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Journal articles on the topic 'Quaternary complexes'

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Published: 5 June 2025

Last updated: 1 August 2025

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1

V., Shankar, K. Mishra G., and Krishna V. "Multimetal multiligand complex formation equilibria of copper(II), nickel(II) and zinc(II) with L-2-amino-3-methylbutanoic acid (valine) and nitrilotriacetic acid." Journal of Indian Chemical Society Vol. 83, Jan 2006 (2006): 23–25. https://doi.org/10.5281/zenodo.5815119.

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Department of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh, India <em>Manuscript received 7 March 2005, revised 10 August 2005. accepted 29 August 2005</em> Formation equilibria of homo and heterobinuclear ternary/quaternary complexes of Cu<sup>II</sup> , Ni<sup>II</sup> and Zn<sup>II</sup> with nitrilotriacetic acid (A) and valine (B) ligands in aqueous solution have been investigated. Stability constants of the complexes and the complex formation equilibria at temperature 30 ± 1° and the ionic strength \(I \) = 0.1 M (NaNO<sub>3</sub>) h

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2

Gallicano, Keith D., and Norman L. Paddock. "Cyclotetraphosph(III)azanes: donor properties and ylide formation." Canadian Journal of Chemistry 63, no. 2 (1985): 314–18. http://dx.doi.org/10.1139/v85-052.

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The ligand (MeNPMe)4 (L) forms complexes [Formula: see text] [Formula: see text] L.M(CO)3 (M = Cr, Mo, W, Mn+), and a nickel complex L.Ni2(CO)3, which is easily oxidised to the phosphonimide [MeNP(0)Me]4. Quaternary complexes [LM(CO)3R]+I− have been prepared both by quaternisation of the neutral complex (R = Me, CH2CN, CH2C(O)NH2, M = Cr, Mo, W) and (R = Me) by reaction of the simple quaternary with the metal carbonyl. The quaternary complexes have been deprotonated to ylidic complexes, L.M(CO)3CH2 (M = Mo, W) in which the ylidic group has displaced one phosphine function. Chemical and structu

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3

S., S. Yadav, and S. Saxena R. "Formation constants and thermodynamic parameters of some tri-ligand complexes of lanthanides." Journal of Indian Chemical Society Vol. 86, Feb 2009 (2009): 168–70. https://doi.org/10.5281/zenodo.5807540.

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Department of Chemistry, Government Raza P.G College, Rampur-244 901, Uttar Pradesh, India <em>Manuscript received 30 June 2008, revised 15 October 2008, accepted 23 October 2008</em> Potentiometric evidences have been cited for the formation of 1 : 1 : 1 : 1; MLL'L<em>"</em> quaternary complexs [M<sup>III</sup> = La<sup>III</sup>, Pr<sup>III</sup> and Nd<sup>III</sup>, L = ethyleneglycol-bis(p-aminoethylether)-<em>N,N,N' ,N'</em>-tetraacetic acid (EGTA), L' = pyrldine-2,6-dicarboxylic acid (PDA) and L" = 2,2<em>'</em>-dithiodisalicylic acid (DTSA)

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4

Appolaire, Alexandre, Eric Girard, Matteo Colombo, et al. "Small-angle neutron scattering reveals the assembly mode and oligomeric architecture of TET, a large, dodecameric aminopeptidase." Acta Crystallographica Section D Biological Crystallography 70, no. 11 (2014): 2983–93. http://dx.doi.org/10.1107/s1399004714018446.

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The specific self-association of proteins into oligomeric complexes is a common phenomenon in biological systems to optimize and regulate their function. However,de novostructure determination of these important complexes is often very challenging for atomic-resolution techniques. Furthermore, in the case of homo-oligomeric complexes, or complexes with very similar building blocks, the respective positions of subunits and their assembly pathways are difficult to determine using many structural biology techniques. Here, an elegant and powerful approach based on small-angle neutron scattering is

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5

Surabhi, Sinha, Bartaria Divya, and Krishna V. "Solution equilibria of some quaternary metal complexes involving iminodiacetic acid and L-pyrrolidine-2-carboxylic acid." Journal of Indian Chemical Society Vol. 83, Jul 2006 (2006): 714–7. https://doi.org/10.5281/zenodo.5825126.

