1,5-Bis(2-formyl­phen­oxy)-3-oxapenta­ne

In the title mol­ecule, C18H18O5, the two aromatic rings are connected by a flexible 3-oxapentane chain. The mol­ecule has a crystallographic twofold rotation axis (C 2) passing through the central O atom. An intra­molecular C—H⋯O hydrogen bond is observed in the solid state

Potassium trifluoro­[(Z)-3-methoxy­prop-1-en­yl]borate

In the title salt, K+·C4H7BF3O−, the K atom is surrounded by six anions making close contacts through seven F [K⋯F = 2.779 (1)–3.048 (1) Å] and two O [K⋯O = 2.953 (2) and 3.127 (2) Å] atoms in a trivacant fac-vIC-9 icosa­hedral coordination geometry

cis-Bis{1-[(4-nitro­phen­yl)diazen­yl]-2-naphtholato}dipyridine­nickel(II)1

In the title compound, [Ni(C16H10N3O3)2(C5H5N)2], the NiII cation is in a distorted octa­hedral NiN4O2 coordination by two independent bidentate 1-[(4-nitro­phen­yl)diazen­yl]-2-naph­thol­ate anions and two pyridine ligands. C—H⋯O inter­actions between aromatic rings and the O atoms of the nitro substituents build up a two-dimensional supra­molecular arrangement parallel to (100)

Potassium trifluoro­[(Z)-3-(oxan-2-yl­oxy)prop-1-en-1-yl]borate monohydrate

The title compound, K+·C8H13BF3O2 −·H2O, which was obtained from the reaction of a modified form of Z-vinylic telluride via a transmetalation reaction with n-BuLi, crystallizes as K+ and C8H13BF3O2 − ions along with a water mol­ecule. The K+ cation is surrounded by four anions, making close contacts with six F atoms at 2.659 (3)–2.906 (3) Å and with two O atoms at 2.806 (3) and 2.921 (3) Å in a distorted bicapped trigonal-prismatic geometry

cis-Bis{(E)-2-[(2-fluorophenyl)iminomethyl]phenolato-κ2N,O}bis(pyridine-κN)nickel(II)In memoriam Professor Jairo Bordinhão.

The structure of the title compound, [Ni(C13H9FNO)2(C5H5N)2], consists of an NiII atom on a crystallographic center of symmetry, octahedrally bonded through both the N and O atoms to two 2-[(2-fluorophenyl)iminomethyl]phenolate (L) ligands, as well as two pyridine ligands. The F atoms of L are disordered over two positions related by a 180° rotation of the fluorophenyl group around its external C—N bond