Gypenoside XVII

28529774

Treatment of an S-bridged penta­nuclear AgI 3CoIII 2 complex, [Ag3{Co(L)}2]3+ [L 3- = N(CH2NHCH2CH2S−)3], in which two tris­(thiol­ate)-type mononuclear CoIII units ([Co(L)]) are bridged by three AgI ions through S atoms, with iodo­methane (CH3I) gave a new CoIII mononuclear complex, [Co(LMe2)]2+ [LMe2 − = N(CH2NHCH2CH2S−)(CH2NHCH2CH2SCH3)2], systematic name: {2-[(bis{[2-(methylsulfanyl)ethyl]aminomethyl}aminomethyl)amino]ethanethiolato}cobalt(III) bis(hexafluoridophosphate). This cationic complex was crystallized with PF6 − anions to form the title compound, [Co(LMe2)](PF6)2. In the [Co(LMe2)]2+ cation, two of three thiol­ate groups in [Co(L)] are methyl­ated while one thiol­ate group remains unreacted. Although a total of eight stereoisomers are possible for [Co(LMe2)]2+, only a pair of enanti­omers {ΛRR- and ΔSS-[Co(LMe2)]2+} are selectively formed. In the crystal, the complex cations and the PF­6 − anions are connected through weak N—H⋯F, C—H⋯F and C—H⋯S hydrogen bonds into a three-dimensional structure. Two F atoms in one PF6 anion are disordered over two sets of sites with refined occupancies of 0.61 (4) and 0.39 (4) and two F atoms in the other PF6 − anion are disordered over two sets of sites with occupancies of 0.5.

crystal structure, alkyl­ation reaction, coordination compound, thiol­ate complex, thio­ether complex, cobalt ion

Synthesis and crystallographic characterization of a mononuclear cobalt(III) complex possessing both thiol­ate and thio­ether donors: reactivity of an thiol­ate-bridged penta­nuclear Co2Ag3 complex with iodo­methane

Yosuke Fukuda,a Nobuto Yoshinari,a,* and Takumi Konnoa

2017 Apr 11

24663113

Lipid production is an important indicator for assessing microalgal species for biodiesel production. In this work, the effects of medium composition on lipid production by Scenedesmus sp. were investigated using the response surface methodology. The results of a Plackett-Burman design experiment revealed that NaHCO3, NaH2PO4·2H2O and NaNO3 were three factors significantly influencing lipid production, which were further optimized by a Box-Behnken design. The optimal medium was found to contain 3.07 g L−1 NaHCO3, 15.49 mg L−1 NaH2PO4·2H2O and 803.21 mg L−1 NaNO3. Using the optimal conditions previously determined, the lipid production (304.02 mg·L−1) increased 54.64% more than that using the initial medium, which agreed well with the predicted value 309.50 mg L−1. Additionally, lipid analysis found that palmitic acid (C16:0) and oleic acid (C18:1) dominantly constituted the algal fatty acids (about 60% of the total fatty acids) and a much higher content of neutral lipid accounted for 82.32% of total lipids, which strongly proved that Scenedesmus sp. is a very promising feedstock for biodiesel production.

optimization, lipid production, Scenedesmus sp., response surface methodology, biodiesel

Optimization of Medium Using Response Surface Methodology for Lipid Production by Scenedesmus sp.

Fangfang Yang,1,2 Lijuan Long,1 Xiumei Sun,1,2 Hualian Wu,1 Tao Li,1 and Wenzhou Xiang1,*

2014 Mar 6.