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The two isomorphous lanthanide coordination polymers, {[Ln2(C6H4NO2)2(C8H4O4)(OH)2(H2O)]·H2O} n (Ln = Er and Tm), contain two crystallographically independent Ln ions which are both eight-coordinated by O atoms, but with quite different coordination environments. In both crystal structures, adjacent Ln atoms are bridged by μ3-OH groups and carboxylate groups of isonicotinate and benzene-1,2-dicarboxylate ligands, forming infinite chains in which the Er...Er and Tm...Tm distances are in the ranges 3.622 (3)–3.894 (4) and 3.599 (7)–3.873 (1) Å, respectively. Adjacent chains are further connected through hydrogen bonds and π–π interactions into a three-dimensional supramolecular framework. [ABSTRACT FROM AUTHOR]

In the title compound, C16H13F2NO3, the two benzene rings and all attached non-H atoms are indivdually planar. The two planes, viz. the benzene ring and the two substituent F atoms (A), and the benzene ring and the attached carbonyl C atom, oxy O atom and aromatic C atom (B), have largest deviations of -0.0278 (10) and 0.0272 (9) Å, respectively, and a dihedral angle between the planes of 37.78 (3)°. The dihedral angles between plane B and the methylaminocarbonyl and acetoxy groups are 61.83 (5) and 48.82 (8)°, respectively. [ABSTRACT FROM AUTHOR]

In the title molecule, C18H18ClN5O2, the central pyrazole ring is perpendicular to the benzene ring and approximately perpendicular to the pyridazine ring [dihedral angles 89.9 (2) and 82.8 (2)°, respectively]. [ABSTRACT FROM AUTHOR]

The title mol­ecule, C11H9FN2O, was synthesized from 3,6-difluoro­pyridazine, benz­yl alcohol and sodium hydro­xide in CH3CN under reflux. The asymmetric unit contains two independent mol­ecules with nearly identical geometry. In the crystal structure, the mol­ecules are linked by weak inter­molecular C—H⋯F hydrogen bonds and C—H⋯π inter­actions. [ABSTRACT FROM AUTHOR]

In the title compound, C18H18ClN5O2, there are two independent mol­ecules in the asymmetric unit. In both mol­ecules, the pyrimidine ring is almost coplanar with the central pyrazole ring, while the benzene ring is almost perpendicular to it. [ABSTRACT FROM AUTHOR]