In the crystal of the title compound, C(24)H(22)NO(2) (+)·CF(3)SO(3) (-), adjacent cations and anions are connected through C-H⋯O, C-H⋯F and S-O⋯π inter-actions, while neighboring cations via π-π inter-actions [centroid-centroid distance = 3.962 (2) Å]. The acridine and benzene ring systems are oriented at a dihedral angle of 14.6 (1)°. The carboxyl group is twisted at an angle of 87.6 (1)° rel...

In the title structure, C(7)H(9)N(3)O(2)·H(2)O, there are two formula units in the asymmetric unit. The mol-ecule is a zwitterion, containing a quaternary N atom and a deprotonated carboxyl group, with C-O distances in the range 1.256 (2)-1.266 (3) Å. The two independent mol-ecules form a hydrogen-bonded R(2) (2)(16) dimer about an approximate inversion center via N-H⋯O hydrogen bonds, with N⋯O...

In the crystal structure of the title compound, C(22)H(18)NO(2) (+)·CF(3)SO(3) (-), adjacent cations are linked through C-H⋯π and π-π inter-actions, and the cations and anions are connected by C-H⋯O and C-F⋯π inter-actions. The acridine and benzene ring systems are oriented at a dihedral angle of 3.0 (1)°. The carboxyl group is twisted at an angle of 83.1 (1)° relative to the acridine skeleton....

We describe a process for defining and computing a fundamental domain in the upper half plane H of a Shimura curve X 0 (N) associated to an order in a quaternion algebra A/Q. A fundamental domain for X 0 (N) realizes a finite presentation of the quaternion unit group, modulo units of its center. We give explicit examples of domains for the curves X 0 (1), X 0 (1), and X 35 0 (1). The first exam...

The Effect of Teaching Approaches on Preschoolers’ Social Skills N. Mohammadi, Ph.D. M. Mesteri Social skills can be better fostered by teaching approaches that emphasize group work. Such skills include self-control, academic self-efficacy, persistence, leadership skills, and social communication. Teaching approaches also include work unit and project approaches. To explore ...

The mol-ecule of the title compound, C(17)H(13)NO(2), is nearly planar, the r.m.s. deviation for all non-H atoms excluding the two methyl C atoms being 0.089 Å. Inter-molecular N-H⋯O and C-H⋯O hydrogen bonds are found in the crystal structure. C-H⋯π inter-actions are also found. The H atoms of the methyl group attached to the benzene ring are disordered equally over two positions.

In the title compound, C(23)H(20)NO(2) (+)·CF(3)SO(3) (-), the acridine ring system is oriented at a dihedral angle of 23.1 (1)° with respect to the benzene ring and the carboxyl group is twisted at an angle of 74.1 (1)° relative to the acridine skeleton. In the crystal, adjacent cations are linked through C-H⋯π inter-actions and neighboring cations and anions via weak C-H⋯O hydrogen bonds. The...

Shared service centers (SSCs) are an increasingly important and oft-utilized approach to organizing Information Technology services. Nevertheless, researchers hitherto have not investigated SSCs sufficiently. Our research attempts to fill this gap by addressing the following basic problems: Firstly, no standardized definition of SSCs has established; and, secondly, different features of SSCs in...