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Department ot Chemistry, university of Allahabad, Allahabad-211 002, Uttar Pradesh, Indta E mail vkrishna_,aIld@rediffmail com <em>Manuscript received 19 October 2005, revised 29 March 2006 accepted 3 April 2006</em> I quihbnum based computer studies on quaternary complex systems, viz Mn<sup>II</sup>/Co<sup>II</sup>Pb<sup>II</sup> iminodiacetic acid (IMDA = A l-) and L.-pyrrohdine-2-carboxylic acid (proline = B) systems demonstrate the formation of mixed-metal mixed-ligand complexes of storchiometry M<sup>1</sup>M<sup>2</sup>AB and M<sup>1</sup>M<sup>1</sup>A<sub>2</su

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6

Sharma, Sangita, Dipika Dalwadi, and Madhurjya Neog. "A study of the formation constants of ternary and quaternary complexes of some bivalent transition metals." Journal of the Serbian Chemical Society 75, no. 1 (2010): 75–82. http://dx.doi.org/10.2298/jsc1001075s.

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The formation of hetero-ligand 1:1:1, M(II)-Opda-Sal/Gly ternary and 1:1:1:1, M(II)-Opda-Sal-Gly quaternary complexes, where M(II) = Ni, Cu, Zn and Cd; Opda = o-phenylenediamine, Sal = salicylic acid, Gly = glycine, was studied pH-metrically in aqueous medium. The formation constants for the resulting ternary and quaternary complexes were evaluated at a constant ionic strength, ? = 0.20 mol dm-3 and temperature, 30?0.1 ?C. The order of the formation constants in terms of the metal ion for both type of complexes was found to be Cu(II) > Ni(II) > Zn(II) > Cd(II). This order was explaine

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7

Hao, Xao Xiu, Jie Meng, and Cheng Sun. "Study on Synthesis and Fluorescent Properties of Ternary and Quaternary Rare Earth Europium Complexes." Advanced Materials Research 380 (November 2011): 103–6. http://dx.doi.org/10.4028/www.scientific.net/amr.380.103.

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Synthesis and fluorescent properties of rare earth Rare earth complexes ultraviolet photochromic materials such as ternary and quaternary europium complexes were synthesized in this,we selected the high luminescent β-diketones such as α-thenoyltrifluoroacetone(HTTA),fine fragrant carboxylic acid and o-phenanthroline as ligands. The structure of the ternary and quaternary europium complexes were studied by IR spectrum, indicated that these complexes have bonded with the ligands. The fluorescent properties were studied systematically by fluorescence spectrophotometer, relative fluorescence inten

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8

Sliwa, Wanda, and Jerzy Peszke. "Inclusion Complexes Containing Quaternary Azaaromatic Moieties." HETEROCYCLES 71, no. 8 (2007): 1685. http://dx.doi.org/10.3987/rev-06-615.

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9

S., S. YADAV, and C. SHARMA R. "Formation Studies on Ternary and Quaternary Complexes of some Lanthanides." Journal of Indian Chemical Society Vol.71, Jan 1994 (1994): 9–11. https://doi.org/10.5281/zenodo.5890986.

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Department of Chemistry, Institute of Basic Sciences; Agra University, Khandari, Agra-282 002 Manuscript received 15 October 1992, revised 26 March 1993, accepted 30 April 1993 The formation of 1 : 1 : 1, Ln(iii)—PDA—NTA/FA ternary complexes and 1 : 1 : 1 : 1, Ln(III)—PDA—NTA—FA quaternary complexes, where Ln(III) = La, Pr and Nd; PDA = pyridine-2,6-dicarboxylic acid, NTA = nitrilotriacetic acid and FA = furan-2-carboxylic acid, has been studied potentiometrically. The formation constants for the resulting ternary and quaternary complexes have been evaluated

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10

Zhang, H., Y. Xiong, and D. Beach. "Proliferating cell nuclear antigen and p21 are components of multiple cell cycle kinase complexes." Molecular Biology of the Cell 4, no. 9 (1993): 897–906. http://dx.doi.org/10.1091/mbc.4.9.897.

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We have recently shown that two proteins, proliferating cell nuclear antigen (PCNA) and p21, are associated with cyclin D. Here we show that PCNA and p21 are common components of a wide variety of cyclin/cyclin-dependent kinase complexes in nontransformed cells. These include kinase complexes containing cyclin A, cyclin B, and cyclin D, associated either with CDC2, CDK2, CDK4, or CDK5. We show that PCNA and p21 form separate quaternary complex with each cyclin/CDK and that these quaternary complexes contain a substantial, if not major, fraction of the cell cycle kinases in asynchronously growi

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11

Shahverdiyeva, A. F., N. V. Salamova, and S. F. Ahmadbayova. "Study of the oil-collecting and oil-dispersing properties of quaternary ammonium salts formed by hexadecane and heptadecane acids with triethanolamine." Azerbaijan Oil Industry, no. 12 (December 15, 2024): 24–29. https://doi.org/10.37474/0365-8554/2024-12-24-29.

