-C5H5)ZrCl3, in dichloromethane was investigated. Instead of the expected transfer of the N-heterocyclic carbene to the Lewis acidic metal centers with accompanying precipitation of AgCl, chloride transfer occurred leading to the formation of the salts, [Ag(IMes)2]+[(TiCl3)2(μ2-Cl)3]− (3) and [Ag(IMesBr)2]+[{(η5-C5H5)ZrCl}2(μ2-Cl)3]− (4). The structure of the [Ag(IMesBr)2]+ cation in 4 is significantly distorted in the solid state by interactions between the para-Br atoms of the IMesBr ligands and chloride ligands of the anions. 相似文献
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Carmona D Ferrer J Lorenzo M Santander M Ponz S Lahoz FJ López JA Oro LA 《Chemical communications (Cambridge, England)》2002,(8):870-871
The iridium complex [Ir(mu-Cl)(PN)(PPh3)]2 (1) reacts with H2 affording only the kinetic isomer OC-6-55-C of the dihydride [IrClH2(PN)(PPh3)] (2) and with methanol yielding, also exclusively, the thermodynamic isomer OC-6-53-C (2b) of the same dihydride; complex 2b has been characterised by X-ray diffractometric methods. 相似文献
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M. Petrova E. Liepinsh P. Pastors M. Fleisher V. Kampars 《Chemistry of Heterocyclic Compounds》2008,44(7):820-827
2-Benzylidene-4-aza-1,3-indanediones have been synthesized and their structures have been investigated by NMR spectroscopy
and quantum chemistry in the AM1 approximation. It was established that rotation about the exocyclic C(2)=C(10) formal double
bond occurs in chloroform solutions of these compounds. The energy characteristics of this process have been determined experimentally
and estimated theoretically.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 1024–1032, July, 2008. 相似文献
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Wagner M. Teles Regis de A. Farani Maria Irene Yoshida Adailton J. Bortoluzzi Manfredo Hörner Luiz Fernando C. de Oliveira Flávia C. Machado 《Polyhedron》2007
From the reaction between Zn(NO3)2 · 6H2O and tetrabutylammonium croconate violet ((NBu4)2CV) in the presence of the flexible ligand 1,3-bis(4-pyridyl)propane (BPP) a novel neutral 2-D coordination polymer {[Zn(μ-BPP)(BPP)(CV)(H2O)] · H2O}n (1) was obtained. Compound 1 was characterized by means of elemental analysis, thermogravimetric analysis and vibrational spectroscopy. The crystal structure of 1 reveals that each Zn(II) is coordinated by three nitrogen atoms from two different BPP ligands, two oxygen atoms from one Croconate Violet dianion and one aqua ligand, within a distorted octahedral geometry in a facial arrangement (ZnN3O3). One of the BPP ligands adopts a TG (trans–gauche) conformation bridging two zinc centers giving rise to a 1-D polymeric chain along the crystallographic a axis, and the other is coordinated to metal site in a monodentate fashion adopting a TT (trans–trans) conformation. Adjacent 1-D chains are extended into a 2-D coordination network of (4, 4) topology through cooperative hydrogen bonding involving N31, OW2 and OW1 atoms, in direction of the c axis. Two complementary 2-D sheets fit each other exhibiting an interdigitation phenomenon, giving rise to a bilayer supramolecular structure. 相似文献
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Treatment of 2-trifluoroacetamido-4-(trifluoromethyl)thiazole with two equivalents of n-butyllithium at -78° produced the thiazole dianion 5 in situ, which reacted preferentially at the 5-position with a variety of electrophiles. These electrophiles include: an aldehyde, ketone, chloroformate, acid chloride, phosphorus oxychloride, silicon chloride, and disulfide. Dianion 5 also combined with dibromodifluoromethane at -98° to give the corresponding 5-(bromodifluoromethyl)thiazole 7 , which is an unusual reaction for an aromatic or heteroaromatic system. Compound 7 was converted to a 4,5-bis-(trifluoromethyl)thiazole 8 using tetrabutylammonium fluoride. 相似文献