共查询到20条相似文献,搜索用时 11 毫秒
1.
Min Min Zhao Zhi Rong Qu 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(8):m215-m217
The structure of the title compound [systematic name: bis(adamantan‐1‐aminium) tetrachloridozincate(II)–1,4,7,10,13,16‐hexaoxacyclooctadecane–water (1/1/1)], (C10H18N)2[ZnCl4]·C12H24O6·H2O, consists of supramolecular rotator–stator assemblies and ribbons of hydrogen bonds parallel to [010]. The assemblies are composed of one protonated adamantan‐1‐aminium cation and one crown ether molecule (1,4,7,10,13,16‐hexaoxacyclooctadecane) to give an overall [(C10H18N)(18‐crown‐6)]+ cation. The –NH3+ group of the cation nests in the crown and links to the crown‐ether O atoms through N—H...O hydrogen bonds. The 18‐crown‐6 ring adopts a pseudo‐C3v conformation. The second adamantan‐1‐aminium forms part of ribbons of adamantan‐1‐aminium–water–tetrachloridozincate units which are interconnected by O—H...Cl, N—H...O and N—H...Cl hydrogen bonds via three different continuous rings with R54(12), R43(10) and R33(8) motifs. 相似文献
2.
Ping‐ping Shi Li Zhang Qiong Ye 《Acta Crystallographica. Section C, Structural Chemistry》2012,68(7):o266-o269
Mixtures of 4‐carboxypyridinium perchlorate or 4‐carboxypyridinium tetrafluoroborate and 18‐crown‐6 (1,4,7,10,13,16‐hexaoxacyclooctadecane) in ethanol and water solution yielded the title supramolecular salts, C6H6NO2+·ClO4−·C12H24O6·2H2O and C6H6NO2+·BF4−·C12H24O6·2H2O. Based on their similar crystal symmetries, unit cells and supramolecular assemblies, the salts are essentially isostructural. The asymmetric unit in each structure includes one protonated isonicotinic acid cation and one crown ether molecule, which together give a [(C6H6NO2)(18‐crown‐6)]+ supramolecular cation. N—H...O hydrogen bonds between the protonated N atoms and a single O atom of each crown ether result in the 4‐carboxypyridinium cations `perching' on the 18‐crown‐6 molecules. Further hydrogen‐bonding interactions involving the supramolecular cation and both water molecules form a one‐dimensional zigzag chain that propagates along the crystallographic c direction. O—H...O or O—H...F hydrogen bonds between one of the water molecules and the anions fix the anion positions as pendant upon this chain, without further increasing the dimensionality of the supramolecular network. 相似文献
3.
Fenghui Liu 《应用有机金属化学》2003,17(9):737-738
Thallium(18‐crown‐6) hexafluorophosphate was prepared and its structure was determined by X‐ray diffraction analysis. The Tl+ ion is surrounded by six oxygen atoms of 18‐crown‐6 and three fluorine atoms of , forming a sandwiched structure. If the three Tl–F interactions were considered significant, the coordination number in the title compound would be nine. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
4.
(Borohydrido)(18‐crown‐6)potassium and (borohydrido)(dibenzo‐18‐crown‐6)(tetrahydrofuran)potassium
Claude Villiers Michel Ephritikhine Pierre Thury 《Acta Crystallographica. Section C, Structural Chemistry》2006,62(7):m275-m277
In the two compounds (borohydrido)(1,4,7,10,13,16‐hexaoxacyclooctadecane‐κ6O)potassium, [K(BH4)(C12H24O6)], (I), and (borohydrido)(1,4,7,10,13,16‐hexaoxa‐2,3:11,12‐dibenzocyclooctadeca‐2,11‐diene‐κ6O)(tetrahydrofuran)potassium, [K(BH4)(C4H8O)(C20H24O6)], (II), the K atom is bound to the six O atoms of the crown ether and to a tridentate borohydride group, with further coordination to a tetrahydrofuran molecule in (II). The alkali metal ion environment is thus distorted hexagonal–pyramidal in (I) and bipyramidal in (II). 相似文献
5.