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At present, the wide application of surfactants in various fields such as detergents, foam and emulsion stabilizers, fluorogens, hydrophobizers, corrosion inhibitors makes their synthesis considered one of the urgent issues. The article presents the results of a study of the properties of quaternary ammonium salts of hexadecanoic and heptadecanoic acids, which are monobasic carboxylic acids, with triethanolamine (TEA) in distilled, drinking and sea water contaminated with Balakhany oil. The surface-active properties of products of various concentrations of these complexes were calculated using

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12

Janin, Joël, Ranjit P. Bahadur, and Pinak Chakrabarti. "Protein–protein interaction and quaternary structure." Quarterly Reviews of Biophysics 41, no. 2 (2008): 133–80. http://dx.doi.org/10.1017/s0033583508004708.

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AbstractProtein–protein recognition plays an essential role in structure and function. Specific non-covalent interactions stabilize the structure of macromolecular assemblies, exemplified in this review by oligomeric proteins and the capsids of icosahedral viruses. They also allow proteins to form complexes that have a very wide range of stability and lifetimes and are involved in all cellular processes. We present some of the structure-based computational methods that have been developed to characterize the quaternary structure of oligomeric proteins and other molecular assemblies and analyze

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13

Zhu, Xiaomeng, and Yangjiang Wei. "Few-weight quaternary codes via simplicial complexes." AIMS Mathematics 6, no. 5 (2021): 5124–32. http://dx.doi.org/10.3934/math.2021303.

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14

Sliwa, Wanda, Lidia Chrzastek, and Marian Mielniczak. "Host-Guest Complexes of Azaaromatic Quaternary Salts." HETEROCYCLES 36, no. 7 (1993): 1645. http://dx.doi.org/10.3987/rev-92-452.

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15

RAJESH, NAGAR, C. DWIVEDI P., and C. SHARMA R. "Studies on Quaternary Complexes of some Lanthanones." Journal of Indian Chemical Society Vol. 66, Jul 1989 (1989): 475–77. https://doi.org/10.5281/zenodo.6203745.

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Department of Chemistry, Institute of Basic Sciences, Agra University, Khandari  Agra-281 002 <em>Manuscript received 25 April 1988, revised 6 April 1989, accepted 17 May 1989</em> Studies on Quaternary Complexes of some Lanthanones

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16

Zheng, Xiaorui, Binke Ning, Chao Xue, et al. "Supramolecular platinum(ii) complexes with highly efficient monomer luminescence." Soft Matter 14, no. 24 (2018): 4893–97. http://dx.doi.org/10.1039/c8sm00624e.

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17

Chen, Di, Jun Han, Juncong Yang, David Schibli, Zhenzhong Zhang, and Christoph H. Borchers. "Supermolecule-assisted imaging of low-molecular-weight quaternary-ammonium compounds by MALDI-MS of their non-covalent complexes with cucurbit[7]uril." RSC Advances 10, no. 56 (2020): 34261–65. http://dx.doi.org/10.1039/d0ra04604c.

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18

A., S. GAHLAUT, CHATURVEDI BEENA, and C. SHARMA R. "Studies on Quaternary Complexes of some Rare Earth Metals." Journal of Indian Chemical Society Vol. 63, June 1986 (1986): 608–9. https://doi.org/10.5281/zenodo.6272222.

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Department of Chemistry, Agra University, Agra-282 004 <em>Manuscript received 23 September 1986, revised 25 March 1986, accepted 21 </em>April <em>1986</em> Studies on Quaternary Complexes of some Rare Earth Metals.

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19

Butcher, S., P. Hainaut, and J. Milner. "Increased salt concentration reversibly destabilizes p53 quaternary structure and sequence-specific DNA binding." Biochemical Journal 298, no. 3 (1994): 513–16. http://dx.doi.org/10.1042/bj2980513.

