Ethyl 4-(2-fur­yl)-2-oxochroman-3-carboxyl­ate

The title compound, C16H14O5, was prepared from the reaction of 3-carbethoxy­coumarin with furan in the presence of AlCl3 as catalyst. In the crystal, inter­molecular C—H⋯O hydrogen-bonding inter­actions between four mol­ecules lead to a tetra­mer in the unit cell. The furan ring is anti­periplanar [C—C—C—O = 167.9 (13)°] and the ethoxy­carbonyl group is (−)anti­clinal [C—C—C—O = −128.6 (14)°] to the lactone ring

Self-assembly of a fluorescent chiral zinc (II) complex that leads to supramolecular helices

The chiral Zn(II) complex [ZnLCl2], 1 {L = 4-methyl-2,6-di[(S)-(+)-1-phenylethyliminomethyl] phenol}, self-assembles via C-H···Cl hydrogen bonding into supramolecular helices. Complex 1 exhibits emission in solution at room temperature in the visible range. Crystal data for 1: orthorhombic space group P212121, α = 9.614(2) Å, b = 13.825(3) Å, c = 18.667(3) Å, V = 2481.1(8) Å3, Z = 4

Water-chloride interactions: left- and right-handed aqua-chloro supramolecular helices anchored by a chiral Schiff-base nickel complex

Both left- and right-handed supramolecular aqua-chloro helices, formed by hydrogen bonding interactions, are anchored by a new chiral Schiff-base nickel complex [NiL] in the compound [NiL] · 2HCl · 7H<SUB>2</SUB>O (1) (see scheme 1 for L); The asymmetric unit in the crystal structure of compound 1 contains fourteen non-coordinated water molecules and four hydrochloric acid molecules. All water molecules and chloride anions, present in the crystal lattice of 1, are exclusively involved in hydrogen bonding interactions