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Let f:C→Ĉ be a function which is either transcendental meromorphic or rational with degree at least 2. We discuss the uniform perfectness of the attracting or parabolic cycle of stable domains of f(z), and include a proof that the Julia set of a meromorphic function of finite type is uniformly perfect. 2000 Mathematics Subject Classification 37F10, 37F50, 30D05. [ABSTRACT FROM AUTHOR]

The molecular structures of ethyl 5-amino-3-(4,6-dimethylpyrimidin-2-ylamino)-1-methyl-1H-pyrazole-4-carboxylate, C13H18N6O2, (I), and ethyl 5-amino-3-(4,6-dimethylpyrimidin-2-ylamino)-1-(2-nitrophenylsulfonyl)-1H-pyrazole-4-carboxylate, C18H19N7O6S, (II), have been determined. There are two intramolecular N—H…O bonds and one intermolecular N—H…O hydrogen bond in (I). The rings formed by the N—H…O hydrogen bonds are almost planar. In (II), three intramolecular N—H…O hydrogen bonds exist. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound, C21H19N3OS, there are inter­molecular C—H⋯O hydrogen bonds. No π–π stacking inter­actions are observed. [ABSTRACT FROM AUTHOR]

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 crystal structure of the title compound, C22H21N3O2, the packing of the mol­ecules is mainly governed by inter­molecular C—H⋯O hydrogen bonds and π–π inter­actions. [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, C18H25N3O2S, the central thienopyrimidine ring system is essentially planar. The cyclohexene ring, in which the four CH2 groups are disordered in an approximately 1:1 ratio, adopts a half-chair conformation, while the morpholine ring is in a standard chair conformation. The butyl group is disordered in an approximately 2:1 ratio. In the crystal structure, weak intermolecular C—H⋯O hydrogen-bonding interactions stabilize the crystal structure. [ABSTRACT FROM AUTHOR]

The molecule of the title compound, C22H14Cl2O, is built up from three fused rings, two six-membered and one fivemembered, which are coplanar to within 0.015 (3) Å. The dihedral angles between the fluorene ring plane and the benzene and oxirane rings are 58.83 (13) and 55.99 (34)°, respectively. C—H⋯O hydrogen bonds link the molecules into sheets running parallel to the (010) plane. The crystal studied was an inversion twin. [ABSTRACT FROM AUTHOR]

The title dysprosium coordination polymer [Dy(IN)3(H2O)2] n, where IN− is the isonicotinate anion C6H4NO2−, has been hydro­thermally synthesized. The polymer exhibits a doubly carboxyl­ate-bridged infinite chain-like structure with the metal center lying on a crystallographic twofold axis and coordinating by two carboxyl­ate O atoms from a chelating isonicotinate group (also lying on a twofold axis), four carboxyl­ate O atoms from four bridging isonicotinate ligands, and two water mol­ecules, to yield an eight-coordinate square-anti­prismatic geometry. [ABSTRACT FROM AUTHOR]

In the title compound, C21H21N3OS, the three fused rings of the 1-benzothieno[3,2- d]pyrimidine system are almost coplanar. The crystal packing is stabilized by π–π stacking inter­actions and inter­molecular C—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, C17H21Cl2NO2, a cyclo­propane derivative related to the insecticide cyclo­prothrin, was prepared from piperidine and 2,2-dichloro-1-(4-ethoxy­phen­yl)cyclo­propane­carbonyl chloride. The six-membered piperidine ring has a chair conformation. The orientation of the carbonyl group relative to the cyclo­propane ring may be described by the torsion angle X—C—C=O of −98.3°, where X is the centroid of the cyclo­propane ring. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound, C21H20N2O3, mol­ecules are stacked through inter­molecular π–π inter­actions. No significant hydrogen bonds are observed. [ABSTRACT FROM AUTHOR]

In the title compound, C19H27N3OS, the central thienopyrimidine ring system is essentially planar. The cyclohexene ring adopts a half-chair conformation, while the piperidine ring is in a standard chair conformation. There is an intramolecular C—H...O hydrogen bond, which stabilizes the molecular structure. The crystal packing is stabilized by C—H...π interactions. [ABSTRACT FROM AUTHOR]

In the crystal structure of the title compound, C20H20N2O4, the mol­ecules are linked by a weak inter­molecular C—H⋯N hydrogen bond. The molecule has crystallographic twofold rotation symmetry. [ABSTRACT FROM AUTHOR]

The title compound, C16H15F3N2O3, is composed of a 3-(tri­fluoro­methyl)­phenyl ring and a pyridazinone ring, which are approximately coplanar, and an ethyl acetate group on the pyridazinone ring. In the crystal structure, centrosymmetric­ally related mol­ecules form dimers through non-classical intermolecular C—H⋯O hydrogen bonds. [ABSTRACT FROM AUTHOR]

The tetra­hydro­pyrimidine ring of the title mol­ecule, C12H14N2OS, adopts a half-chair conformation. In the crystal structure, the mol­ecules are linked to form centrosymmetric­ally related hydrogen-bonded dimers. [ABSTRACT FROM AUTHOR]