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Growth suppression by p53 correlates with sequence-specific DNA binding and is determined by tertiary and quaternary protein structures. Exposure to 300 mM NaCl did not affect p53 tertiary structure, but dissociated high-molecular-mass complexes with concomitant loss of specific DNA binding. Both effects were reversible. We conclude that high salt can reversibly destabilize the quaternary structure of p53 that is most efficient for sequence-specific DNA binding.

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20

A., S. GAHLAUT, C. DWlVEDI P., and C. SHARMA R. "Studies on Triligand Complexes of some Lanthanones." Journal of Indian Chemical Society Vol. 62, Sep 1985 (1985): 651–53. https://doi.org/10.5281/zenodo.6321985.

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Department of Chemistry, Agra University, Agra-282 004 <em>Manuscript received 26 November 1984, accepted 11 September 1986</em> The results of pH-metric studies on the formation of 1 : 1 : 1 : 1 MLL'L" quaternary complexes, where M-La<sup>III</sup>, Pr<sup>III</sup>, Nd<sup>III</sup> ; L =1,2-diatninocyclohexane-<em>N,N,N<sup>'</sup>,N'</em>- tetraacetic acid (CDTA) ; L'=1,2-dihydroxysuccinic acid (tartaric acid) ; and L" = 2- butenedioic acid (maleic acid), have been discussed in the present paper. The calculated values of formation constants and free ener

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21

Sevvana, Madhumati, and Richard Kuhn. "Quaternary epitope landscape of Zika virus antibody complexes." Microscopy and Microanalysis 27, S1 (2021): 1132–33. http://dx.doi.org/10.1017/s1431927621004256.

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22

Tan, Xiao-Feng, Xing Liu, Jian Zhou, Ligang Zhu, Rongqing Zhao, and Qian Huang. "Two Quaternary Copper Thiostannates with Lanthanum(III) Complexes." Journal of Cluster Science 27, no. 1 (2015): 257–65. http://dx.doi.org/10.1007/s10876-015-0927-1.

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23

RAMJEESINGH, Mohabir, Ling-Jun HUAN, Elizabeth GARAMI, and Christine E. BEAR. "Novel method for evaluation of the oligomeric structure of membrane proteins." Biochemical Journal 342, no. 1 (1999): 119–23. http://dx.doi.org/10.1042/bj3420119.

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Assessment of the quaternary structure of membrane proteins by PAGE has been problematic owing to their relatively poor solubility in non-dissociative detergents. Here we report that several membrane proteins can be readily solubilized in their native quaternary structure with the use of the detergent perfluoro-octanoic acid (PFO). Further, PFO can be used with PAGE, thereby providing a novel, accessible tool with which to assess the molecular mass of homo-multimeric protein complexes.

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24

Surabhi, Sinha, and Krishna V. "Multimetal multiligand complex formation equilibria of copper(II), nickel(II) and zinc(II) with iminodiacetic acid and L-pyrrolidine-2-carboxylic acid in aqueous solution." Journal of Indian Chemical Society Vol. 83, Jan 2006 (2006): 13–15. https://doi.org/10.5281/zenodo.5814603.

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Department of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh. India <em>E-mail </em>: vkprochem@yahoo.com <em>Manuscript received 3 November 2004, revised 18 July 2005, accepted 12 August 2005</em> Solution equilibria of homo and heterobinuclear complexes of cu<sup>ll</sup>, Ni<sup>ll</sup> and Zn<sup>ll</sup> with iminodiacetic acid (IMDA = A<sup>2</sup>-) and L-pyrrolidine-2-carboxylic acid (proline = B<sup>-</sup>)as ligands have been investigated by pH-measurements in an aqueous medium and relevant stability constants have been evaluated using computer technique. The

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25

Hagen, Susan E., Kun Liu, Yafei Jin, Lolita Piersimoni, Philip C. Andrews, and Hollis D. Showalter. "Synthesis of CID-cleavable protein crosslinking agents containing quaternary amines for structural mass spectrometry." Organic & Biomolecular Chemistry 16, no. 37 (2018): 8245–48. http://dx.doi.org/10.1039/c8ob00329g.

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Two novel cyclic quaternary amine crosslinking probes are synthesized for structural mass spectrometry of protein complexes in solution and for analysis of protein interactions in organellar and whole cell extracts.

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26

Zerkal, O. V., R. R. Gabdullin, and E. N. Samarin. "Problems of the quaternary geologyof the Crimean peninsula central part at the present time." Moscow University Bulletin. Series 4. Geology, no. 3 (June 28, 2017): 27–34. http://dx.doi.org/10.33623/0579-9406-2017-3-27-34.

