Bis(µ-5-hydr-oxy-2-{[2-(N-phenyl-thio-carbamo-yl)hydrazin-1-yl-idene]meth-yl}phenolato)bis[chloridozinc(II)] N,N-dimethyl-formamide tetra-solvate.

In the dinuclear title compound, [Zn(2)(C(14)H(12)N(3)O(2)S)(2)Cl(2)]·4C(3)H(7)NO, the two monodeprotonated Schiff base ligands N,O,S:O-chelate to Zn atoms. The formally negatively charged O atom involved in chelation also serves as a bridge. The O, O', N and S atoms comprise a square, and the Cl atom the apex of a square pyramid surrounding each metal atom. The solvate dimethyl-formamide mol-ecules, one of which is disordered over two positions in a 3:1 ratio, are hydrogen bonded to the dinuclear mol-ecule.

1-(2,3,4-Trihydroxy-benzyl-idene)-4-ethyl-thio-semicarbazide.

In the title mol-ecule, C(10)H(13)N(3)O(3)S, the thio-semicarbazide =N-NH-C(=S)-NH- fragment is twisted with respect to the aromatic ring [dihedral angle = 20.5 (1)°]. A weak N-H⋯S hydrogen bond [3.480 (1) Å] links two mol-ecules about a center of inversion to generate a ring. The hydr-oxy groups are engaged in inter-molecular hydrogen bonding; the O-H⋯O and O-H⋯S hydrogen bonds generate a layer motif.

1-(2,3,4-Trihydroxy-benzyl-idene)thio-semicarbazide.

In the title mol-ecule, C(8)H(9)N(3)O(3)S, the thio-semicarbazide =N-NH-C(=S)-NH- fragment is twist a different degree of twist in the three independent mol-ecules [dihedral angles = 7.6 (1), 11.6 (1) and 20.7 (1)°]. Intra-molecular O-H⋯N and O-H⋯O hydrogen bonds occur. In the crystal, the hydr-oxy and amino groups are hydrogen-bond donors and the O-H⋯O, O-H⋯S and N-H⋯O hydrogen bonds generate a layer motif.

{2-[(2-Carbamothiol-ylhydrazin-1-yl-idene-κN,S)meth-yl]-6-hy-droxy-phenolato-κO}(triphenyl-phosphine-κP)nickel(II) chloride.

The deprotonated Schiff base ligand in the title compound, [Ni(C(8)H(8)N(3)O(2)S)(C(18)H(15)P)]Cl, functions as an N,O,S-chelating anion to the phosphine-coordinated Ni atom, which exists in a distorted square-planar geometry. The hy-droxy group forms an intra-molecular O-H⋯O hydrogen bond. The two amino groups of the cation are hydrogen-bond donors to the chloride anion; the hydrogen bonds generate a chain structure running along the b axis.

5-Ethyl-5-methyl-4-phenyl-5H-1,2,4-triazol-3(4H)-thione.

The five-membered ring of the title compound Δ(1)-1,2,4-triazoline-5-thione, C(11)H(13)N(3)S, is almost planar (r.m.s. deviation = 0.009 Å); the phenyl ring is aligned at 84.6 (2)° with respect to the five-membered ring. The crystal studied was a racemic twin with an approximate 20% minor twin component. Weak inter-molecular C-H⋯N hydrogen bonding is present in the crystal structure.

(E)-1-(2,4,6-Trihy-droxy-benzyl-idene)-4-ethyl-thio-semicarbazide dihydrate.

In the title mol-ecule, C(10)H(13)N(3)O(3)S·2H(2)O, the thio-semi-carbazide =N-NH-C(=S)-NH- fragment [torsion angle = 0.2 (1)°] is nearly coplanar with the benzene ring [dihedral angle = 2.4 (1)°]. The benzene ring and semicarbazide moiety are located on opposite sites of the C=N bond, showing an E configuration. The hy-droxy, imino and water H atoms are engaged in extensive hydrogen bonding, forming a three-dimensional network.

(6-Hydroxy-2-{[2-(N-methyl-carbamo-thiol-yl)hydrazin-1-yl-idene-κN,S]meth-yl}-phenolato-κO)(triphenyl-phosphane-κP)nickel(II) chloride.

The deprotonated Schiff base ligand in the title salt, [Ni(C(9)H(10)N(3)O(2)S)(C(18)H(15)P)]Cl, functions as an N,O,S-chelating anion to the phosphine-coordinated nickel(II) atom, which exists in a distorted square-planar geometry. The hy-droxy group forms an intra-molecular O-H⋯O hydrogen bond. The two amino groups of the cation are hydrogen-bond donors to the chloride anion; the hydrogen bonds generate a chain structure running along the b axis.

An assessment of the concentrations of particulate polycyclic aromatic hydrocarbons (PAHs) in the aftermath of a chemical store fire incident.

PM10 airborne particles and soot deposit collected after a fire incident at a chemical store were analyzed in order to determine the concentrations of polycyclic aromatic hydrocarbons (PAHs). The samples were extracted with 1:1 hexane-dichloromethane by ultrasonic agitation. The extracts were then subjected to gas chromatography-mass spectrometric (GC-MS) analysis. The total PAHs concentrations in airborne particles and soot deposit were found to be 3.27 +/- 1.55 ng/m3 and 12.81 +/- 24.37 microg/g, respectively. Based on the molecular distributions of PAHs and the interpretation of their diagnostic ratios such as PHEN/(PHEN + ANTH), FLT/(FLT + PYR) and BeP/(BeP + BaP), PAHs in both airborne particles and soot deposit may be inferred to be from the same source. The difference in the value of IP/(IP + BgP) for these samples indicated that benzo[g, h, i] perylene and coronene tend to be attached to finer particles and reside in the air for longer periods. Comparison between the molecular distributions of PAHs and their diagnostic ratios observed in the current study with those reported for urban atmospheric and roadside soil particles revealed that they are of different sources.