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Pereira RW, Ramabhadran RO. Accurate Computation of Aqueous p Kas of Biologically Relevant Organic Acids: Overcoming the Challenges Posed by Multiple Conformers, Tautomeric Equilibria, and Disparate Functional Groups with the Fully Black-Box p K-Yay Method. J Phys Chem A 2023; 127:9121-9138. [PMID: 37862610 DOI: 10.1021/acs.jpca.3c02977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2023]
Abstract
The use of static electronic structure calculations to compute solution-phase pKas offers a great advantage in that a macroscopic bulk property could be computed via microscopic computations involving very few molecules. There are various sources of errors in the quantum chemical calculations though. Overcoming these errors to accurately compute pKas of a plethora of acids is an active area of research in physical chemistry pursued by both computational as well as experimental chemists. We recently developed the pK-Yay method in our attempt to accurately compute aqueous pKas of strong and weak acids. The method is fully black-box, computationally inexpensive, and is very easy for even a nonexpert to use. However, the method was thus far tested on very few molecules (only 16 in all). Herein, in order to assess the future applicability of pK-Yay, we study the effect of multiple conformers, the presence of tautomers under equilibrium, and the impact of a wide variety of functional groups (derivatives of acetic acid with substituents at various positions, dicarboxylic acids, aromatic carboxylic acids, amines and amides, phenols and thiols, and fluorine bearing organic acids). Starting with more than 1000 conformers and tautomers, this study establishes that overall errors of ∼ 1.0 pKa units are routinely obtained for a majority of the molecules. Larger errors are noted in cases where multiple charges, intramolecular hydrogen bonding, and several ionizable functional groups are simultaneously present. An important conclusion to emerge from this work is that, the computed pKas are insensitive (difference <0.5) to whether we consider multiple conformers/tautomers or only choose the most stable conformer/tautomer. Further, pK-Yay captures the stereoelectronic effects arising due to differing axial vs equatorial pattern, and is useful to predict the dominant acid-base equilibrium in a system featuring several equilibria. Overall, pK-Yay may be employed in several chemical applications featuring organic molecules and biomonomers.
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Affiliation(s)
- Roshni W Pereira
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati, Andhra Pradesh 517507, India
- Centre for Atomic Molecular Optical Sciences and Technology (CAMOST), Tirupati, Andhra Pradesh 517507, India
| | - Raghunath O Ramabhadran
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Tirupati, Andhra Pradesh 517507, India
- Centre for Atomic Molecular Optical Sciences and Technology (CAMOST), Tirupati, Andhra Pradesh 517507, India
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Soldevila-Barreda JJ, Azmanova M, Pitto-Barry A, Cooper PA, Shnyder SD, Barry NPE. Preclinical Anticancer Activity of an Electron-Deficient Organoruthenium(II) Complex. ChemMedChem 2020; 15:982-987. [PMID: 32237195 DOI: 10.1002/cmdc.202000096] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Indexed: 01/24/2023]
Abstract
Ruthenium compounds have been shown to be promising alternatives to platinum(II) drugs. However, their clinical success depends on achieving mechanisms of action that overcome Pt-resistance mechanisms. Electron-deficient organoruthenium complexes are an understudied class of compounds that exhibit unusual reactivity in solution and might offer novel anticancer mechanisms of action. Here, we evaluate the in vitro and in vivo anticancer properties of the electron-deficient organoruthenium complex [(p-cymene)Ru(maleonitriledithiolate)]. This compound is found to be highly cytotoxic: 5 to 60 times more potent than cisplatin towards ovarian (A2780 and A2780cisR), colon (HCT116 p53+/+ and HCT116 p53-/-), and non-small cell lung H460 cancer cell lines. It shows no cross-resistance and is equally cytotoxic to both A2780 and A2780cisR cell lines. Furthermore, unlike cisplatin, the remarkable in vitro antiproliferative activity of this compound appears to be p53-independent. In vivo evaluation in the hollow-fibre assay across a panel of cancer cell types and subcutaneous H460 non-small cell lung cancer xenograft model hints at the activity of the complex. Although the impressive in vitro data are not fully corroborated by the in vivo follow-up, this work is the first preclinical study of electron-deficient half-sandwich complexes and highlights their promise as anticancer drug candidates.
