OBJECTIVE To compare the performance and postoperative sensitivity of a posterior resin composite with that of bonded amalgam in 40 (n = 20) large sized cavities and to evaluate whether resin composite could be an alternative for bonded amalgam. MATERIALS AND METHODS This was a randomized clinical trial. Twenty patients in need of at least two posterior restorations were recruited. Authors ra...

A new polymorph of N,N'-bis-(2,6-diisopropyl-phen-yl)formamidine, C(25)H(36)N(2), is reported, which is different from the previously reported ortho-rhom-bic structure. The mol-ecule crystallizes in the E-anti configuration, with tautomeric disorder of the N-bonded H atoms and no clear distinction between imine and amine functionalities. The mol-ecules form hydrogen-bonded dimers with inter-mol...

In the title compound, C16H15N3O3S2, the hydrazide N atom bonded to the C=O group is planar, whereas that bonded to the SO2 group is pyramidally coordinated. The inter-planar angle between the ring systems is 40.71 (3)°. Mol-ecules are connected into ribbons parallel to the b axis by two classical hydrogen bonds N-H⋯O=C and N-H⋯Nthia-zole.

The crystal of the title compound, C(6)H(9)N(3)·C(7)H(6)O(2), contains tetra-meric hydrogen-bonded units comprising a central pair of 2-amino-pyrimidine mol-ecules linked across a centre of inversion by N-H⋯N hydrogen bonds and two pendant benzoic acid mol-ecules attached through N-H⋯O and O-H⋯N hydrogen bonds. These hydrogen-bonded units are arranged into layers in (002).

In the title compound, [Cd(NCS)(2)(C(7)H(7)NO)](n), the Cd(2+) ion is six-coordinated by one N,O-bidentate 1-(2-pyridyletahanone ligand, two N-bonded thio-cyanate ions and two S-bonded thio-cyanate ions. In the resulting distorted CdOS(2)N(3) octa-hedron, the N atoms adopt a fac arrangement. The bridging thio-cyanate ions lead to infinite sheets oriented parallel to (101) in the crystal structure.

THE CRYSTAL OF THE TITLE COMPOUND [SYSTEMATIC NAME: 4-(benzyl-amino)-benzene-sulfonamide], C(13)H(14)N(2)O(2)S, displays a hydrogen-bonded framework structure. Mol-ecules are doubly N-H⋯O hydrogen bonded to one another via their NH(2) groups and sulfonyl O atoms. These inter-actions generate a hydrogen-bonded ladder structure parallel to the a axis, which contains fused R(2) (2)(8) rings. The N...

Novel supramolecular side-chain banana-shaped liquid crystalline (LC) polymer complexes AmBn-N bearing various (m/n) molar ratios of hydrogenand covalent-bonded bent-core components were acquired by the free radical polymerization, where the hydrogen-bonded (H-bonded) structures were executed via mixing equimolar portions of proton donor (H-donor) polymers AmBn (homopolymers/ copolymers) and py...

In the crystal structure of the title compound, {(C(12)H(14)N(2))[Fe(NCS)(4)]}(n), the iron(II) cation is coordinated by four N-bonded and two S-bonded thio-cyanate anions in a distorted octa-hedral coordination mode. The asymmetric unit consists of half an iron(II) cation and half a protonated (E)-4,4'-(ethane-1,2-di-yl)dipyridinium dication, each located on a centre of inversion. In addition,...