Pb(18‐crown‐6)Cl2 and Hg(18‐crown‐6)I2 are obtained as transparent colourless crystals of needle and hexagonal shape, respectively, by isothermal evaporation of their dichloromethane solutions. Pb(18‐crown‐6)Cl2 crystallizes with the trigonal crystal system [ , no. 148, a = b = 1176.3(2), c = 1191.8(3) pm, V = 1428.2(5) 106·pm3, Z = 3] whereas Hg(18‐crown‐6)I2 crystallizes with the orthorhombic crystal system (Pnma, no. 62, a = 1613.9(2) pm, b = 2822.2(5) pm, c = 841.3(1) pm, V = 3832(1)106·pm3, Z = 8). Both compounds are characterized by linear MX2 (HgI2 or PbCl2) molecular units which are encrypted by the crown ether. In both cases, the divalent metal ion resides in the middle of the crown ether resulting in a hexagonal bipyramidal coordination environment for the metal cations. The molecular symmetry comes close to D3d. Hg(18‐crown‐6)I2 and Pb(18‐crown‐6)Cl2 differ in the way the single MX2@18‐crown‐6 units are packed. Whereas the Hg(18‐crown‐6)I2 molecules are arranged in a (distorted) cubic closest packing, the Pb(18‐crown‐6)Cl2 molecules adopt a hexagonal closest packing. 相似文献
6.
Suchada Chantrapromma Anwar Usman Hoong‐Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(11):m531-m533
In the title compound [systematic name: triaqua(1,4,7,10,13,16‐hexaoxacyclooctadecane‐κ6O)(2‐nitrophenolato‐κO)barium(II)–aqua(1,4,7,10,13,16‐hexaoxacyclooctadecane‐κ6O)‐ bis(2‐nitrophenolato‐κ2O,O′)barium(II)–2‐nitrophenolate (1/1/1)], [Ba(C12H24O6)(C6H4NO3)(H2O)3][Ba(C12H24O6)(C6H4NO3)2(H2O)](C6H4NO3), the two BaII atoms encapsulated by the 18‐crown‐6 rings have different coordinations. Although both BaII atoms are coordinated to the six O atoms of the crowns, in the neutral moiety, the BaII atom is coordinated to one terminal O atom from a water molecule, two phenolate O atoms and two nitro‐group O atoms, while in the cationic moiety, the BaII atom is coordinated to three terminal O atoms from water molecules and one phenolate O atom. Both the crowns are eclipsed and translated along the b direction. In the asymmetric unit, the three components are interconnected by four O—H?O interactions. The packing is stabilized by two intermolecular C—H?O interactions and by one O—H?O interaction. 相似文献
7.
Anwar Usman Suchada Chantrapromma Hoong‐Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(1):m45-m47
The title compound, bis(2,4‐dinitrophenolato‐κ2O,O′)(1,4,7,10,13,16‐hexaoxadecane‐κ6O)barium(II), [Ba(C6H3N2O5)2(C12H24O6)], is a 1:1 complex of barium(II)–2,4‐dinitrophenolate and 1,4,7,10,13,16‐hexaoxacyclooctadecane (18‐crown‐6). Its structure is located on a crystallographic inversion centre. The temperature dependence of the crystal structure has been studied. The monoclinic β angle of the P21/n space group increases with increasing temperature. The packing structure of the complex is stabilized by intermolecular C—H?O interactions. 相似文献
8.
Xue Li Jian‐Min Dou Ying Liu Lan‐Ying Zhu Pei‐Ju Zheng 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(10):1185-1187
The novel PtII–dibenzo‐18‐crown‐6 (DB18C6) title complex, μ‐[tetrakis(thiocyanato‐S)platinum(II)]‐N:N′‐bis{[2,5,8,15,18,21‐hexaoxatricyclo[20.4.0.19,14]hexacosa‐1(22),9(14),10,12,23,25‐hexaene‐κ6O]potassium(I)}, [K(C20H24O6)]2[Pt(SCN)4], has been isolated and characterized by X‐ray diffraction analysis. The structure analysis shows that the complex displays a quasi‐one‐dimensional infinite chain of two [K(DB18C6)]+ complex cations and a [Pt(SCN)4]2? anion, bridged by K+?π interactions between adjacent [K(DB18C6)]+ units. 相似文献
9.
Phalguni Misra Rajesh Koner Malabika Nayak Sasankasekhar Mohanta John N. Low George Ferguson Christopher Glidewell 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(10):m440-m444
Tetraaqua(18‐crown‐6)cerium(III) hexacyanoferrate(III) dihydrate, [Ce(C12H24O6)(H2O)4][Fe(CN)6]·2H2O, and tetraaqua(18‐crown‐6)neodymium(III) hexacyanoferrate(III) dihydrate, [Nd(C12H24O6)(H2O)4][Fe(CN)6]·2H2O, are isomorphous and isostructural in the C2/c space group, where the cations, which contain ten‐coordinate lanthanoid centres, lie across twofold rotation axes and the anions lie across inversion centres. In these compounds, an extensive series of O—H...O and O—H...N hydrogen bonds links the components into a continuous three‐dimensional framework. Triaqua(18‐crown‐6)lanthanoid(III) hexacyanoferrate(III) dihydrate, [Ln(C12H24O6)(H2O)3][Fe(CN)6]·2H2O, where Ln = Sm, Eu, Gd or Tb, are all isomorphous and isostructural in the P space group, as are triaqua(18‐crown‐6)gadolinium(III) hexacyanochromate(III) dihydrate, [Gd(C12H24O6)(H2O)3][Cr(CN)6]·2H2O, and triaqua(18‐crown‐6)gadolinium(III) hexacyanocobaltate(III) dihydrate, [Gd(C12H24O6)(H2O)3][Co(CN)6]·2H2O. In these compounds, there are two independent anions, both lying across inversion centres, and the lanthanoid centres exhibit nine‐coordination; in the crystal structures, an extensive series of hydrogen bonds links the components into a three‐dimensional framework. 相似文献
10.