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Affiliation(s)
| | - Maria Azmanova
- School of Chemistry and Biosciences, University of Bradford, Bradford, BD7 1DP, UK
| | - Anaïs Pitto-Barry
- School of Chemistry and Biosciences, University of Bradford, Bradford, BD7 1DP, UK
| | - Patricia A Cooper
- Institute of Cancer Therapeutics, University of Bradford, Bradford, BD7 1DP, UK
| | - Steven D Shnyder
- Institute of Cancer Therapeutics, University of Bradford, Bradford, BD7 1DP, UK
| | - Nicolas P E Barry
- School of Chemistry and Biosciences, University of Bradford, Bradford, BD7 1DP, UK
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3
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Precious metal N-heterocyclic carbene-carbaboranyl complexes: Cytotoxic and selective compounds for the treatment of cancer. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2019.121062] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Azmanova M, Soldevila-Barreda J, Bani Hani H, Lord RM, Pitto-Barry A, Picksley SM, Barry NPE. Anticancer Activity of Electron-Deficient Metal Complexes against Colorectal Cancer in vitro Models. ChemMedChem 2019; 14:1887-1893. [PMID: 31545555 DOI: 10.1002/cmdc.201900528] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 09/17/2019] [Indexed: 11/12/2022]
Abstract
An evaluation of the in vitro cytotoxicity of nine electron-deficient half-sandwich metal complexes towards two colorectal cancer cell lines (HCT116 p53+/+, HCT116 p53-/-) and one normal prostate cell line (PNT2) is presented herein. Three complexes were found to be equally cytotoxic towards both colorectal cancer cell lines, suggesting a p53-independent mechanism of action. These complexes are 12 to 34× more potent than cisplatin against HCT116 p53+/+ and HCT116 p53-/- cells. Furthermore, they were found to exhibit little or no cytotoxicity towards PNT2 normal cells, with selectivity ratios greater than 50. To gain an insight into the potential mechanisms of action of the most active compounds, their effects on the expression levels of a panel of genes were measured using qRT-PCR against treated HCT116 p53+/+ and HCT116 p53-/- cells, and cell-cycle analysis was carried out.
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Affiliation(s)
- Maria Azmanova
- School of Chemistry and Biosciences, University of Bradford, Richmond Road, BD7 1DP, Bradford, UK
| | - Joan Soldevila-Barreda
- School of Chemistry and Biosciences, University of Bradford, Richmond Road, BD7 1DP, Bradford, UK
| | - Hira Bani Hani
- School of Chemistry and Biosciences, University of Bradford, Richmond Road, BD7 1DP, Bradford, UK
| | - Rianne M Lord
- School of Chemistry and Biosciences, University of Bradford, Richmond Road, BD7 1DP, Bradford, UK
| | - Anaïs Pitto-Barry
- School of Chemistry and Biosciences, University of Bradford, Richmond Road, BD7 1DP, Bradford, UK
| | - Steven M Picksley
- School of Chemistry and Biosciences, University of Bradford, Richmond Road, BD7 1DP, Bradford, UK
| | - Nicolas P E Barry
- School of Chemistry and Biosciences, University of Bradford, Richmond Road, BD7 1DP, Bradford, UK
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Pitto-Barry A, Barry NPE. Controlled Release of Carbon Monoxide from a Pseudo Electron-Deficient Organometallic Complex. ACS OMEGA 2018; 3:15623-15627. [PMID: 30533578 PMCID: PMC6275942 DOI: 10.1021/acsomega.8b02154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 10/30/2018] [Indexed: 06/09/2023]
Abstract
A 16-electron iridium organometallic is reacted with carbon monoxide to form an 18-electron CO-adduct. This CO-adduct is stable for weeks in the solid state, but quickly reverts to its parent 16-e complex in tetrahydrofuran solution, releasing CO(g). Using a simple methodology, we show that this gas can subsequently be used to perform a carbonylation reaction on another molecule.