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In the study of Quaternary deposits of the Crimea selected two phases. In the first stage (since the late XIX century to the sixties of XX century) stratigraphic description of the Quaternary strata was based on the allocation of terraced complexes (a marine terraces - in the coastal part and synchronous them alluvial ones - in continental part of the Crimean peninsula). In the second stage description of the Quaternary deposits is made on the basis of their climatic and stratigraphic dissection under the leading role of the loess-soil formation structure. The basis for stratigraphic subdivisi

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27

Zhang, Huaiying, Damla Keskin, Willy H. de Haan-Visser, Guangyue Zu, Patrick van Rijn, and Inge S. Zuhorn. "Aliphatic Quaternary Ammonium Functionalized Nanogels for Gene Delivery." Pharmaceutics 13, no. 11 (2021): 1964. http://dx.doi.org/10.3390/pharmaceutics13111964.

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Gene therapy is a promising treatment for hereditary diseases, as well as acquired genetic diseases, including cancer. Facing the complicated physiological and pathological environment in vivo, developing efficient non-viral gene vectors is needed for their clinical application. Here, poly(N-isopropylacrylamide) (p(NIPAM)) nanogels are presented with either protonatable tertiary amine groups or permanently charged quaternized ammonium groups to achieve DNA complexation ability. In addition, a quaternary ammonium-functionalized nanogel was further provided with an aliphatic moiety using 1-bromo

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28

Divya, Bartaria, P. Shukla V., and Krishna V. "Chemical speciation and thermodynamic stability of quaternary mixed chelates of bio-metals involving lysine, proline and uracil." Journal of Indian Chemical Society Vol. 86, Jan 2009 (2009): 9–13. https://doi.org/10.5281/zenodo.5807008.

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Department of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh, India <em>E-mail</em> : vkrishna111@gmail.com <em>Manuscript received 12 May 2008. revised 29 August 2008, accepted 9 September 2008</em> The metal-ligand formation constants of quaternary complexes of the type M<sub>1</sub>M<sub>2</sub>AB (where A = lysine/proline; B = uracil; M<sub>1</sub> = M<sub>2</sub> = Cu/Ni/Zn/Co) have been determined potentiometrically in biologically relevant conditions at constant ionic strength<em> I</em> = 0.1 <em>M </em>NaNO<sub>3</sub>. The overall stability constants have been e

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29

Liu, Jia-Li, Ze-Fan Zhu, and Feng Liu. "Cyanofluorination of vinyl ethers enabled by electron donor–acceptor complexes." Organic Chemistry Frontiers 6, no. 2 (2019): 241–44. http://dx.doi.org/10.1039/c8qo01143e.

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The reaction is operationally simple and conducted under ambient conditions, allowing the access to highly functionalized α-alkoxy-β-fluoronitriles bearing quaternary carbons that are difficult to access by existing methods.

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Faisal, Zelma, Sándor Kunsági-Máté, Beáta Lemli, et al. "Interaction of Dihydrocitrinone with Native and Chemically Modified Cyclodextrins." Molecules 24, no. 7 (2019): 1328. http://dx.doi.org/10.3390/molecules24071328.

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Citrinin (CIT) is a nephrotoxic mycotoxin produced by Aspergillus, Penicillium, and Monascus genera. It appears as a contaminant in grains, fruits, and spices. After oral exposure to CIT, its major urinary metabolite, dihydrocitrinone (DHC) is formed, which can be detected in human urine and blood samples. Cyclodextrins (CDs) are ring-shaped molecules built up from glucose units. CDs can form host-guest type complexes with several compounds, including mycotoxins. In this study, the complex formation of DHC with native and chemically modified beta- and gamma-cyclodextrins was tested at a wide p

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Jakobsen, Peter Roll. "Distribution and intensity of glaciotectonic deformation in Denmark." Bulletin of the Geological Society of Denmark 42 (February 1, 1996): 175–85. http://dx.doi.org/10.37570/bgsd-1995-42-14.

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Glaciotectonic deformation has a large impact on the stratigraphical and lithological variability of Quaternary deposits and the shallow subsurface pre-Quaternary sediments. Mapping of the distribution of glaciotectonic deformation involving pre-Quaternary and interglacial deposits has been carried out, and the density of glaciotectonic deformation analysed, on the basis of data from the well database ZEUS, at the Geological Survey of Denmark. Glaciotectonic deformation is widespread in Denmark. It is recognised in glacial terrains within morphological well-defined glaciotectonic complexes, an

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Bornschein, Russell E., and Brandon T. Ruotolo. "Ion mobility-mass spectrometry of charge-reduced protein complexes reveals general trends in the collisional ejection of compact subunits." Analyst 140, no. 20 (2015): 7020–29. http://dx.doi.org/10.1039/c5an01242b.