Xue‐qun Fu Yong‐le Yang Qiong Ye 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(8):o433-o435
In the structure of the complex of dibenzo‐18‐crown‐6 [systematic name: 2,5,8,15,18,21‐hexaoxatricyclo[20.4.0.09,14]hexacosa‐1(26),9,11,13,22,24‐hexaene] with 4‐methoxyanilinium tetrafluoroborate, C7H10NO+·BF4−·C20H24O6, the protonated 4‐methoxyanilinium (MB‐NH3+) cation forms a 1:1 supramolecular rotator–stator complex with the dibenzo‐18‐crown‐6 molecule via N—H...O hydrogen bonds. The MB‐NH3+ group is attached from the convex side of the bowl‐shaped crown, in contrast with similar ammonium cations that nest in the curvature of the bowl. The cations are associated via C—H...π interactions, while the cations and anions are linked by weak C—H...F hydrogen bonds, forming cation–crown–anion chains parallel to [011]. 相似文献
11.
Suchada Chantrapromma Anwar Usman Hoong‐Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(11):m534-m536
The molecule of the title compound {systematic name: di‐μ‐sulfido‐bis[diaqua(1,4,7,10,13,16‐hexaoxacyclooctadecane‐κ6O)barium(II)] bis[1,2‐benzisothiazol‐3(2H)‐one 1,1‐dioxide]}, [Ba2S2(C12H24O6)2(H2O)4](C7H5NO3S)2, lies on an inversion centre. The BaII atom encapsulated by the 18‐crown‐6 ring is coordinated by the six O atoms of the crown, two water O atoms and two bridging S atoms. The four‐membered ring composed of the BaII atoms and the bridging S atoms makes a dihedral angle of 67.1 (1)° with the crown‐ether ring. The aromatic ring system of the saccharin moiety is essentially planar. The packing is built up from layers of the molecules and is stabilized by three intermolecular O—H?O hydrogen bonds. 相似文献
12.
Hanna B. Szczeniak Violetta Patroniak Wanda Radecka‐Paryzek Maciej Kubicki 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(8):o371-o373
The crystal structure of the title compound, C7H24N44+·3ClO4−·Cl−, is mainly determined by electrostatic interactions between the charged species and a number of relatively weak N—H...O and N—H...Cl− hydrogen bonds. The rich structure of such hydrogen bonds creates infinite layers of ions extending along the [001] direction. The tetracation has the gttttttg conformation, similar to the single previously known example of such a cation. The presence of two different anions can be connected with the undecided competition between them, and some of the packing advantages of such a situation are found in the crystal structure. 相似文献
13.
Dianne D. Ellis Anthony L. Spek 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(5):596-597
The title crown ether, C28H40O8, crystallizes in an orthorhombic cell with the full molecule generated from crystallographic inversion symmetry. The ring consists of 30 atoms which could potentially influence the size of the ring cavity and the conformational flexibility. Unusual C—O—C—C and O—C—C—O torsion‐angle geometries, deviating by as much as 30° from their ideal values, have been observed. 相似文献
14.
Ingo Pantenburg Ingrid Müller 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(10):m427-m428
(1,4,7,10,13,16‐Hexaoxacyclooctadecane‐κ6O)potassium pentaiodide, [K(C12H24O6)]I5, obtained by slow evaporation of an ethanol solution of KI, 18‐crown‐6 and I2, contains [K(18‐crown‐6)]+ cations (Ci symmetry) and I5− anions (C2 symmetry), which are arranged in alternating layers parallel to (001). In contrast to the well known tendency of I5− ions to form chains and nets, the I5− units in the title compound are isolated. 相似文献
15.
M(benzo‐18‐crown‐6)I4 (M = Cd, Hg) are obtained as red columnar crystals from the reactions of benzo‐18‐crown‐6 (b18c6), cadmium and mercury iodide, respectively, and iodine in molar ratios of 1:1:2 in acetonitrile. They both crystallize with the orthorhombic crystal system, P212121, a = 833.7(1), b = 1610.9(1), c = 1846.8(1) pm, V = 2480.3(1) 106·pm3, Z = 4, for M = Cd and a = 823.4(1), b = 1616.5(1), c = 1866.1(1) pm, V = 2483.8(2) 106·pm3 for M = Hg. The crystal structures consist of [M(b18c6)]I2 molecules which are connected to a slightly lengthened iodine molecule via a secondary contact, according to the formulation I2@[MI2@(b18c6)]. 相似文献
16.
