Izabela Pospieszna-Markiewicz

New supramolecular dinuclear rare earth Schiff base podates

Abstract The metal-promoted reactions between 2,6-diacetylpyridine and 4-methyl-1,2-phenylenediamine, 3-azaoctane-1,8-diamine (spermidine) or N,N′-bis(2-aminoethyl)-1,3-propanediamine in the presence of lanthanide(III) ions acting as template agents afford new supramolecular dinuclear complexes of podate type with terminal acetylpyridyl groups and N4O2, N5O2 or N6O2 set of donor atoms as a result of [2+1] Schiff base condensation. The complexes were characterized by spectral data (IR, 1 H NMR, FAB-MS), thermogravimetric and elemental analysis.

The Template Synthesis of the New Macrocyclic and Acyclic Metal Ion Complexes Derived from Putrescine

The template reaction of 2,6-diacetylpyridine with biogenic diamine–putrescine in the presence of cadmium(II), mercury(II) or lead(II) ions produces the complexes of 22-membered macrocyclic ligand L1 with an N6 set of donor atoms as a result of [2 + 2] Schiff base cyclocondensation. The lead(II) complex containing Schiff base acyclic ligand L2 terminated by one carbonyl and one amine group as product of the partial [2 + 2] condensation has been also isolated and might be regarded as possible intermediate in the formation of the macrocyclic L1 complex. Analogous reaction involving the uranyl nitrate generates the complex containing the same Schiff base acyclic ligand L2 as a final product of template reaction. The complexes were characterized by spectral data (IR, 1H NMR, FAB-MS), thermogravimetric and elemental analyses. A notable feature of the FAB mass spectrum of the uranyl complex is the appearance of the clusters of the form [(UO2)nO]+(n= 1–7) along with the peak corresponding to molecular ion.

New supramolecular dinuclear Schiff base complexes of yttrium and lanthanides

Abstract The metal-promoted reactions between 2,6-diacetylpyridine and 3,6-dioxaoctane-1,8-diamine, 4,9-dioxadodecane-1,12-diamine or 4,7,10-trioxatridecane-1,13-diamine in the presence of yttrium(III) and lanthanide(III) ions acting as template agents afford new supramolecular dinuclear complexes of podate type with terminal acetylpyridyl groups and N 4 O 4 and N 4 O 5 set of donor atoms as a result of [2+1] Schiff base condensation. The complexes were characterized by spectral data (IR, 1 H NMR, FAB-MS) and elemental analysis.

Disordered structure of propane-1,2-diaminium dichloride.

In the title compound, C3H12N2 2+·2Cl−, the cations are disordered over two well resolved positions in a 0.525 (13):0.475 (13) ratio. The disorder involves two C atoms which assume positions that make an almost mirror-symmetrical system. Similar disorder is observed both at room temperature and at 120 (1) K. The conformation of the NCCN chain in both components is close to trans (the torsion angles ca ±170°), while that of CCCN chain is close to gauche (±50°). In the crystal, a network of relatively strong N—H⋯Cl hydrogen bonds connects the cations and anions into one-cation-deep layers parallel to (001); there are R 2 4(8) and R 2 4(11) ring motifs within the plane. The planes are only loosely connected by van der Waals contacts and electrostatic interactions between cations and anions.

Redetermination of sperminium tetrachloride

In the title compound, 1,5,10,14-tetraazoniatetradecane tetrachloride, C(10)H(30)N(4)(4+).4Cl(-), the sperminium tetracation lies on a centre of symmetry. The two central C-N-C-C torsion angles are gauche and of opposite signs, and all the other torsion angles are trans. All NH groups participate in the three-dimensional hydrogen-bond network, which is additionally strengthened by C-H.Cl interactions.

Putrescinium dichloride: a redetermination at 100 K

The crystal structure of the title compound, C4H14N22+·2Cl−, has been redetermined at 100 (1) K. In the room-temperature structure [Chandrasekhar & Pattabhi (1980). Acta Cryst. B36, 2486–2488], the H atoms were located but their parameters were not refined. Since the hydrogen bonds in this structure are extensive, the H-atom positions are of primary importance. The dication lies on a centre of symmetry and the N atoms are slightly displaced [0.019 (4) A] from the plane of the four C atoms. N—H⋯Cl and C—H⋯Cl hydrogen bonds form a three-dimensional network.