1
|
Babijczuk K, Berdzik N, Nowak D, Warżajtis B, Rychlewska U, Starzyk J, Mrówczyńska L, Jasiewicz B. Novel C3-Methylene-Bridged Indole Derivatives with and without Substituents at N1: The Influence of Substituents on Their Hemolytic, Cytoprotective, and Antimicrobial Activity. Int J Mol Sci 2024; 25:5364. [PMID: 38791402 PMCID: PMC11121452 DOI: 10.3390/ijms25105364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/09/2024] [Accepted: 05/10/2024] [Indexed: 05/26/2024] Open
Abstract
Alkaloids are natural compounds useful as scaffolds for discovering new bioactive molecules. This study utilized alkaloid gramine to synthesize two groups of C3-substituted indole derivatives, which were either functionalized at N1 or not. The compounds were characterized by spectroscopic methods. The protective effects of the new compounds against in vitro oxidative hemolysis induced by standard oxidant 2,2'-azobis(2-amidinopropane dihydro chloride (AAPH) on human erythrocytes as a cell model were investigated. Additionally, the compounds were screened for antimicrobial activity. The results indicated that most of the indole derivatives devoid of the N1 substitution exhibited strong cytoprotective properties. The docking studies supported the affinities of selected indole-based ligands as potential antioxidants. Furthermore, the derivatives obtained exhibited potent fungicidal properties. The structures of the eight derivatives possessing indole moiety bridged to the imidazole-, benzimidazole-, thiazole-, benzothiazole-, and 5-methylbenzothiazoline-2-thiones were determined by X-ray diffraction. The C=S bond lengths in the thioamide fragment pointed to the involvement of zwitterionic structures of varying contribution. The predominance of zwitterionic mesomers may explain the lack of cytoprotective properties, while steric effects, which limit multiple the hydrogen-bond acceptor properties of a thione sulfur, seem to be responsible for the high hemolytic activity.
Collapse
Affiliation(s)
- Karolina Babijczuk
- Department of Bioactive Products, Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (K.B.); (N.B.)
| | - Natalia Berdzik
- Department of Bioactive Products, Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (K.B.); (N.B.)
| | - Damian Nowak
- Department of Quantum Chemistry, Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland;
| | - Beata Warżajtis
- Department of Crystallography, Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (B.W.); (U.R.)
| | - Urszula Rychlewska
- Department of Crystallography, Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (B.W.); (U.R.)
| | - Justyna Starzyk
- Department of Soil Science and Microbiology, Faculty of Agronomy, Horticulture, and Bioengineering, University of Life Science, Szydłowska 50, 60-656 Poznań, Poland;
| | - Lucyna Mrówczyńska
- Department of Cell Biology, Faculty of Biology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 6, 61-614 Poznań, Poland;
| | - Beata Jasiewicz
- Department of Bioactive Products, Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (K.B.); (N.B.)
| |
Collapse
|
2
|
Directing cation-cation interactions in thiamine compounds: Analysis of a series of organic salts based on vitamin B1. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130046] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
3
|
Sepehri N, Iraji A, Yavari A, Asgari MS, Zamani S, Hosseini S, Bahadorikhalili S, Pirhadi S, Larijani B, Khoshneviszadeh M, Hamedifar H, Mahdavi M, Khoshneviszadeh M. The natural-based optimization of kojic acid conjugated to different thio-quinazolinones as potential anti-melanogenesis agents with tyrosinase inhibitory activity. Bioorg Med Chem 2021; 36:116044. [DOI: 10.1016/j.bmc.2021.116044] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 01/09/2021] [Accepted: 01/20/2021] [Indexed: 01/13/2023]
|
4
|
Sisodia N, Miranda M, McGuinness KL, Wadhawan JD, Lawrence NS. Intra‐ and Inter‐molecular Sulf‐ hydryl Hydrogen Bonding: Facilitating Proton Transfer Events for Determination of pH in Sea Water. ELECTROANAL 2020. [DOI: 10.1002/elan.202060332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Neel Sisodia
- ANB Sensors Ltd. 4 Penn Farm Haslingfield Cambridge CB23 1JZ United Kingdom
| | - Monica Miranda
- ANB Sensors Ltd. 4 Penn Farm Haslingfield Cambridge CB23 1JZ United Kingdom
| | - Kay L. McGuinness
- ANB Sensors Ltd. 4 Penn Farm Haslingfield Cambridge CB23 1JZ United Kingdom
| | - Jay D. Wadhawan
- Department of Chemical Engineering The University of Hull Cottingham Road Hull HU6 7RX United Kingdom
| | - Nathan S. Lawrence
- ANB Sensors Ltd. 4 Penn Farm Haslingfield Cambridge CB23 1JZ United Kingdom
| |
Collapse
|
5
|
Andersson Å, Poline M, Kodambattil M, Rebrov O, Loire E, Maître P, Zhaunerchyk V. Structure of Proton-Bound Methionine and Tryptophan Dimers in the Gas Phase Investigated with IRMPD Spectroscopy and Quantum Chemical Calculations. J Phys Chem A 2020; 124:2408-2415. [PMID: 32106670 PMCID: PMC7307929 DOI: 10.1021/acs.jpca.9b11811] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
![]()
The
structures of three proton-bound dimers (Met2H+, MetTrpH+, and Trp2H+) are
investigated in the gas phase with infrared multiple photon disassociation
(IRMPD) spectroscopy in combination with quantum chemical calculations.
