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The title compound, C16H19NO5, which was synthesized from p-meth­oxy­cinnamic acid, has intra­molecular O—H...O and N—H...O hydrogen-bonding inter­actions. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds and aromatic π–π stacking inter­actions [minimum ring centroid–centroid separation = 3.790 (1) Å].

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In the title compound, {[Ho2(C6H4NO3)2(C2O4)2(H2O)2]·2H2O}n, the HoIII atom is coordinated by three O atoms from three 5-hy­droxy­nicotinate ligands, four O atoms from two oxalate ligands, each lying on an inversion center, and one water mol­ecule in a distorted square-anti­prismatic geometry. The 5-hy­droxy­nicotinate ligand is protonated at the N atom and deprotonated at the hy­droxy group. The HoIII atoms are bridged by the carboxyl­ate and phenolate O atoms, forming a three-dimensional framework. N—H...O and O—H...O hydrogen bonds, as well as π–π inter­actions between the pyridine rings [centroid–centroid distance = 3.794 (2) Å], are observed.

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The title compound, C51H78N4O12, is a derivative of rapamycin, a triene macrolide anti­biotic mol­ecule isolated from Streptomyces hygroscopicus. The macrocyclic ring structure has 15 chiral centres, with one of the substituent hy­droxy groups giving an intra­molecular hydrogen bond to a ketone O-atom acceptor. The mol­ecules also form inter­molecular hy­droxy–ketone O—H...O hydrogen-bonding associations, giving one-dimensional chains extending along (010). The crystal has 108 Å3 solvent-accessible voids.
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