共查询到20条相似文献,搜索用时 0 毫秒
1.
Constable EC Housecroft CE Kariuki BM Kelly N Smith CB 《Chemical communications (Cambridge, England)》2001,(20):2134-2135
The ligand 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine forms a 1:1 complex with Na[BPh4], which has been structurally characterised as a one-dimensional polymeric system with an unusual coordination geometry about the sodium. 相似文献
2.
M. D. Coburn M. A. Hiskey K.-Y. Lee D. G. Ott M. M. Stinecipher 《Journal of heterocyclic chemistry》1993,30(6):1593-1595
Oxidation of 3,6-diamino-1,2,4,5-tetrazine ( 1 ) with most peracids gave 3,6-diamino-1,2,4,5-tetrazine 1,4-dioxide ( 3 ) as the major product; however, treatment of 1 with peroxytrifluoroacetic acid (PTFA) gave 3,6-diamino-1,2,4,5-tetrazine 1-oxide ( 4 ) as the major product along with a small amount of 3-amino-6-nitro-1,2,4,5-tetrazine 2,4-dioxide ( 5 ). Oxidation of 3,6-bis(S,S-dimethylsulfilimino)-1,2,4,5-tetrazine ( 6 ) with 3-chloroperoxybenzoic acid (MCPBA) gave 3-S,S-(dimethylsulfilimino)-6-nitroso-1,2,4,5-tetrazine ( 7 ), which was oxidized further with dimethyldioxirane to 3-(S,S-dimethylsulfoximino)-6-nitro-1,2,4,5-tetrazine ( 8 ). All attempts to obtain 3,6-dinitro-1,2,4,5-tetrazine ( 2 ) by further oxidation of 7 or 8 failed. 相似文献
3.
4.
5.
The synthesis of 3,6-bis(3,4-dimethoxybenzoyl)-1,2,4,5-tetrazine (2) and the scope of its reactivity in inverse electron demand Diels-Alder reactions are disclosed representing the first systematic study of the [4 + 2] cycloaddition reactions of 3,6-diacyl-1,2,4,5-tetrazines. 相似文献
6.
Newell M Ingram JD Easun TL Vickers SJ Adams H Ward MD Thomas JA 《Inorganic chemistry》2006,45(2):821-827
The synthesis of dinuclear [Ru(II)([n]aneS(4))] (where n = 12, 14) complexes of the bridging ligand 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine are reported. The X-ray structures of both of the new complexes are compared to a newly obtained structure for a dinuclear [Ru(II)([9]aneS(3))]-based analogue, whose synthesis has previously been reported. A comparison of the electrochemistry of the three complexes reveals that the first oxidation of the [Ru(II)([n]aneS(4))]-based systems is a ligand-based couple, indicating that the formation of the radical anion form of the bridging ligand is stabilized by metal center coordination. Spectroelectrochemistry studies on the mixed-valence form of the new complexes suggest that they are Robin and Day Class II systems. The electrochemical and electronic properties of these complexes is rationalized by a consideration of the pi-bonding properties of thiacrown ligands. 相似文献
7.
V. V. Pakal’nis A. Yu. Sokolov A. A. Slisenko M. E. Borovitov S. P. Tunik O. V. Sizova 《Russian Journal of General Chemistry》2009,79(5):980-984
Binuclear bridged complexes [(bpy)2Ru(μ-bptz)Re(CO)3·(Hlg)](X)2 [bptz = 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine; Hlg = Cl, X = BF4 or Hlg = Br, X = NO3]. Were synthesized and studied by mass spectrometry and infrared and electronic spectroscopy. The complexes give a strong long-wave band in the electronic absorption spectrum. The spectra were interpreted on the basis of TD DFT quantum-chemical calculations. 相似文献
8.
9.
10.
