5,5-Dimethyl-2,2-di(pyridin-2-yl)hexahydropyrimidine

Strömgren photometry in globular clusters : M 55 & M 22 ⋆

We present Strömgren CCD photometry for the two galactic globular clusters M55 (NGC 6809) and M22 (NGC 6656). We find average Strömgren metallicities of −1.71±0.04 dex for M55 and −1.62 ± 0.08 dex for M22. The determination of metal abundances in cluster giants with the Strömgren m1 index in comparison with spectroscopic data from Briley et al. (1993) and Norris & Freeman (1982, 1983) shows tha...

Bis(dipyridin-2-yl­amine-κ2 N 2,N 2′)palladium(II) dinitrate

The asymmetric unit of the title compound, [Pd(C(10)H(9)N(3))(2)](NO(3))(2), contains one half of a cationic Pd(II) complex and one NO(3) (-) anion. In the complex, the Pd(II) ion is four-coordinated by four pyridine N atoms derived from the two chelating dipyridin-2-yl-amine (dpa) ligands. The Pd(II) atom is located on an inversion centre, and thus the PdN(4) unit is exactly planar. The dpa li...

Application Note 55 AN 55 - 2 TUBE CURRENT

Dimethyl 2-(2-quinolylmeth­yl)malonate

In the title compound, C(15)H(15)NO(4), the quinoline ring system and one of the malonate side chains are essentially coplanar (r.m.s. deviation = 0.0297 Å). The two malonate C-C(=O)-O-CH(3) side chains are oriented at right angles [89.68 (8)°] with respect to each other. The crystal packing is stabilized by weak non-classical inter-molecular C-H⋯O hydrogen bonds, which link the mol-ecules into...

Dimethyl 2-(methyl­amino­methyl­ene)malonate

In the title compound, C(7)H(11)NO(4), which is an example of a push-pull alkene, a network of N-H⋯O and C-H⋯O inter-actions helps to establish the crystal structure. The investigated crystal turned out to be a non-merohedral twin with a ratio of twin components of 0.442 (3):0.558 (3). Two pairs of independent mol-ecules (Z' = 4) are linked by inter-molecular N-H⋯O hydrogen bonds, forming indep...