首页> 外文学位 >Complexations of cobalt(II) with chloride and bromide, dissolution kinetics of cobaltous-oxide: Experimental studies and geological implications.

【24h】

Complexations of cobalt(II) with chloride and bromide, dissolution kinetics of cobaltous-oxide: Experimental studies and geological implications.

机译：钴（II）与氯化物和溴化物的络合，氧化钴的溶解动力学：实验研究和地质意义。

获取原文

页面导航

摘要
著录项
相似文献
相关主题

摘要

Absorption spectra of chloro- and bromo-Co(II) complexes have been taken in the UV-visible region at temperatures up to 90{dollar}spcirc{dollar}C. The stability constants are determined from the spectral data, and are listed.; The calculated thermodynamic data indicate that CoX(H{dollar}sp2{dollar}O){dollar}sbsp{lcub}5{rcub}{lcub}+{rcub}{dollar} and CoX{dollar}sbsp{lcub}4{rcub}{lcub}2-{rcub}{dollar} are strong complexes, and that the other octahedral complexes are weaker. The thermodynamic data for the stepwise transformation reaction suggest a relative order of conversion: CoCl{dollar}sb4{dollar}(H{dollar}sb2{dollar}O){dollar}sbsp{lcub}2{rcub}{lcub}2-{rcub}{dollar} {dollar}>{dollar} CoCl{dollar}sb3{dollar}(H{dollar}sb2{dollar}O){dollar}sbsp{lcub}3{rcub}{lcub}-{rcub}{dollar} {dollar}>{dollar} Co(H{dollar}sb2{dollar}O){dollar}sbsp{lcub}6{rcub}{lcub}2+{rcub}{dollar} {dollar}>{dollar} CoCl{dollar}sb2{dollar}(H{dollar}sb2{dollar}O){dollar}sbsp{lcub}4{rcub}{lcub}0{rcub}{dollar} {dollar}>{dollar} CoCl(H{dollar}sb2{dollar}O){dollar}sbsp{lcub}5{rcub}{lcub}+{rcub}{dollar}. Bromide complexes show a similar order.; A simple flow-system was designed for kinetic studies of mineral dissolution. CoO dissolution is controlled by a surface reaction. By using transition state theory, the following integrated kinetic equation is obtained. a{dollar}rmsb{lcub}{lcub}Co(Hsb{lcub}2{rcub}O){rcub}sbsp{lcub}6{rcub}{lcub}2+{rcub}{rcub}{dollar} = {dollar}rm{lcub}ksb1CoOsp{lcub}asp2{rcub}Hsp{lcub}+asp5{rcub}Hsb2O{rcub}over{lcub}ksp2{rcub}{dollar} (1 {dollar}-{dollar} e{dollar}sp{lcub}rm -Aksb{lcub}2{rcub}t/asbsp{lcub}Hsb2O{rcub}{lcub}5{rcub}{rcub}{dollar}) where k{dollar}sb1{dollar} and k{dollar}sb2{dollar} are respectively 1.6 {dollar}times{dollar} 10{dollar}sp{lcub}-10{rcub}{dollar} and 1.3 {dollar}times{dollar} 10{dollar}sp{lcub}-9{rcub}{dollar} at 25{dollar}spcirc{dollar}C. CoO is not stable when in acidic aqueous solutions. It gradually transforms into Co{dollar}sb3{dollar}O{dollar}sb4{dollar} which is essentially insoluble at experimental conditions. The rate of this transition and its dependence on pH are also estimated and discussed.; The total concentration of cobalt can be factored into two terms: a free cobalt term which reflects the environmental constraints and an enhancement factor due to chloride complexes. The enhancement factor remains low up to about 3 {dollar}msb{lcub}rm Clsp-{rcub}{dollar}, and shows little variance with temperature up to 90{dollar}spcirc{dollar}C. At higher salinities ({dollar}>{dollar}3 &mol), this term increases rapidly with increasing temperature and/or salinity due to the formation of tetrahedral complex. A typical enhancement factor for the sediment-hosted stratiform (low T and high {dollar}msb{lcub}rm Clsp-{rcub}{dollar}) and the volcanic-associated massive sulfide (high T and low {dollar}msb{lcub}rm Clsp-{rcub}{dollar}) ore fluids is around 100, which is able to transport several ppm of cobalt in sulfide-bearing fluids. To form major cobalt-bearing deposits, either a higher enhancement factor, a higher free cobalt term or both are required, provided that a sufficient cobalt source is available and the kinetic effects are favorable.; Employing an equilibrium model and using the stability constants obtained in this work and in the literature, cobalt speciation in seawater is recalculated as: 36.1% Co{dollar}sp{lcub}2+{rcub}{dollar}, 25.4% CoCl{dollar}sp+{dollar}, 24.4% CoCO{dollar}sbsp{lcub}3{rcub}{lcub}0{rcub}{dollar}, 10.5% CoSO{dollar}sbsp{lcub}4{rcub}{lcub}0{rcub}{dollar} and 3.1% CoCl{dollar}sbsp{lcub}2{rcub}{lcub}0{rcub}.{dollar}

