Facile synthesis of substituted nitrilotriacetamides
摘要:
Ligands which contain multiple amide groups represent interesting possibilities as chelating agents. We report here a facile synthesis and crystal structure of nitrilotriacetamide, 2, a neutral tetradentate ligand which we have been studying for metal complexation. Also described herein is a divergent synthesis of the mono, di- and trimethylated and dimethyl-monoalkyl derivatives of 2.
Characterization of [Pb(NO3)(ntam)2]NO3, the first metal complex of the neutral tetradentate ligand nitrilotriacetamide (ntam)
作者:Douglas A. Smith、Steven Sucheck、A. Alan Pinkerton
DOI:10.1039/c39920000367
日期:——
The first isolable, crystalline complex of nitrilotriacetamide with a metal and the first example of both a completely acyclic ligand and a 2 : 1 ligand: metal ratio in a ten-coordinate lead complex is reported.
The amide oxygen donor. Metal ion coordinating properties of the ligand nitrilotriacetamide. A thermodynamic and crystallographic study
作者:Laura A. Clapp、Chynthia J. Siddons、Donald G. VanDerveer、Joseph H. Reibenspies、S. Bart Jones、Robert D. Hancock
DOI:10.1039/b512017a
日期:——
of [Pb(ntam)(NO3)2]2 (1) and [Ca2(ntam)3(H2O)2](ClO4)4·3H2O (2) are reported. For 1: triclinic, space group P, a = 7.4411(16), b = 9.0455(19), c = 11.625(3) Å, α = 69.976(4), β = 79.591(4), γ = 67.045(3)°, Z = 2, R = 0.0275. For 2: monoclinic, space group P21/c, a = 10.485(2), b = 11.414(2), c = 38.059(8) Å, β = 92.05(3)°, Z = 4, R = 0.0634. Structure 1 is dimeric with two Pb atoms linked by bridging
ntam(次氮基三乙酰胺)的报告。在25°C下于0.1 M NaClO 4中,ntam的质子化常数(p K)为2.6 。在25°C下于0.1 M NaClO 4中的形成常数(log K 1)由下式确定:1 H NMR 和 紫外可见 光谱学分别为:Ca(II),1.28;镁(II),0.4;La(III),2.30;铅(II),3.69。Cd(II),3.78; m / z。Ni(II),2.38; N,2。铜(II),3.16。讨论了ntam配合物的实测log K 1值,如p K所证明的那样,是因为N供体的碱度较低,以及金属离子尺寸对配合物稳定性的影响。这酰胺相对于NH 3络合物的log K 1,ntam的O供体导致大型金属离子(Pb(II),Cd(II),La(III),Ca(II))的络合物的稳定化,而对于较小的金属离子金属离子(Ni(II),Cu(II))酰胺O型供体会导致不稳定。就
Process for producing glycine
申请人:Asahi Kasei Kabushiki Kaisha
公开号:EP1770169A1
公开(公告)日:2007-04-04
A method for producing glycine in which an aqueous solution of glycinonitrile is subjected to a hydrolysis reaction in a hydrolysis reaction system in which the oxygen dissolved therein is maintained in an amount of 5 ppm by weight or less, under the action of a microbial enzyme having the activity to hydrolyze a nitrile group. The glycinonitrile is converted to glycine with by-production of ammonia. The hydrolysis of glycinonitrile is conducted either in the presence of the ammonia or while recovering the by-produced ammonia separately from the recovery of glycine in the absence of a base and an acid.
Method of monitoring fluid flow from a reservoir using well treatment agents
申请人:Baker Hughes Incorporated
公开号:US10641083B2
公开(公告)日:2020-05-05
A method of treating a multi-zoned subterranean formation with composites having well treatment agents is disclosed. The well treatment agent treated in each zone is distinguishable. At least a portion of the well treatment agent is released from one of the composites into the well or formation. The formation of undesirable contaminants may be inhibited or prevented in the well or in the formation by the release of the well treatment agent from one or more of the composites. The well treatment agent also serves as a tracer. When fluid transported from the formation or well is collected, the source of the transported fluid may be determined by comparing a chemical or physical parameter of the well treatment agent with a working set of known taggants.
Detection of trace chemicals in oil and gas applications
申请人:Murugesan Sankaran
公开号:US10739269B2
公开(公告)日:2020-08-11
A method of analyzing a well sample for a well treatment additive includes contacting the sample with functionalized metallic nanoparticles that contain metallic nanoparticles functionalized with a functional group including a cyano group, a thiol group, a carboxyl group, an amino group, a boronic acid group, an aza group, an ether group, a hydroxyl group, or a combination including at least one of the foregoing; irradiating the sample contacted with the functionalized metallic nanoparticles with electromagnetic radiation at a selected energy level; measuring a Raman spectrum emitted from the sample; and determining presence, type or concentration of the well treatment additive in the sample from the Raman spectrum.