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Pitto-Barry A, Lupan A, Ellingford C, Attia AAA, Barry NPE. New Class of Hybrid Materials for Detection, Capture, and "On-Demand" Release of Carbon Monoxide. ACS APPLIED MATERIALS & INTERFACES 2018; 10:13693-13701. [PMID: 29652472 DOI: 10.1021/acsami.8b01776] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Carbon monoxide (CO) is both a substance hazardous to health and a side product of a number of industrial processes, such as methanol steam reforming and large-scale oxidation reactions. The separation of CO from nitrogen (N2) in industrial processes is considered to be difficult because of the similarities of their electronic structures, sizes, and physicochemical properties (e.g., boiling points). Carbon monoxide is also a major poison in fuel cells because of its adsorption onto the active sites of the catalysts. It is therefore of the utmost economic importance to discover new materials that enable effective CO capture and release under mild conditions. However, methods to specifically absorb and easily release CO in the presence of contaminants, such as water, nitrogen, carbon dioxide, and oxygen, at ambient temperature are not available. Here, we report the simple and versatile fabrication of a new class of hybrid materials that allows capture and release of carbon monoxide under mild conditions. We found that carborane-containing metal complexes encapsulated in networks made of poly(dimethylsiloxane) react with CO, even when immersed in water, leading to dramatic color and infrared signature changes. Furthermore, we found that the CO can be easily released from the materials by simply dipping the networks into an organic solvent for less than 1 min, at ambient temperature and pressure, which not only offers a straightforward recycling method, but also a new method for the "on-demand" release of carbon monoxide. We illustrated the utilization of the on-demand release of CO from the networks by carrying out a carbonylation reaction on an electron-deficient metal complex that led to the formation of the CO-adduct, with concomitant recycling of the gel. We anticipate that our sponge-like materials and scalable methodology will open up new avenues for the storage, transport, and controlled release of CO, the silent killer and a major industrial poison.
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Affiliation(s)
- Anaïs Pitto-Barry
- School of Chemistry and Biosciences , University of Bradford , Bradford BD7 1DP , United Kingdom
| | - Alexandru Lupan
- Facultatea de Chimie şi Inginerie Chimică , Universitatea Babeş-Bolyai , Cluj-Napoca 400084 , Romania
| | - Christopher Ellingford
- International Institute for Nanocomposites Manufacturing , WMG , Coventry CV4 7AL , United Kingdom
| | - Amr A A Attia
- Facultatea de Chimie şi Inginerie Chimică , Universitatea Babeş-Bolyai , Cluj-Napoca 400084 , Romania
| | - Nicolas P E Barry
- School of Chemistry and Biosciences , University of Bradford , Bradford BD7 1DP , United Kingdom
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Zhang J, Pitto-Barry A, Shang L, Barry NPE. Anti-inflammatory activity of electron-deficient organometallics. ROYAL SOCIETY OPEN SCIENCE 2017; 4:170786. [PMID: 29291071 PMCID: PMC5717645 DOI: 10.1098/rsos.170786] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 10/26/2017] [Indexed: 05/14/2023]
Abstract
We report an evaluation of the cytotoxicity of a series of electron-deficient (16-electron) half-sandwich precious metal complexes of ruthenium, osmium and iridium ([Os/Ru(η6-p-cymene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)] (1/2), [Ir(η5-pentamethylcyclopentadiene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)] (3), [Os/Ru(η6-p-cymene)(benzene-1,2-dithiolato)] (4/5) and [Ir(η5-pentamethylcyclopentadiene)(benzene-1,2-dithiolato)] (6)) towards RAW 264.7 murine macrophages and MRC-5 fibroblast cells. Complexes 3 and 6 were found to be non-cytotoxic. The anti-inflammatory activity of 1-6 was evaluated in both cell lines after nitric oxide (NO) production and inflammation response induced by bacterial endotoxin lipopolysaccharide (LPS) as the stimulus. All metal complexes were shown to exhibit dose-dependent inhibitory effects on LPS-induced NO production on both cell lines. Remarkably, the two iridium complexes 3 and 6 trigger a full anti-inflammatory response against LPS-induced NO production, which opens up new avenues for the development of non-cytotoxic anti-inflammatory drug candidates with distinct structures and solution chemistry from that of organic drugs, and as such with potential novel mechanisms of action.
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Affiliation(s)
| | | | - Lijun Shang
- Authors for correspondence: Lijun Shang e-mail:
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Pitto-Barry A, Lupan A, Zegke M, Swift T, Attia AAA, Lord RM, Barry NPE. Pseudo electron-deficient organometallics: limited reactivity towards electron-donating ligands. Dalton Trans 2017; 46:15676-15683. [DOI: 10.1039/c7dt02827j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This work presents the unusual reactivity of a family of electron-deficient half-sandwich metal complexes.