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Multiprotein complexes have been shown to play critical roles across a wide range of cellular functions, but most probes of protein quaternary structure are limited in their ability to analyze complex mixtures and polydisperse structures using small amounts of total protein.

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Zabielska-Matejuk, Jadwiga. "The influence of cation and anion structure of new quaternary ammonium salts on adsorption and leaching." Holzforschung 59, no. 2 (2005): 190–98. http://dx.doi.org/10.1515/hf.2005.030.

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Abstract This study examined the effect of cation and anion chemical structure of new quaternary ammonium and imidazolium compounds (QAC, bis-QAC, IC, bis-IC) on the adsorption onto Scots pine wood (Pinus sylvestris L.) and resistance to water leaching. The group of copper (II) modified QACs, containing copper-chloro-acetate complexes in the anion structure, was also examined. The length of alkyl hydrophobic substituents in the cation structure significantly influences adsorption. The adsorption characteristics were statistically related to the alkyl chain length of new quaternary ammonium sal

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Della Sala, Giorgio, Rosaria Schettini, Marina Sicignano, Francesco De Riccardis, and Irene Izzo. "Macrocyclic Hosts in Asymmetric Phase-Transfer Catalyzed Reactions." Synthesis 50, no. 24 (2018): 4777–95. http://dx.doi.org/10.1055/s-0037-1610311.

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The introduction and development of neutral macrocyclic hosts capable of complexing ions within their pre-organized cavity, has been of utmost importance in supramolecular chemistry. Their ability to form stable organic-soluble metal–macrocycle complexes opened up the way to their application in phase-transfer catalysis (PTC) as a viable alternative to quaternary onium salts. In particular, their conformationally rigid preorganized backbone, accommodating organic substrates in defined orientations, promotes highly efficient stereoselective reactions. This short review summarizes the applicatio

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Degtyarev, Andrey, Alexandra Trishina, and Dariya Rostova. "Theoretical investigation of the interaction mechanism of trialkylamine derivatives with the copper phthalocyanine surface." Journal of Advanced Materials and Technologies 10, no. 2 (2025): 141–53. https://doi.org/10.17277/jamt-2025-10-02-141-153.

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The paper presents a theoretical study of the sorption mechanisms of tripropylamine, triisopropylamine, trihydroxypropylamines, and tetrapropylammonium chloride on the surface of copper phthalocyanine containing a metal atom, using density functional theory. The critical points of QTAIM, IRI, and charge distributions in sorbate-sorbent complexes were analyzed to investigate the interaction mechanism between the sorbate molecule and the surface. It was found that trialkylamines exhibit a higher binding energy with the surface than trialkylaminoalcohols due to their lower interaction energy with

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Chandola, Himanshu, Tim E. Williamson, Bruce A. Craig, Alan M. Friedman, and Chris Bailey-Kellogg. "Stoichiometries and affinities of interacting proteins from concentration series of solution scattering data: decomposition by least squares and quadratic optimization." Journal of Applied Crystallography 47, no. 3 (2014): 899–914. http://dx.doi.org/10.1107/s1600576714005913.

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In studying interacting proteins, complementary insights are provided by analyzing both the association model (the stoichiometry and affinity constants of the intermediate and final complexes) and the quaternary structure of the resulting complexes. Many current methods for analyzing protein interactions either give a binary answer to the question of association and no information about quaternary structure or at best provide only part of the complete picture. Presented here is a method to extract both types of information from X-ray or neutron scattering data for a series of equilibrium mixtu

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Cheng, Fengchang, Wenxin Lu, Wei Huang, Lu Wen, Mingfeng Li, and Fanke Meng. "Cu-catalyzed enantioselective synthesis of tertiary benzylic copper complexes and their in situ addition to carbonyl compounds." Chemical Science 9, no. 22 (2018): 4992–98. http://dx.doi.org/10.1039/c8sc00827b.

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Catalytic chemo- and enantioselective generation of tertiary benzylic copper complexes from Cu–B(pin) (pin = pinacolato) additions to 1,1-disubstituted alkenes followed by in situ reactions with ketones and carboxylic acid phenol esters to construct multifunctional alkylboron compounds that contain quaternary stereogenic centers is presented.