Damian Aris Johannes Beck Andreas Decken Isabelle Dionne Ingo Krossing Jack Passmore 《Phosphorus, sulfur, and silicon and the related elements》2013,188(4-5):859-863
Reactions designed to give Se6[Sb(OTeF5)6]2 by the reaction of Se2Br2, 4Se, and 2Ag[Sb(OTeF5)6] lead to products that include [Ag2(Se6)(SO2)2][Sb(OTeF5)6]2(1). The distorted cubic (Ag2Se6 2+) n consists of a Se6 molecule bicapped by two silver cations (local D3d sym.). Reactions of AgMX6 (M = As, Sb) with selenium in liquid SO2 yielded crystals of [Ag2Se6][AsF6]2 (2) and [AgSe6][Ag2(SbF6)3] (3). Both salts contain stacked arrays of [AgSe6]+ half-sandwich cationic units. [Ag2Se6][AsF6]2 in addition contains stronger, linear Se─Ag─Se horizontal linkages between the vertically stacked cationic columns. [AgSe6][Ag2(SbF6)3] features a remarkable three-dimensional [Ag2(SbF6)3]? anion held together by strong Sb─F···Ag contacts between component Ag+ and SbF6 ? ions. Hexagonal channels through this honeycomb-like anion are filled by the stacked [AgSe6 +]x. 相似文献
11.
Ki-Young Choi Nack-Do Sung Ki-Seob Yun Young-Soo Park Jin-Gyu Kim Il-Hwan Suh 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(1):47-48
The title compound, [CuCl(C16H14N4)2]ClO4, consists of a mononuclear complex cation and a perchlorate anion. The coordination of the copper(II) ion exhibits a trigonal bipyramidal geometry, where the equatorial plane is composed of the Cl atom and two N atoms of the two pyridazine rings, and the axial positions are occupied by the N atoms of two methylpyridine rings. 相似文献
12.
Kinga Wzgarda-Raj Justyna Dominikowska Sławomir Wojtulewski Agnieszka J. Rybarczyk-Pirek 《Acta Crystallographica. Section C, Structural Chemistry》2023,79(2):52-60
The results of the X-ray structure analysis of three novel 3,6-bis(pyridin-2-yl)-1,2,4,5-tetrazine cocrystals are presented. These are 3,6-bis(pyridin-2-yl)-1,2,4,5-tetrazine–2,4,6-tribromophenol (1/2), C12H8N6·2C6H3Br3O, 3,6-bis(pyridin-2-yl)-1,2,4,5-tetrazine–isonicotinic acid N-oxide (1/2), C12H8N6·2C6H5NO3, and 3,6-bis(pyridin-2-yl)-1,2,4,5-tetrazine–4-nitrobenzenesulfonamide (1/1), C12H8N6·C6H6N2O4S. Special attention is paid to a conformational analysis of the title tetrazine molecule in known crystal structures. Quantum chemistry methods are used to compare the energetic parameters of the investigated conformations. A structural analysis of the hydrogen and halogen bonds with acceptor aromatic tetrazine and pyrazine rings is conducted in order to elucidate factors responsible for conformational stability. 相似文献
13.
14.
15.
P. A. Slepukhin E. S. Salmina V. A. Potemkin M. A. Grishina 《Journal of Structural Chemistry》2013,54(6):1091-1100
X-ray crystallography is used to investigate heteromolecular crystals of 3,6-bis(3,5-dimethylpyrazole-1-yl)-1,2,4,5-tetrazine with NH-donating azole derivatives. The effect is studied of the structure of azole on molecular packing in the crystal and the characteristics of covalent bonds in the molecule of 3,6-disubstituted tetrazine. The distribution of electron density critical points inside crystal cells is analyzed to identify and quantitatively describe the intermolecular interactions underlying the formation of lateral and stacking motifs. 相似文献
16.