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Affiliation(s)
- Anaïs Pitto-Barry
- School of Chemistry and Biosciences
- University of Bradford
- Bradford BD7 1DP
- UK
| | - Alexandru Lupan
- Facultatea de Chimie şi Inginerie Chimică
- Universitatea Babeş-Bolyai
- Cluj-Napoca
- Romania
| | - Markus Zegke
- School of Chemistry and Biosciences
- University of Bradford
- Bradford BD7 1DP
- UK
| | - Thomas Swift
- School of Chemistry and Biosciences
- University of Bradford
- Bradford BD7 1DP
- UK
| | - Amr A. A. Attia
- Facultatea de Chimie şi Inginerie Chimică
- Universitatea Babeş-Bolyai
- Cluj-Napoca
- Romania
| | - Rianne M. Lord
- School of Chemistry and Biosciences
- University of Bradford
- Bradford BD7 1DP
- UK
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Tsolis T, Papavasileiou KD, Divanis SA, Melissas VS, Garoufis A. How half sandwich ruthenium compounds interact with DNA while not being hydrolyzed; a comparative study. J Inorg Biochem 2016; 160:12-23. [PMID: 27118026 DOI: 10.1016/j.jinorgbio.2016.04.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Revised: 03/17/2016] [Accepted: 04/03/2016] [Indexed: 01/07/2023]
Affiliation(s)
- Theodoros Tsolis
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Ioannina, GR-451 10 Ioannina, Greece
| | - Konstantinos D Papavasileiou
- Institute of Biology, Pharmaceutical Chemistry and Biotechnology, National Hellenic Research Foundation, 48 Vas. Constantinou Ave., GR-116 35 Athens, Greece
| | - Spyridon A Divanis
- Section of Physical Chemistry, Department of Chemistry, University of Ioannina, GR-451 10 Ioannina, Greece
| | - Vasilios S Melissas
- Section of Physical Chemistry, Department of Chemistry, University of Ioannina, GR-451 10 Ioannina, Greece
| | - Achilleas Garoufis
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Ioannina, GR-451 10 Ioannina, Greece.
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Yao ZJ, Deng W. Half-sandwich late transition metal complexes based on functionalized carborane ligands. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.10.008] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pitto-Barry A, South A, Rodger A, Barry NPE. The synthesis and unexpected solution chemistry of thermochromic carborane-containing osmium half-sandwich complexes. Dalton Trans 2016; 45:1763-8. [DOI: 10.1039/c5dt04398k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The functionalisation of the 16-electron complex [Os(η6-p-cymene)(1,2-dicarba-closo-dodecarborane-1,2-dithiolato)] (1) with a series of Lewis bases to give the corresponding 18-electron complexes is reported.
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Affiliation(s)
| | - Amy South
- Department of Chemistry
- University of Warwick
- Coventry CV4 7AL
- UK
| | - Alison Rodger
- Department of Chemistry
- University of Warwick
- Coventry CV4 7AL
- UK
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Romero-Canelón I, Phoenix B, Pitto-Barry A, Tran J, Soldevila-Barreda JJ, Kirby N, Green S, Sadler PJ, Barry NP. Arene ruthenium dithiolato–carborane complexes for boron neutron capture therapy (BNCT). J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.05.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Tsolis T, Manos MJ, Karkabounas S, Zelovitis I, Garoufis A. Synthesis, X-ray structure determination, cytotoxicity and interactions with 9-methylguanine, of ruthenium(II) η6-arene complexes. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2014.06.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Barry NPE, Kemp TF, Sadler PJ, Hanna JV. A multinuclear1H,13C and11B solid-state MAS NMR study of 16- and 18-electron organometallic ruthenium and osmium carborane complexes. Dalton Trans 2014; 43:4945-9. [DOI: 10.1039/c3dt53589d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Oxidation of 1,3,2-diselenaphospholanes with an annelated dicarba-closo-dodecaborane(12) unit by addition of sulfur and selenium. Molecular structure of a novel 1,2,4,5-tetraselena-3-phospha heterocycle. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.03.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Barry NPE, Sadler PJ. Exploration of the medical periodic table: towards new targets. Chem Commun (Camb) 2013; 49:5106-31. [DOI: 10.1039/c3cc41143e] [Citation(s) in RCA: 570] [Impact Index Per Article: 51.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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