机译：氯-和溴-Co（II）配合物的吸收光谱已在高达90℃的温度下于紫外线可见区域拍摄。从光谱数据确定稳定性常数，并列出。计算得出的热力学数据表明CoX（H {dollar} sp2 {dollar} O）{dol} sbsp {lcub} 5 {rcub} {lcub} + {rcub} {dollar}和CoX {dollar} sbsp {lcub} 4 { rcub} {lcub} 2- {rcub} {dollar}是强复合物，而其他八面体复合物则较弱。逐步转化反应的热力学数据表明转化的相对顺序：CoCl {dollar} sb4 {dollar}（H {dollar} sb2 {dollar} O）{dollar} sbsp {lcub} 2 {rcub} {lcub} 2- {rcub} {dollar} {dollar}> {dollar} CoCl {dollar} sb3 {dollar}（H {dollar} sb2 {dollar} O）{dollar} sbsp {lcub} 3 {rcub} {lcub}-{rcub} {dollar} {dollar}> {dollar} Co（H {dollar} sb2 {dollar} O）{dollar} sbsp {lcub} 6 {rcub} {lcub} 2+ {rcub} {dollar} {dollar}> {dollar } CoCl {dollar} sb2 {dollar}（H {dollar} sb2 {dollar} O）{dollar} sbsp {lcub} 4 {rcub} {lcub} 0 {rcub} {dollar} {dollar}> {dollar} CoCl（ H {dollar} sb2 {dollar} O）{dollar} sbsp {lcub} 5 {rcub} {lcub} + {rcub} {dollar}。溴化物配合物显示相似的顺序。设计了一个简单的流动系统，用于矿物溶解的动力学研究。 CoO溶解通过表面反应控制。通过使用过渡态理论，可获得以下积分动力学方程。 a {dollar} rmsb {lcub} {lcub} Co（Hsb {lcub} 2 {rcub} O）{rcub} sbsp {lcub} 6 {rcub} {lcub} 2+ {rcub} {rcub} {dollar} = {美元} rm {lcub} ksb1CoOsp {lcub} asp2 {rcub} Hsp {lcub} + asp5 {rcub} Hsb2O {rcub}超过{lcub} ksp2 {rcub} {dollar}（1 {dollar}-{dollar} e {dollar } sp {lcub} rm -Aksb {lcub} 2 {rcub} t / asbsp {lcub} Hsb2O {rcub} {lcub} 5 {rcub} {rcub} {dollar}），其中k {dollar} sb1 {dollar}和k {dollar} sb2 {dollar}分别为1.6 {dollar}倍{dollar} 10 {dollar} sp {lcub} -10 {rcub} {dollar}和1.3 {dollar}倍{dollar} 10 {dollar} sp {lcub} -9 {rcub} {dollar} at 25 {dollar} spcirc {dollar} C。在酸性水溶液中，CoO不稳定。它逐渐转化为在实验条件下基本上不溶的Co {sb3 {dollar} O {dollar} sb4 {dollar}。还估计并讨论了这种转变的速率及其对pH的依赖性。钴的总浓度可以分为两个术语：反映环境限制的游离钴术语和由于氯化物络合物而产生的增强因子。增强因子一直保持较低，直到约3 {msb {lcub} rm Clsp- {rcub} {dollar}，并且在高达90 90spcirc {dollar} C的温度下几乎没有变化。在较高的盐度下（{dollar}> {dollar} 3＆mol），由于四面体复合物的形成，该术语随着温度和/或盐度的增加而迅速增加。沉积物层状地层（低T和高{msb {lcub} rm Clsp- {rcub} {dollar}）和与火山相关的块状硫化物（高T和低{dollar} msb {lcub）的典型增强因子} rm Clsp- {rcub} {dollar}）矿液约为100，它能够在含硫化物的流体中输送几ppm的钴。为了形成主要的含钴沉积物，只要有足够的钴源可用并且动力学效果良好，就需要更高的增强因子，更高的游离钴含量或两者兼有。使用平衡模型并使用在这项工作和文献中获得的稳定性常数，将海水中的钴形态重新计算为：36.1％Co {dollar} sp {lcub} 2+ {rcub} {dollar}，25.4％CoCl {dollar } sp + {dollar}，24.4％CoCO {dollar} sbsp {lcub} 3 {rcub} {lcub} 0 {rcub} {dollar}，10.5％CoSO {dollar} sbsp {lcub} 4 {rcub} {lcub} 0 { rcub} {dollar}和3.1％CoCl {dollar} sbsp {lcub} 2 {rcub} {lcub} 0 {rcub}。{dollar}