G. L. Rusinov R. I. Ishmetova N. I. Latosh I. N. Ganebnych O. N. Chupakhin V. A. Potemkin 《Russian Chemical Bulletin》2000,49(2):355-362
A number of 1,4-dihydropyridazines and pyridazines were prepared by the Diels-Alder reaction with an inverse electron demand
from cyclic heterodiene systems, 3,6-bis(3,5-dimethyl-4-R-pyrazol-1-yl)-1,2,4,5-tetrazines, and some enamines as well as from
4-vinylpyridine, butyl vinyl ether, phenylacetylene, and acrylamide. The reaction of 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine
with styrene afforded 4,5-dihydropyridazine, which was readily oxidized by atmospheric oxygen to form the corresponding pyridazine.
Electron-withdrawing substituents (Br or Cl) in the pyrazole rings accelerate [4+2]-cycloaddition. When heated, 1,4-dihydropyridazines,
which were synthesized from tetrazines and enamines, eliminated amine to give pyridazines. The reactivities of tetrazines
were evaluated by quantum-chemical methods.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 354–360, February, 2000. 相似文献
17.
18.
《Journal of Coordination Chemistry》2012,65(20):3565-3575
Three supramolecular complexes [Zn(HL1 )2(H2O)2(ZnCl4)2] (1), [Cu(L2 )2Cl2] (2), and [Zn(L3 )Cl2] (3) have been synthesized and characterized by single crystal X-ray diffraction analysis (L1 = 3,5-di(2-pyridyl)-4-amino-1,2,4-triazole, L2 = 3,5-di(2-pyridyl)-1,2,4-triazole, and L3 = 2-pyridinecarboxylic acid (pyridin-2-ylmethylene)-hydrazide). In 1, anion–π interactions between Cl? and the π-systems of L1 are observed and anion–π, hydrogen bonding and π–π stacking interactions link the two complex units of [Zn(HL1 )2(H2O)2]4+ and [ZnCl4]2? to form a 3-D supramolecular network. In 2, π–π stacking interactions between aromatic rings of 1,2,4-triazole and pyridine rings are observed; in 3, hydrogen bonding of Cl ··· H–N and π–π stacking interactions between parallel pyridine rings of L 3 are observed. The mechanisms of rearrangement reactions of L to L1 –L3 are discussed. The fluorescent properties for solid 1 and 3 are also investigated. 相似文献
19.
Bozhou Wang Weipeng Lai Qian Liu Peng Lian Yongqiang Xue 《Frontiers of Chemistry in China》2009,4(1):69-74
3,6-bis(1H-1,2,3,4-tetrazol-5-yl-amino)- 1,2,4,5-tetrazine (BTATz) was synthesized by the condensation of triaminoguanidinium
nitrate with 2,4-pentanedione, followed by oxidation and substitution reaction. The product was characterized by elemental
analysis, IR, NMR spectrometry and DSC analysis. Instead of nitrogen dioxide/N-methylpyrrolidone, acetic acid/sodium nitrite
was used as the oxidizer during the oxidation. Thus, the cost was reduced and the process was simplified. The theoretical
properties of BTATz were estimated by a B3LYP method based on a 6-31G(d,p) basis set, and the stable geometric configuration
and bond order were obtained. The vibrational frequencies, IR spectrum and thermodynamic properties under different temperatures
were obtained from vibrational analysis and the relationship between temperature and thermodynamics properties was deduced.
Pyrolysis mechanism of BTATz was discussedand the transition state and activation energy of ring opening reaction of the tetrazole
were deduced.
__________
Translated from Chinese Journal of Organic Chemistry, 2008, 28(3) (in Chinese) 相似文献
20.
《Mendeleev Communications》2021,31(6):804-806
The reaction of CuI and 3,6-bis(diphenylphosphino)pyridazine (dppz) in MeCN leads to the wheel-shaped complex [Cu8I8(dppz)6], assembled from four [Cu2I2] units and six dppz ligands. This complex exhibits thermochromic luminescence with emission colors ranging from red (300 K) to deep red (77 K). When carried out in the presence of PPh3, the reaction of CuI with dppz gives a non-emissive cage-like complex [Cu2I2(dppz)3], in which two CuI units are P,P′-bridged by three dppz ligands. 相似文献