Syntheses, crystal structures, weak interactions, spectra, and thermal properties of two new ion-pair complexes based on di(nitriledithiolate)nickel(II) anion and 4-nitrobenzyl isoquinolinium
INORGANIC AND NANO-METAL CHEMISTRY
Authors: Liu, Yin; Wang, Bing-Wu; Guo, Zi-Qi; Liao, Xiao-Lan; Chen, Yang-Li; Zhang, Zheng; Zhou, Jia-Rong; Ni, Chun-Lin
Abstract
The chemical preparation, spectroscopic characterization, and crystal structures of two new ion-pair complexes, [4NO(2)BzIQl](2)[Ni(mnt)(2)](1) and [4NO(2)BzIQI](2)[Ni(i-mnt)(2)] (2) ([4NO(2)BzIQI](+) = 4-nitrobenzyl isoquinolinium, mnt(2-) = maleonitriledithiolate and i-mnt(2-) = iso-maleonitriledithiolate), have been reported. Both 1 and 2 crystallize in the triclinic system in space group P-1. The cations of 1 stack into a 1D alternating column through C-H center dot center dot center dot pi, pi center dot center dot center dot pi and p center dot center dot center dot pi interactions, while the [4NO(2)BzIQI](+) cations (C) and [Ni(i-mnt)(2)](2-) anions (A) of 2 stack into another 1D alternative column with a A-CC-A-CC-A sequence. Weak N center dot center dot center dot Ni, C-H center dot center dot center dot Ni, C-H center dot center dot center dot N, C-H center dot center dot center dot S, and p center dot center dot center dot pi interactions observed in 1 and 2 consolidate a 3D network structure. Thermal analysis reveals that 1 and 2 are stable up to 211 degrees C and 208 degrees C, respectively, and the final decomposition product of two complexes is nickel oxide.
Mitigation of As accumulation in paddy rice (Oryza sativa L.) by amendments containing iron and manganese
ENVIRONMENTAL ARSENIC IN A CHANGING WORLD (AS2018)
Authors: Lei, M.; Tang, L.; Du, H. H.; Peng, L.; Tie, B. Q.; Sun, G. X.
Abstract
In order to mitigate As accumulation in rice, amendments such as iron ore tailing (FeT) and manganese ore tailing (MnT) were employed in As contaminated soil. Before experiment, the toxicities of both amendments were assessed with Toxicity Characteristic Leaching Procedure (TCLP) and horizontal vibration method (HVM), respectively. The ranges of contents of As were 0.13-1.54 mg kg(-1) in husk samples, and 0.06-0.42 mg kg(-1) in brown rice, respectively. Among both amendments treatment, the lowest concentrations of As in rice grain were found by MnT treatment due to its structure and composition. There was significantly negative relation (p < 0.05) between Mn and As, while significantly positive relationship between Fe and As, and ratio of Fe/Mn and As in rice plant (p < 0.05).