Benzyl­ethyl­dimethyl­ammonium bromide

The crystal structure of the title compound, C11H18N+·Br−, has been determined as part of an ongoing study of the influence of the alkyl chain length on amphiphilic activity of quaternary ammonium salts. The title salt forms a three-dimensional network of ionic contacts through weak C—H⋯Br hydrogen bonds, with donor–acceptor distances in the range 3.757 (2)–3.959 (2) Å, in which methyl groups serve as donors

7-Methoxy-2-phenylchroman-4-one

In the title compound, C 16 H 14 O 3 , the ring O atom and the two adjacent non-fused C atoms, as well as the attached phenyl ring, exhibit static disorder [occupancy ratio 0.559 (12): 0.441 (12)]. The crystal packing features – [centroid– centroid distance = 3.912 (1) A ̊ ] and C—H interactions.In the title compound, C16H14O3, the ring O atom and the two adjacent non-fused C atoms, as well as the attached phenyl ring, exhibit static disorder [occupancy ratio 0.559 (12):0.441 (12)]. The crystal packing features [pi]-[pi] [centroid-centroid distance = 3.912 (1) Å] and C-H...[pi] inter­actions

(2Z)-2-Anilino-2-[oxido(phen­yl)iminio]-N-(2-pyrid­yl)acetamide methanol 0.425-solvate

The title compound, C19H16N4O2·0.425CH4O, crystallizes with two formula units per asymmetric unit. Researching its crystal structure constitutes part of a study of the nature of inter­actions between the N+—O− group and the vicinal NH group. The nitrone group and methanol solvent mol­ecules are linked via four N—H⋯O and one O—H⋯O hydrogen bonds, with donor–acceptor distances of 2.603 (3)–2.730 (3) and 2.770 (3) Å, respectively. The crystal structure also involves two intermolecular N—H⋯N hydrogen bonds

Synthesis, structure and properties of V(V) monooxido complex with ONO tridentate Schiff base

The oxidovanadium(V) Schiff base complex of formula [VO(L)(EtO)(EtOH)] (where H2L = Schiff base ligand derived from 5-methoxysalicylaldehyde and phenylacetic hydrazide) was synthesized and described. Complex crystalizes in triclinic P-1 space group. Octahedral geometry of the vanadium(V) centre is filed with oxido, ONO L2- ligand and two solvent molecules both in ethoxo and as neutral ethanol form. The complex is neutral, with 5- and 6-memebered ring formed by ONO ligand coordinated in octahedral plane with oxido and EtOH ligands in vertical positions. Two isomers are present in the unit cell, with different position of 5-membered ring versus vertical plane. The elemental analysis, magnetic susceptibility, thermogravimetry and spectroscopy (IR, UV-Vis) measurements were measured and are discussed. The cyclic voltammetry measurements show irreversible processes for vanadium(IV/V) redox system. Thermal stability both in a solid state (TG and SDTA measurements) as well as in solutions (at pH 7.0 and 2.0, studied by UV-Vis spectroscopy) is discussed

Thermal and long period stability of series of V(V), V(IV) and V(III) complex with Schiff base ligands in solid state

The synthesis and physicochemical properties of three new complexes of vanadium at +5, +4 and +3 oxidation state are described and discussed. The octahedral surrounding of vanadium for V(III) complexes of [V(L1)(HL1)] general formula is filled with two ONO tridentate ligand L, for V(IV) one ONO ligand L, oxido ligand and 1,10-phenanthroline (phen) as a co-ligand are presented in complexes of [VO(L2)(phen)]. For V(V) the complexes of [VO2(L1)(solv)] type were formed. As ligands, the H2L Schiff bases were formed in reaction between 5-hydroxysalcylaldehyde and phenylacetic hydrazide (H2L1) and 3,5- dichlorosalicyaldehyde and 4-hydroxybenzhydrazide (L2). The magnetic moment measurements, in 8 year period, show, that V(III) complexes slowly oxidise to V(IV) with preservation of the nonoxido character of the complexes, while V(IV) complexes were found to be stable. The TG and SDTA measurements indicate, that thermal stability depends mainly on the oxidation state of vanadium. The less thermally stable are the V(V) complexes, while V(IV) and V(III) are stable up to ca. 200oC. In solution, at pH 2 (similar to that in human digestion system), again the V(IV) are the most stable, only at pH 7.0 V(III) complexes had higher stability. The most stable, thus best for pharmaceutical use, are V(IV) complexes

Cadmium(II) and calcium(II) complexes with N,O-bidentate ligands derived from pyrazinecarboxylic acid

The synthesis and characterization of cad- mium(II) and calcium(II) complexes with N , O -bidentate ligands derived from pyrazinecarboxylic acid (3-hydroxy- 2-quinoxalinecarboxylic acid HL 1 , pyrazine-2-carboxylic acid HL 2 ) are reported. Obtained compounds [Cd(L 1 ) 2 (H 2 O) 2 ](H 2 O) 2 ( 1 ), [Cd(L 2 ) 2 ] n ( 2 ) and [Ca(L 2 ) 2 (H 2 O) 4 ]( 3 ) were studied by elemental analyses, IR, Raman spectros- copy and thermogravimetric methods (TG, DTG, DSC). In addition, the molecular structure of complex 1 has been determined by X-ray single crystal diffraction. Thermal analysis reveals a decomposition process of 1 , 3 complexes in multiple stages. The data obtained from TG and DSC curves for 1 , 3 confirm not only the presence but also the nature of water (crystallization and coordination) and the stoichiometry of the studied metal complexes. The results of thermal studies are in good agreement with their crystal structures. Thermal behavior of complex 2 indicates a single complete decomposition process of the sample. In addition, complex 2 as a coordination polymer is the most stable all of them and the thermal stability of the obtained complexes can be ordered in the following sequence: 1 \ 3 2