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Durnikin, D. A., A. V. Matsyura та K. Jankowski. "ОСНОВНЫЕ ЭТАПЫ РАЗВИТИЯ ПРЕДСТАВИТЕЛЕЙ РОДА POTAMOGETON L. (POTAMOGETONACEAE) ВО ФЛОРАХ ВОДОЕМОВ ЗАПАДНОЙ СИБИРИ В КАЙНОЗОЕ ПО ПАЛЕОКАРПОЛОГИЧЕСКИМ И ПАЛИНОЛОГИЧЕСКИМ ДАННЫМ". Biological Bulletin of Bogdan Chmelnitskiy Melitopol State Pedagogical University 6, № 2 (2016): 45–60. http://dx.doi.org/10.15421/201634.

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<p>Palaeobotanical, geomorphological, and paleogeographical data on flora of reservoirs are presented. The structured materials on geomorphology and paleogeography from Paleogene, Neogene and Quaternary deposits of Western Siberia are reported. The stratigraphic complexes linked to tectonic zoning Kulunda and southern Baraba Lowlands are analyzed. The data on the structure-formational zones, distinguished by time of inception, the composition and thickness of the sediments, and nature of the neotectonics are presented. The analysis of paleocarpology and palynology data from the <em&gt

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Matyushkina, Yulia I., and Alexandr A. Shabarin. "EXTRACTION OF ANIONIC CADMIUM COMPLEXES WITH ORGANIC SOLUTIONS OF QUATERNARY AMMONIUM SALTS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 10 (2020): 30–35. http://dx.doi.org/10.6060/ivkkt.20206310.6224.

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The anion-exchange extraction of thiocyanate, chloride and iodide cadmium complexes by solutions of quaternary ammonium salts chlorides in organic solvents (toluene, carbon tetrachloride, ethyl acetate, isobutyl alcohol, nitrobenzene) was studied. Extraction involves solutions of alkyl dimethylbenzylammonium chlorides (R-N+(CH3)2-CH2C6H5-Cl-) and alkyl dimethylethyl-benzylammonium (R-N+(CH3)2-CH2-CH2C6H5-Cl-), where R is a straight alkyl chain, mainly C12 - C14. The composition of the cadmium anionic complexes was established by the analysis of the calibration curves E = f (pCCd (II)) construc

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Carac, Andreea, Rica Boscencu, Geta Carac, and Simona Gabriela Bungau. "Spectral Study of Some Lanthanides Complexes with Quaternary Pyridinium Ligands." Revista de Chimie 68, no. 10 (2017): 2265–69. http://dx.doi.org/10.37358/rc.17.10.5868.

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Some lanthanides complexes with two N-heterocyclic ligands derived from 4,4`-bipyridinium and 1,2-bis-(4-pyridinium) ethane (noted BP and BPE) were studied in presence of triethylamine and methanol in view of their application as cytotoxic agents. Absorption spectra have been recorded by UV-Vis spectroscopy during the complexation process in solution. The ligands demonstrate preferential arrangements in lanthanide�s electronic structure which is identified much clearly in ultraviolet range. La(III)-BP solution indicates absorption at lmax= 206 nm while La(III)-BPE at lmax of 208 nm. The soluti

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Perica, Tina, Joseph A. Marsh, Filipa L. Sousa, et al. "The emergence of protein complexes: quaternary structure, dynamics and allostery." Biochemical Society Transactions 40, no. 3 (2012): 475–91. http://dx.doi.org/10.1042/bst20120056.

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All proteins require physical interactions with other proteins in order to perform their functions. Most of them oligomerize into homomers, and a vast majority of these homomers interact with other proteins, at least part of the time, forming transient or obligate heteromers. In the present paper, we review the structural, biophysical and evolutionary aspects of these protein interactions. We discuss how protein function and stability benefit from oligomerization, as well as evolutionary pathways by which oligomers emerge, mostly from the perspective of homomers. Finally, we emphasize the spec

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Sheinkman, V. S. "The problem of absolute dating of Siberia’s Quaternary geomorphological complexes." Geography and Natural Resources 34, no. 4 (2013): 314–22. http://dx.doi.org/10.1134/s1875372813040033.