Recrystallization of Ln(NO3)3 (Ln = Sm, Eu, Yb) in the presence of 18‐crown‐6 under aqueous conditions yielded [Ln(NO3)3(H2O)3] · 18‐crown‐6. X‐ray crystallography revealed isomorphous structures for each of the lanthanide complexes where [Ln(NO3)3(H2O)3] is involved in hydrogen bonding interactions with 18‐crown‐6. The transition point where the structural motif changes from [Ln(18‐crown‐6)(NO3)3] (with the metal residing in the crown cavity) to [Ln(NO3)3(H2O)3] · 18‐crown‐6 has been identified as at the Nd/Sm interface. A similar investigation involving [Ln(tos)3(H2O)6] (tos = p‐toluenesulfonate) and 18‐crown‐6 were resistant to crown incorporation. X‐ray studies show extensive intra‐ and intermolecular hydrogen bonding is present. 相似文献
17.
Ryuji Nonokawa Eiji Yashima 《Journal of polymer science. Part A, Polymer chemistry》2003,41(7):1004-1013
A stereoregular poly(phenylacetylene) bearing the bulky aza‐18‐crown‐6 ether as the pendant (poly‐ 1 ) formed a predominantly one‐handed helical conformation upon complexation with various chiral compounds, such as amino acids, peptides, aminosugars, amines, and amino alcohols in water. The complexes exhibited an induced circular dichroism (ICD) in the UV–visible region of the polymer main chain. Therefore, poly‐ 1 can be used as a novel probe for determining the chirality of chiral compounds in water. The assay of 19 common free L ‐amino acids gave the same ICD sign at 0 °C except for L ‐phenylalanine. The effects of pH, temperature, guest concentration, and organic solvent content on the ICD during the complexation of poly‐ 1 with chiral compounds were also investigated. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 1004–1013, 2003 相似文献
18.
Vira V. Ponomarova Konstantin V. Domasevitch 《Acta Crystallographica. Section C, Structural Chemistry》2012,68(9):o359-o361
In the title compound, 2C9H6N2O2·C12H24O6·4H2O, the 18‐crown‐6 (1,4,7,10,13,16‐hexaoxacyclooctadecane) molecule resides across a centre of inversion. The adduct exists as a molecular hydrogen‐bonded complex featuring integration of two kinds of synthons, viz. [(18‐crown‐6)(H2O)4] [O...O = 2.8645 (18)–2.9014 (18) Å] and an oxime/aqua ensemble, PhC(O)C(CN)NOH...OH2 [O...O = 2.5930 (18) Å]. The reliability of the oxime/aqua motif, sustained by the highly acidic cyanooxime, is an essential factor in the construction of multicomponent cocrystals and the accommodation of oxime species in macrocyclic hosts. The supramolecular structure is generated by the alternation of hydrophilic [(18‐crown‐6)(H2O)4] layers and bilayers of benzoyl(hydroxyimino)acetonitrile molecules, resulting in stacking interactions between the phenyl and cyano groups of 3.666 (2) Å. 相似文献
19.
Lee A. Gerrard Mark T. Weller 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(10):m504-m505
Cocrystallization of the inorganic [BeF4]2? unit with the organic moiety [NH3CH2CH(NH3)CH3]2+ results in the three‐dimensional network of the title compound, (C3H12N2)[BeF4] or C3H12N22+·BeF42?, created by hydrogen bonds between the protonated ammonium groups and the highly electronegative F atoms of the anion. The structure is described in terms of layers related to each other by crystallographic centres of symmetry. 相似文献
20.
Thomas J. Otto Kraig A. Wheeler 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(6):704-705
The title compound, poly[[aquazinc(II)]‐μ‐benzene‐1,3‐dicarboxylato‐O1:O1′:O2], [Zn(C8H4O4)(H2O)]n, forms a metal–organic coordination network that consists of tetrahedral Zn atoms bonded to one water molecule and three carboxylate groups. Isophthalate groups bridge the four‐coordinate Zn centers to generate two‐dimensional architectures in the ac plane. These planar zinc isophthalate motifs are linked by infinite C=O?H—O—H interactions along the a axis to form a chiral framework. The observed polar structural pattern originates due to the distorted tetrahedral Zn centers [O—Zn—O 100.7 (2)–136.0 (1)°] and the alignment of the water molecules. Bridging isophthalate groups align to form approximate centrosymmetric motifs. 相似文献