Poly[di-μ2-aqua-μ5-(pyridine-2,6-dicarboxyl­ato)-μ3-(pyridine-2,6-dicarboxyl­ato)-cobalt(II)disodium]

In the title compound, [CoNa2(C7H3NO4)2(H2O)2]n, the CoII atom is coordinated by two pyridine N atoms and four carboxyl­ate O atoms from two doubly deprotonated pyridine-2,6-dicarboxyl­ate ligands in a distorted octa­hedral geometry. One Na+ cation is coordinated by three carboxyl­ate O atoms and two water mol­ecules and the other is coordinated by five carboxyl­ate O atoms and two water mol­ecules in an irregular geometry. The bis­(pyridine-2,6-dicarboxyl­ato)cobalt complex units are connected by Na+ cations and bridging water mol­ecules into a three-dimensional coordination network. O—H⋯O hydrogen bonds are formed between the water mol­ecules and the carboxyl­ate O atoms

Potassium 2-(N-hydroxy­carbamo­yl)acetate monohydrate

The crystal structure of the title compound, K+·C3H4NO4 −·H2O, consists of potassium cations, monoanions of 2-carboxy­acetohydroxamic acid [namely 2-(N-hydroxy­carbamo­yl)acetate] and solvent water mol­ecules. The elements of the structure are united in a three-dimensional network by numerous K⋯O coordinate bonds and O—H⋯O and N—H⋯O hydrogen bonds. The coordination sphere of the K+ ions may be described as a distorted double capped octa­hedron. Bond lengths and angles are similar to those in related compounds

(2RS)-3-Hydr­oxy-2-methyl-2-(2-pyrid­yl)imidazolidine-4-one

The title structure, C9H11N3O2, is a racemate. The chiral centre is situated at the N—C—N C atom of the imidazolidine ring. The inter­planar angle between the mean planes of the pyridine and imidazolidine rings is 89.41 (5)°. The methyl group is in a trans position with respect to the pyridine N atom. In the crystal, the mol­ecules are arranged in zigzag layers parallel to the b axis. The mol­ecules within the layers are inter­connected by strong O—H⋯N and weak N—H⋯O hydrogen bonds; the former take place between OH groups and amine N atoms and the latter between the amine N atom and the carbonyl O atom. In addition, C—H⋯O inter­actions are also present

2,2′-Dihydroxybiphenyl-3,3′-di­carb­aldehyde dioxime

The mol­ecule of the title compound, C14H12N2O4, lies across a crystallographic inversion centre situated at the mid-point of the C—C intra-annular bond. The mol­ecule is not planar, the dihedral angle between the aromatic rings being 50.1 (1)°. The oxime group is in an E position with respect to the –OH group and forms an intra­molecular O—H⋯N hydrogen bond. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds link mol­ecules into chains propagating along [001]. The crystal structure is further stabilized by inter­molecular stacking inter­actions between the rings [centroid-to-centroid distance = 3.93 (1) Å], resulting in layers parallel to the bc plane

cis-Bis(2,2′-bipyridine-κ2 N,N′)bis­(dimethyl sulfoxide-κO)zinc bis­(tetra­phenyl­borate) dimethyl sulfoxide monosolvate

In the mononuclear title complex, [Zn(C10H8N2)2(C2H6OS)2](C24H20B)2·C2H6OS, the ZnII ion is coordinated by four N atoms of two bidentate 2,2′-bipyridine mol­ecules and by the O atoms of two cis-disposed dimethyl sulfoxide mol­ecules in a distorted octa­hedral geometry. The S atom and the methyl groups of one of the coordinated dimethyl sulfoxide mol­ecules are disordered in a 0.509 (2):0.491 (2) ratio. The crystal packing is stabilized by C—H⋯O hydrogen bonds between the dimethyl sulfoxide solvent mol­ecules and tetra­phenyl­borate anions

Crystal structure of dichlorido{N1-phenyl-N4-[(quinolin-2-yl-κN)methylidene]benzene-1,4-diamine-κN4}mercury(II)

In the mononuclear title complex, [HgCl2(C22H17N3)], synthesized from the quinoline-derived Schiff base N1-phenyl-N4-[(quinolin-2-yl)methylidene]benzene-1,4-diamine (PQMBD) and HgCl2, the coordination sphere around the Hg2+ atom is distorted tetrahedral, comprising two Cl atoms [Hg—Cl = 2.3487 (14) and 2.4490 (15) Å] and two N atom donors from the PQMBD ligand, viz. the quinolyl and the imine N atom [Hg—N = 2.270 (4) and 2.346 (4) Å, respectively]. The dihedral angle between the two benzene rings attached to the amino group is 43.7 (3)°. In the crystal, N—H...Cl and C—H...Cl hydrogen bonds, as well as π–π stacking interactions between one phenyl ring and the pyridine ring of the quinoline moiety of an adjacent molecule [centroid-to-centroid separation = 3.617 (4) Å] are observed, resulting in a three-dimensional network

The Contribution of Actinobacteria to the Degradation of Chlorinated Compounds: Variations in the Activity of Key Degradation Enzymes

Bacteria make a huge contribution to the purification of the environment from toxic stable pollutants of anthropogenic and natural origin due to the diversity of their enzyme systems. For example, the ability to decompose 3-chlorobenzoate (3CBA) by the four representative genera of Actinobacteria, such as Rhodococcus, Gordonia, Microbacterium, and Arthrobacter, was studied. In most cases, the formation of 4-chlorocatechol as the only key intermediate during the decomposition of 3CBA was observed. However, Rhodococcus opacus strain 1CP was an exception, whose cells decomposed 3CBA via both 3-chloro- and 4-chlorocatechol. The enzyme 3-Chlorobenzoate 1,2-dioxygenase (3CBDO) induced during the growth of these bacteria in the presence of 3CBA differed significantly in substrate specificity from the benzoate dioxygenases induced upon growth in the presence of benzoate. The R. opacus 6a strain was found to contain genes encoding chlorocatechol 1,2-dioxygenase, chloromuconate cycloisomerase, and dienelactone hydrolase, whose nucleotide sequence was 100% consistent with the sequences of the corresponding genes encoding the enzymes of the modified 4-chlorocatechol ortho-cleavage pathway of the strain R. opacus 1CP. However, the gene encoding chloromuconolactone dehalogenase (clcF) was not found in the representatives of the actinomycete genera, including Gordonia and Arthrobacter. A linear mega-plasmid carrying 3-chlorocatechol degradation genes remained stable after maintaining the R. opacus 1CP strain on an agar-rich medium for 25 years. In general, a similar plasmid was absent in actinobacteria of other genera, as well as in closely related species of R. opacus 6a

Pyridinium bis(pyridine-κN)tetrakis(thiocyanato-κN)ferrate(III)

In the title compound, (C5H6N)[Fe(NCS)4(C5H5N)2], the FeIII ion is coordinated by four thiocyanate N atoms and two pyridine N atoms in a trans arrangement, forming an FeN6 polyhedron with a slightly distorted octahedral geometry. Charge balance is achieved by one pyridinium cation bound to the complex anion via N—H...S hydrogen bonding. The asymmetric unit consists of one FeIII cation, four thiocyanate anions, two coordinated pyridine molecules and one pyridinium cation. The structure exhibits π–π interactions between pyridine rings [centroid–centroid distances = 3.7267 (2), 3.7811 (2) and 3.8924 (2) Å]. The N atom and a neighboring C atom of the pyridinium cation are statistically disordered with an occupancy ratio of 0.58 (2):0.42 (2)