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Hayashi, Nobuyuki, and Tomomi Ujihara. "‘Biting effect’ stabilizing gallate-type catechin/quaternary ammonium ion complexes." Tetrahedron 63, no. 39 (2007): 9802–9. http://dx.doi.org/10.1016/j.tet.2007.07.003.

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Baranwal, B. P., A. K. Jain, A. Varma, A. K. Singh, and T. Fatma. "Photoluminescent nano-sized ternary and quaternary complexes of thorium(IV)." Radiochimica Acta 99, no. 5 (2011): 261–67. http://dx.doi.org/10.1524/ract.2011.1825.

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Wang, DongMei, WenBo Cao, and Jian Fan. "Synthesis and luminescence properties of the europium quaternary complexes nanoparticles." Science China Chemistry 57, no. 6 (2014): 791–96. http://dx.doi.org/10.1007/s11426-013-5039-x.

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SLIWA, W., L. CHRZASTEK, and M. MIELNICZAK. "ChemInform Abstract: Host-Guest Complexes of Aza Aromatic Quaternary Salts." ChemInform 24, no. 39 (2010): no. http://dx.doi.org/10.1002/chin.199339353.

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Lu, Ying, Zhong Sun, and Mingxin Huo. "Fabrication of a micellar heteropolyacid with Lewis–Brønsted acid sites and application for the production of 5-hydroxymethylfurfural from saccharides in water." RSC Advances 5, no. 39 (2015): 30869–76. http://dx.doi.org/10.1039/c4ra16952b.

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Supramolecular complexes (C<sub>n</sub>H<sub>2n+1</sub>N(CH<sub>3</sub>)<sub>3</sub>)H<sub>4</sub>PW<sub>11</sub>TiO<sub>40</sub> (n = 4, 8, 12, 14, 16, and 18) consisting of heteropolyacids (HPAs) and amphiphilic quaternary ammonium were fabricated through self-assembly.

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Gray, JE, SA Maclean, and VC Reinsborough. "Limitations of the Phenolphthalein Competition Method for Estimating Cyclodextrin Binding Constants." Australian Journal of Chemistry 48, no. 3 (1995): 551. http://dx.doi.org/10.1071/ch9950551.

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The phenolphthalein competitive spectrophotometric technique was used to obtain binding constants for cyclodextrin complexes for a variety of both inclusates and cyclodextrins . The former included alkane-1-sulfonates (C5-C12), alkyl sulfates (C6, C8, C12) and several heterocyclic ligands, and the latter included β-cyclodextrin, dimethyl-β-cyclodextrin and γ- cyclodextrin . The technique was not successful for either α- cyclodextrin or trimethyl -β- cyclodextrin inclusion complexes, or with many primary amines and quaternary ammonium cationic surfactants. However, for many colourless inclusate

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Nielsen, Tove, Anders Mathiesen, and Malene Bryde-Auken. "Base Quaternary in the Danish parts of the North Sea and Skagerrak." Geological Survey of Denmark and Greenland (GEUS) Bulletin 15 (July 10, 2008): 37–40. http://dx.doi.org/10.34194/geusb.v15.5038.

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Over the years, several maps of the base Quaternary surface of the Danish area have been published. However, the maps have either been local in character (e.g. Håkansson & Pedersen 1992; Huuse et al. 2001) or have concentrated on special topics such as tunnel valleys (e.g. Huuse & Lykke-Andersen 2000) or glaciotectonic features (e.g. Klint & Pedersen 1995; And- ersen et al. 2005). The only published map of a more regional character is that of Binzer & Stockmarr (1994) that covers onshore Denmark and eastern Danish waters. Here we present for the first time a regional map of the

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Cheremnykh, A. V., and I. A. Dekabryov. "TECTONIC STRESSES IN THE CHERSKY FAULT ZONE (BAIKAL RIFT SYSTEM." Geodynamics & Tectonophysics 14, no. 5 (2023): 0722. http://dx.doi.org/10.5800/gt-2023-14-5-0722.

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Based on the kinematic and structural-paragenetic approaches, there were performed the reconstructions of tectonic stresses in the Chersky fault zone. Rank analysis as applied to specialized mapping of fault zones was made for heterochronous rock complexes: Paleozoic, Upper Oligocene – Lower Pliocene and Upper Pliocene – Quaternary. There are distinguished three regional stress fields: Pre-Cenozoic compressive stress field with the NW-SE striking principal axis and two Cenozoic tensile stress fields with different axial orientations. The Cenozoic tensile stress field with a sub-meridionally st

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