Hai-Yan Chen

Bio: Hai-Yan Chen is an academic researcher from Guangxi University. The author has contributed to research in topics: Chemistry & Ring (chemistry). The author has an hindex of 3, co-authored 3 publications receiving 15 citations.

Changes in Chemical Composition and Copepod Toxicity during Petroleum Photo-oxidation.

Abstract: Photoproducts can be formed rapidly in the initial phase of a marine oil spill. However, their toxicity is not well understood. In this study, oil was irradiated, chemically characterized, and tested for toxicity in three copepod species (Acartia tonsa, Temora longicornis, and Calanus finmarchicus). Irradiation led to a depletion of polycyclic aromatic hydrocarbons (PAHs) and n-alkanes in oil residues, along with an enrichment in aromatic and aliphatic oil photoproducts. Target lipid model-based calculations of PAH toxicity units predicted that PAH toxicities were lower in water-accommodated fractions (WAFs) of irradiated oil residues ("irradiated WAFs") than in WAFs of dark-control samples ("dark WAFs"). In contrast, biomimetic extraction (BE) measurements showed increased bioaccumulation potential of dissolved constituents of irradiated WAFs compared to dark WAFs, mainly driven by photoproducts present in irradiated oil. In line with the BE results, copepod mortality increased in irradiated WAFs compared to dark WAFs. However, low copepod toxicities were observed for WAFs produced with photo-oxidized oil slicks collected during the Deepwater Horizon oil spill. The results of this study suggest that while oil photoproducts have the potential to be a significant source of copepod toxicity, dilution and dispersion of these higher solubility products appear to help mitigate their toxicity at sea.

(E)-Methyl 3-(3,4-dihy-droxy-phen-yl)acrylate.

Abstract: The benzene ring in the title compound, C10H10O4, makes an angle of 4.4 (1)° with the C—C—C—O linker. The hy­droxy groups are involved in both intra- and inter­molecular O—H⋯O hydrogen bonds. The crystal packing is stabilized by O—H⋯O hydrogen-bonding inter­actions. The mol­ecules of the caffeic acid ester form a dimeric structure in a head-to-head manner along the a axis through O—H⋯O hydrogen bonds. The dimers inter­act with one another through O—H⋯O hydrogen bonds, forming supermolecular chains. These chains are further extended through C—H⋯O hydrogen bonds as well as van der Waals inter­actions into the final three-dimensional architecture.

Bis(diethylenetriamine)cobalt(III) hexacyanocobaltate(III) dihydrate

Abstract: The title compound, [Co(C4H13N3)2][Co(CN)6]·2H2O, comprises one [Co(dien)2]3+ cation (dien is diethyl­ene­triamine), one [Co(CN)6]3− anion and two water molecules. The Co3+ atom of the [Co(dien)2]3+ cation is six-coordinated by six N atoms from two diethyl­enetriamine groups. The Co3+ atom of the [Co(CN)6]3− anion is six-coordinated by six C atoms from six cyanide ions. Neighboring cations and anions are connected by hydrogen bonds to each other and to the water molecules. The metal atoms lie on inversion sites.

3β-Hydroxy­friedelan-17β-carboxylic acid

Abstract: The title compound, C30H50O3, which was isolated from a marine endophytic fungus, is a new friedelan derivative. The mol­ecule contains five six-membered rings, which exhibit boat (ring A), distorted boat (ring B) and chair (rings C–E) conformations. The crystal structure is stabilized by inter­molecular O—H⋯O hydrogen bonds, which link neighbouring mol­ecules into 12-membered rings.

Terpenes from marine-derived fungi.

Abstract: Terpenes from marine-derived fungi show a pronounced degree of structural diversity, and due to their interesting biological and pharmacological properties many of them have aroused interest from synthetic chemists and the pharmaceutical industry alike. The aim of this paper is to give an overview of the structural diversity of terpenes from marine-derived fungi, highlighting individual examples of chemical structures and placing them in a context of other terpenes of fungal origin. Wherever possible, information regarding the biological activity is presented.

Terpenoids from Endophytic Fungi

Abstract: This work reviews the production of terpenoids by endophytic fungi and their biological activities, in period of 2006 to 2010. Sixty five sesquiterpenes, 45 diterpenes, five meroterpenes and 12 other terpenes, amounting to 127 terpenoids were isolated from endophytic fungi.

Chloridobis(ethyl-enediamine-κN,N')(n-pentyl-amine-κN)cobalt(III) dichloride monhydrate.

Abstract: The title complex, [CoCl(C5H13N)(C2H8N2)2]Cl2·H2O, comprises one chloridobis(ethyl­enediamine)(n-pentyl­amine)cobalt(III) cation, two chloride counter-anions and a water mol­ecule. The CoIII atom of the complex is hexa­coordinated by five N and one Cl atoms. The five N atoms are from two chelating ethyl­enediamine and one n-pentyl­amine ligands. Neighbouring cations and anions are connected by N—H⋯Cl and N—H⋯O hydrogen bonds to each other and also to the water mol­ecule.