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As the first set of stereomeric donor-acceptor cyclophanes with TCNQ as an acceptor, and were synthesized; their charge-transfer absorptions differ strongly as a consequence of the different donor-acceptor orientation. 相似文献
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Walter Ponikwar Peter Mayer Holger Piotrowski Peter Swoboda Claus‐Jürgen Oetker Wolfgang Beck 《无机化学与普通化学杂志》2002,628(1):15-19
Pseudohalogeno Metal Compounds. LXXVIII. Structures of Planar and Tetrahedral Tetrafulminato Metal Complexes: [N(C3H7)4]2 [Ni(CNO)4], [N(C3H7)4]2 [Pt(CNO)4], and [N(C3H7)4]2 [Zn(CNO)4] The crystals contain the tetrafulminatometallates of an ideal square planar structure ([Ni(CNO)4]2–, [Pt(CNO)4]2–) with D4h symmetry at the nickel and platinum atom and a tetrahedron ([Zn(CNO)4]2–) with perfect Td symmetry at the zinc atom and with linear C≡N–O ligands. The metal carbon bonds (Ni–C: 187 pm, Pt–C: 200 pm, Zn–C: 201 pm) of the metal fulminates are very close to those of the corresponding cyano complexes. In the crystals the anions ([Ni(CNO)4]2–, [Pt(CNO)4]2–, [Zn(CNO)4]2–) are separated by the cations ([N(C3H7)4]+) which explains the thermal stability of these compounds. 相似文献
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The formation and trapping of bicyclo[3.1.0]hex-(1,5)-ene and bicyclo[4.1.0]hept-(1,6)-ene from the corresponding vicinal dibromides is described. 相似文献
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Structurally Chemical Investigation of Monoammin Copper (I) Complexes : [CuNH3]2[Pt(CN)6], [CuNH3]2[Pt(CN)4] and Cu3[Co(CN)6] · 2NH3 The preparation and the properties of [CuNH3]2[Pt(CN)6], [CuNH3]2[Pt(CN)4] and Cu3[Co(CN)6] · 2NH3 are described. I.R. and Raman spectra have been recorded and assigned. According to X-ray powder diagrams, [CuNH3]2[Pt(CN)6] crystallizes in the trigonal space group D–P3 ml, a = 7.771, c = 5.988 Å, Z = 1. According to the spectroscopic and crystallographic data, it is concluded that the CuI ion is coordinated with one NH3 group and with the N atoms of the cyanometallate anions. The coordination number of the Cu+ is 4 in [CuNH3]2[Pt(CN)6] and 3 in [CuNH3]2[Pt(CN)4]. In the Cu3[Co(CN)6] · 2 NH3 complex two Cu atoms have the coordination number 2, the third Cu atom 4. 相似文献
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Syntheses and Characterization of [Ni(tBuAs)6] and [Pd(tBuAs)6] The reduction of tBuAsCl2 with magnesium in the presence of NiCl2 or PdCl2 yields the complexes [Ni(tBuAs)6] ( 2 ) and [Pd(tBuAs)6] ( 3 ). The structure of ( 2 ) was determined by X-ray single crystal structure analysis. ( 2 ) consists of the sixmembered ring (tBuAs)6 in chair conformation with the nickel atom in the center of this ring. 相似文献
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S. I. Pechenyuk Yu. P. Semushina D. P. Domonov N. L. Mikhailova 《Russian Journal of Coordination Chemistry》2006,32(8):572-574
The double complex salts [Ni(NH3)6]3[Fe(CN)6]2 and [Ni(NH3)6]3[Cr(CNS)6]2 were synthesized and their thermal decomposition in air was studied. The values of interplanar distances in crystal lattices were determined. The compounds are proposed as precursors for producing homogeneous bimetallic nanodimensional powders. 相似文献
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Dr. Ewa Pacholska-Dudziak Dr. Sandra Hojniak-Thyssen Prof. Dr. Lechosław Latos-Grażyński 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(51):11859-11863
An expanded triphyrin containing a bipyrrole moiety and annulene links, namely tetraphenyl-[22]triphyrin(6.5.0), 2 , has been synthesized. The synthesis proceeded by a postsynthetic transformation of tetraphenyl-[22]triphyrin(6.6.0), 1 , in a metal-free unexpected and unprecedented ring contraction during column chromatography on alumina. The observed transformation, located at the hydrocarbon chain linking the pyrrole units, formally corresponds to a subtraction of one carbon atom from an annulene circuit. In contrast to the flexible substrate 1 , the product 2 is conformationally rigid, and capable of chloride anion binding in its protonated form. 相似文献
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Jan Ellermeier Ralph Sthler Wolfgang Bensch 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(2):m70-m73
Both title compounds, bis[tris(2‐aminoethyl)amine]nickel(II) dichloride, [Ni(tren)2]Cl2, (I), and bis[tris(2‐aminoethyl)amine]nickel(II) tetrathiotungstate, [Ni(tren)2]WS4, (II), contain the [Ni(tren)2]2+ cation [tren is tris(2‐aminoethyl)amine, C6H18N4]. The tren molecule acts as a tridentate ligand around the central Ni atom, with the remaining primary amine group not bound to the central atom. In (I), Ni2+ is located on a centre of inversion surrounded by one crystallographically independent tren molecule. In the [Ni(tren)2]2+ cation of (II), the Ni atom is bound to two crystallographically independent tren molecules. The Ni atoms in the [Ni(tren)2]2+ complexes are in a distorted octahedral environment consisting of six N atoms from the chelating tren molecules. The counter‐ions are chloride anions in (I) and the tetrahedral [WS4]2? anion in (II). Hydrogen bonding is observed in both compounds. 相似文献
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H ? C Bond Cleavage in Ferrocene by Organylruthenium Complexes Cp*(Me3P)2RuCH2CMe3 ( 1 ) reacts at 85°C with ferrocene ( 2 ) by cleavage of one H? C bond in 2 to give CpFe[η5-C5H4Ru(PMe3)2Cp*] ( 3 ) (Cp = η5-C5H5; Cp* = η5-C5Me5) and neopentane. The ruthenium atom in 3 has a distorted tetrahedral geometry, the planar Cp ligands in the ferrocenyl fragment are eclipsed. Solutions of 3 in [D6]benzene or [D8]THF exhibit H? D exchange of the ferrocenyl protons. In the [D8]THF molecule only the α-deuterium atoms are exchanged. Reaction pathways for this exchange are discussed. 相似文献
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