In the title compound, C16H15BrN2O4, the six-membered carbocyclic ring of the chromene moiety adopts an envelope conformation with the disordered methyl­ene C atom as the flap. The pyran ring is almost orthogonal to the chloro­phenyl ring, making a dihedral angle of 87.11 (12)°. The amine-group N atom deviates significantly from the pyran ring [0.238 (3) Å]. The mol­ecular structure is stabilized by an intra­molecular N—H⋯O hydrogen bond, which generates an S(6) ring motif. In the crystal, mol­ecules are linked via C—H⋯O hydrogen bonds, which generate C(8) chains running parallel to the b axis. The chains are linked by C—H⋯π inter­actions. The methyl­ene-group C atom of the chromene system that is disordered, along with its attached H atoms and the H atoms on the two adjacent C atoms, has an occupancy ratio of 0.791 (7):0.209 (7).

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In both title pyridine derivatives, (I) and (II), the cation adopts an E configuration with respect to the C=C. In compound (I), the PF6 − anion is disordered with occupancy factors of 0.614 (7):0.386 (7). In both the compounds, the crystal packing is stabilized by C—H⋯F inter­molecular inter­actions results into two-dimensional mol­ecular sheets, which are formed by (14) ring motifs in compound (I), (40) ring motifs in compound (II). In addition to that, the crystal packing is further stabilized by P—F⋯π inter­actions in compound (I) and π–π in compound (II).

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AuszugDie Kristallstrukturen von drei Additionsverbindungen von Glycin, (NH 3 CH 2 COO) 2 BaCl 2 · H 2 0, (NH 3 CH 2 COO)2SrCl2 · 3H 2 0, (NH 3 CH 2 COO) 2 Mna 2 wurden bestimmt und bis zu R = 0,034, 0,058 und 0,074 verfeinert. Die Verbindungen mit Ba und Sr sind rhombisch; sie haben die Gitterkonstanten α = 8,31, 6 = 14,84, c = 9,32 Ä bzw. α = 16,42, b = 9,35, c = 8,26 Ä; in beiden Fällen ist Ζ = 4, Raumgruppe Pbcn. Die Mn-Verbindung ist triklin, α = 4,97, b = 7,92, c = 6,98 Ä, α = 107,4°, β = 115,9°, γ = 87,0°, Ζ = 1, Raumgruppe Pl. Das Glycin-Molekül ist, mit Ausnahme des Ν-Atoms, nahezu eben; dieses Atom weicht von der Molekülebene um 0,145, 0,113 bzw. 0,677 Ä (bei der Ba-, Sr-bzw. Mn-Verbindung) ab. Die Bindung C(2)-Ν ist gegenüber der Bindung C(l)-O(l) um 5,8°, 6,7° bzw. 29,2° um die Gerade C(l)-C(2) gedreht. N-, CT-und die Wasser-Sauerstoff-Atome sind an Wasserstoffbindungen beteiligt, aber in den Verbindungen mit Ba-und Sr ist nur ein Carboxyl-Sauerstoffatom Acceptor; in der Mn-Verbindung sind beide Carboxyl-Sauerstoffatome Acceptoren.Die Mittelwerte der Bindungen Ν···0, N---C1, O-Cl und 0---0 sind 2,86, 3,21, 3,23 bzw. 2,84 Ä. Die Koordinationszahl des Metallatoms ist in den Verbindungen mit Ba und Sr neun, in der Mn-Verbindung sechs. Das CT-Atom gehört nur bei den Ba-und Mn-Verbindungen zur Umgebung des Metallatoms. Die Koordinationspolyeder um Ba und Sr können als stark deformierte Prismen beschrieben werden; Die Umgebung von Mn ist oktaedrisch. Die Glycinreste bilden viergliedrige Chelatringe um Ba und Sr. AbstractThe crystal structure of three addition compounds of glycine, viz., bisglycine barium(II) dichloride monohydrate, (NH 3 +CH 2 COO-) 2 Ba ++ Cl 2 -· H 2 0; bisglycine strontium(II) dichloride trihydrate, (NH 3 +CH 2 COO-) 2 Sr++Cl 2 -· 3H a O;and bisglycine manganese(II) dichloride, (NH 3 + CH2COO~)2Mn + +Cl 2 _ , hereafter Structure analyses of some addition compounds of glycine 53 refered as GlycBa, GlycSr and GlycMn, respectively, were solved by singlecrystal x-ray diffraction methods and refined to R values of 0.034, 0.058 and 0.074, respectively, using visually estimated and counter measured intensity data. GlycBa and GlycSr crystallize in the orthorhombic system of space group Pbcn, with four formula units per unit cell of dimensions a = 8.31, b = 14.84 and c = 9.32 Ä; and a = 16.42, b = 9.35 and c = 8.26 A, respectively, and GlycMn crystallizes in the triclinic system of space group Ρ I, with one formula unit per unit cell of dimensions a = 4.97, b = 7.92 and c = 6.98 A, a = 107.4, β = 115.9 and y = 87.0°. The glycine molecule is almost planar except for the nitrogen atom, which deviates by 0.145, 0.113 and 0.677 A. The conformation of the glycine molecule is synplanar with conformation angle of 5.8, 6.7 and 29.2° and the molecule exists in zwitterion configuration in these structures. Nitrogen, chlorine and water-oxygen atoms take part in the hydrogen-bond formation and only one of the carboxyl-oxygen atoms is acceptor of an hydrogen bond in GlycBa and GlycSr whereas both the carbox...