著录项

作者
Pan, Pujing.;
展开▼
作者单位

University of New Brunswick (Canada).;

展开▼
授予单位 University of New Brunswick (Canada).;
学科 Geochemistry.
学位 Ph.D.
年度 1989
页码
总页数
原文格式 PDF
正文语种 eng
中图分类地质学;
关键词

相似文献

外文文献
中文文献
专利

1. Oxidation of Cobalt(III) Complexes of Α-Hydroxy Acids by Nicotinium Di Chromate (NDC) in the Presence of Dimethyl Diocta Decyl Ammonium Chloride (DDAC) - A Kinetic and Mechanistic Study [J] . K. Murali, Mansur Ahmed, Mohammed Nawaz Acta Chimica and Pharmaceutica Indica . 2015,第2期

机译：二甲基二辛基癸基氯化铵（DDAC）存在下，二铬酸镍（NDC）氧化α-羟基钴（III）配合物的动力学和机理研究
2. Kinetic study of complex formation of by 2-nitroso-1-naphthol with cobalt(II) ion in presence of cetyltrimethylammonium bromide surfactant [J] . Ei-Aila HJY Journal of Dispersion Science and Technology . 2007,第6期

机译：十六烷基三甲基溴化铵表面活性剂存在下2-亚硝基-1-萘酚与钴（II）离子形成配合物的动力学研究
3. Donor Property of Cobalt(II) Schiff Base Complexes Toward Triphenyltin(IV)-chloride: A Kinetic Study [J] . ZAHRA ASADI, MOZAFFAR ASADI, FATEMEH MOSALANEZHAD International Journal of Chemical Kinetics . 2012,第9期

机译：钴（II）席夫碱配合物对氯化三苯锡（IV）的给体性质：动力学研究
4. Thermal Stability and Kinetic Studies of New Cobalt(III) Complexes with a tetraazamacrocylic and Dithiocarbamate Ligands [C] . S.P. Sovilj, K. Babic-Samardzija, D.M. Minic, Third Yugoslav Materials Research Society Conference September 20-24, 1999 Held in Herceg-Novi, Yugoslavia. . 1999

机译：具有四氮杂大环和二硫代氨基甲酸酯配体的新型钴（III）配合物的热稳定性和动力学研究
5. Developing artificial proteases and nucleases: Catalytic hydrolysis of unactivated amides, nitriles and phosphates. Part~I. Hydrolysis of phosphate esters promoted by cobalt(III) complexes. Part~II. Hydration of nitriles catalyzed by cobalt(III) complexes. Part~III. Hydrolysis of amides promoted by cobalt(III) complexes. [D] . Kim, Jung Hee. 1992

机译：开发人造蛋白酶和核酸酶：催化水解未活化的酰胺，腈和磷酸盐。第一部分钴（III）配合物促进的磷酸酯的水解。第二部分钴（III）配合物催化的腈水合。第三部分钴（III）配合物促进的酰胺水解。
6. Synthesis and Characterization of trans-Dichlorotetrakis(imidazole)cobalt(III) Chloride: A New Cobalt(III) Coordination Complex with Potential Prodrug Properties [O] . Kaila F. Hart, Natalie S. Joe, Rebecca M. Miller, 2018

机译：反式二氯四咪唑钴（III）的合成和表征：具有潜在前药性质的新型钴（III）配合物
7. Amineanionogold(III) Complexes. IV. The Crystal Structure and Bromide Chloride Interchange Kinetics of trans-Diamminedibromidogold(III) Bromide. [O] . Karen Kaas, L. H. Skibsted, Aurel Marton, 1985

机译：Amineanionogold（III）复合物。 IV。晶体纤维素（III）溴化物的晶体结构和溴氯互换动力学。
8. Kinetic Study of the Oxygen-Transfer Reactions from the Oxo Diperoxo Complexes of Molybdenum(VI) and Tungsten(VI) to (Thiolato)- and (Sulfenato)cobalt(III) Complexes [R] . Ghiron, A. F., Thompson, R. C. 1988

机译：钼（VI）和钨（VI）与（硫代） - （sulfenato）钴（III）配合物的氧代二过氧配合物的氧转移反应动力学研究

Complexations of cobalt(II) with chloride and bromide, dissolution kinetics of cobaltous-oxide: Experimental studies and geological implications.

摘要

著录项

相似文献

相关主题

期刊订阅