12 research outputs found
2,9,16,19,22,25-Hexaoxatetracyclo[24.4.0.24,7.010,15]dotriaconta-1(26),4,6,10(15),11,13,27,29,31-nonaene
The title 22-crown-6 unit, C26H28O6, comprising of three benzo groups and triethylene glycol, was prepared by the reaction of α,α′-dibromo-p-xylene with 1,8-bis(2-hydroxyphenoxy)-3,6-dioxaoctane in the presence of Cs2CO3 with tetrahydrofuran (THF) and recrystallized from dichloromethane–hexane (1:20 v/v) at room temperature. In the molecular structure, two O atoms of the central ethylene glycol in the triethylene glycol unit exhibit exo conformations due to intramolecular C—H⋯O interactions. A number of C—H⋯O and C—H⋯π intermolecular interactions contribute to the stabilization of the crystal packing
6,7-Bis(bromomethyl)-2,11,18,21,24,27-hexaoxatetracyclo[26.4.0.04,9.012,17]dotriaconta-1(28),4,6,8,12(17),13,15,29,31-nonaene dichloromethane monosolvate
The title 20-crown-6 unit, C28H30Br2O6·CH2Cl2, consisting of three benzo groups and triethylene glycol was prepared from the reaction of 1,2,4,5-tetrakis(bromomethyl)benzene and bisphenol in the presence of sodium hydride. In the crystal, one O atom of the central ethylene glycol in the triethylene glycol unit exhibits an exo conformation as a result of intramolecular C—H⋯O hydrogen bonds. The crown unit and the solvent molecule are linked by weak C—H⋯O hydrogen bonds
2,9,12,15,18,25,27,34,37,40,43,50-Dodecaoxa-56-azaheptacyclo[24.24.5.151,55.03,8.019,24.028,33.044,49]hexapentaconta-3,5,7,19(24),20,22,28(33),29,31,44,46,48,51,53,55-pentadecaene
The title compound, C43H45NO12, was prepared from the reaction of 2,6-bis(dibromomethyl)pyridine and bisphenol in the presence of caesium carbonate as a base. The central ring makes dihedral angles of 64.83 (6), 13.48 (6), 56.96 (6) and 66.21 (6)° with the peripheral rings. In the crystal, molecules are linked by weak C—H...O and C—H...π interactions, forming a folded structure
9-[3-(Carbazol-9-yl)-5-methylphenyl]carbazole
The title compound, C31H22N2, crystallizes with two symmetry-independent molecules in the asymmetric unit. The molecules have slightly different conformations, the dihedral angles between the central phenyl ring and the carbazolyl groups being 56.29 (4) and 59.57 (4)° in one molecule and 48.71 (4) and 65.47 (4)° in the other. In the crystal, molecules are linked by weak C—H...π and π–π [centroid–centroid distances = 3.7698 (10), 3.8292 (9), 3.9429 (10) and 3.9431 (10) Å]
25,27-(3,6,9-Trioxaundecane-1,11-dioxy)-26,28-{3-[4-(tricyanoethylene)phenyl]-3-azapentane-1,5-dioxy}calix[4]arene dichloromethane monosolvate
The title compound, C51H48N2O7, was synthesized by the reaction of 25,27-(3,6,9-trioxaundecane-1,11-dioxy)-26,28-(3-phenyl)-3-azapentane-1,5-dioxy)calix[4]arene with tetracyanoethylene in dry DMF. The compound has a 1,3-alternate conformation with an oxo-crown-5 unit and an aza-crown-3 unit with a nitrogen atom connecting tricyanoethylenephenyl group as a chromophore. Pairs of benzene rings of the calixarene are facing one another. Three of the four oxygen atoms connected to a benzene have endo-conformations while the other is exo. The oxo-crown-5 system has a t–g–g–t conformation. The dichloromethane solvent molecule is linked to the main molecule by a C—H...Cl hydrogen bond. In the crystal, C—H...O, C—H...Cl hydrogen bonds and C—H...π(ring) interactions are observed
2,8,15,18,21,24,31,37,44,47,50,53-Dodecaoxaheptacyclo[52.4.0.04,35.06,33.09,14.025,30.038,43]octapentaconta-1(54),4,6(33),9(14),10,12,25(30),26,28,34,38(43),39,41,55,57-pentadecaene dichloromethane disolvate
In the title compound, C46H50O12·2CH2Cl2, each dual 20-crown-6 unit crystallizes with two dichloromethane solvent molecules. The crown unit molecule lies about an inversion centre located at the central benzene ring. The two crown ring groups adopt an anti conformation, stabilized by weak intramolecular C—H...O interactions. In the crystal, the crown unit molecules and the solvent molecules are linked by C—H...O interactions into a three-dimensional network
5,31-Diaza-2,8,15,18,21,28,34,41,44,47-decaoxaheptacyclo[46.4.0.04,32.06,30.09,14.022,27.035,40]dopentaconta-1(48),4,6(30),9(14),10,12,22(27),23,25,31,35(40),36,38,49,51-pentadecaene monohydrate
In the title compound, C40H40N2O10·H2O, each dual 17-crown-5 unit crystallizes with one solvent water molecule. The crown units are connected by a pyrazine ring. One oxo group in a crown moiety is disordered over two sites, with a refined occupancy ratio close to 1:1. The water molecule is linked to the crown unit by bifurcated O—H...O hydrogen bonds. In the crystal, molecules are linked by weak C—H...N and C—H...O interactions for the packing