Their IRMPD spectra in the range of 600–1850 cm–1 are obtained experimentally using an FT-ICR mass spectrometer and
the CLIO free electron laser as an IR light source. The most abundant
conformers are elucidated by comparing the IRMPD spectra with harmonic
frequencies obtained at the B3LYP-GD3BJ/6-311++G** level of theory.
Discrepancies between the experimental and theoretical data in the
region of 1500–1700 cm–1 are attributed to
the anharmonicity of the amino bending modes. We confirm the result
of a previous IRMPD study that the structure of gas-phase Trp2H+ is charge-solvated but find that there are more
stable structures than originally reported (Feng, R.; Yin, H.; Kong,
X. Rapid Commun. Mass Spectrom.2016, 30, 24–28). In addition, gas-phase Met2H+ and MetTrpH+ have been revealed to
have charge-solvated structures. For all three dimers, the most stable
conformer is found to be of type A. The spectrum of Met2H+, however, cannot be explained without some abundance
of type B charge-solvated conformers as well as salt-bridged structures.
Collapse
Affiliation(s)
- Åke Andersson
- Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Mathias Poline
- Department of Physics, Stockholm University, 114 19 Stockholm, Sweden
| | - Meena Kodambattil
- Department of Physics, University of Gothenburg, 405 30 Gothenburg, Sweden.,International School of Photonics, Cochin University of Science and Technology, Kochi, Kerala 682022, India
| | - Oleksii Rebrov
- Department of Physics, Stockholm University, 114 19 Stockholm, Sweden
| | - Estelle Loire
- Laboratoire de Chimie Physique (UMR8000), Université Paris-Sud, CNRS, Université Paris Saclay, Orsay 91405, France
| | - Philippe Maître
- Laboratoire de Chimie Physique (UMR8000), Université Paris-Sud, CNRS, Université Paris Saclay, Orsay 91405, France
| | - Vitali Zhaunerchyk
- Department of Physics, University of Gothenburg, 405 30 Gothenburg, Sweden
| |
Collapse
|
6
|
Computational study of red- and blue-shifted C H⋯Se hydrogen bond in Q 3 C H⋯SeH 2 (Q = Cl, F, H) complexes. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2017.11.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
7
|
Das B, Chakraborty A, Chakraborty S. Effect of ionic charge on O H⋯Se hydrogen bond: A computational study. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2016.12.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
8
|
Kato S, Niyomura O, Ebihara M, Guo JD, Nagase S. Crystal Structure of 4-Methylbenzenecarbothioic Acid and Computational Investigations of Benzenecarbochalcogenoic Acids (C6H5COEH and C6H5CEOH, E = S, Se, Te). BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20150348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shinzi Kato
- Department of Applied Chemistry, School of Engineering, Chubu University
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University
| | - Osamu Niyomura
- Department of Applied Chemistry, School of Engineering, Chubu University
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University
| | - Masahiro Ebihara
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University
| | - Jing-Dong Guo
- Fukui Institute for Fundamental Chemistry, Kyoto University
| | - Shigeru Nagase
- Fukui Institute for Fundamental Chemistry, Kyoto University
| |
Collapse
|
9
|
Angeloski A, Hook JM, Bhadbhade M, Baker AT, McDonagh AM. Intramolecular H⋯S interactions in metal di-(isopropyl)dithiocarbamate complexes. CrystEngComm 2016. [DOI: 10.1039/c6ce01475e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Intramolecular C–H⋯S interactions create restricted rotation of groups within di(isopropyl)dithiocarbate complexes.
Collapse
Affiliation(s)
- Alexander Angeloski
- School of Mathematical and Physical Sciences
- University of Technology Sydney
- Ultimo, Australia
| | - James M. Hook
- NMR Facility
- Mark Wainwright Analytical Centre
- The University of New South Wales
- Sydney, Australia
| | - Mohan Bhadbhade
- School of Chemistry
- The University of New South Wales
- Sydney, Australia
| | - Anthony T. Baker
- College of Science, Health and Engineering
- La Trobe University
- Melbourne, Australia
| | - Andrew M. McDonagh
- School of Mathematical and Physical Sciences
- University of Technology Sydney
- Ultimo, Australia
| |
Collapse
|
10
|
Francuski BM, Novaković SB, Ostojić BD, Francuski DD, Bogdanović GA. Electronic features and hydrogen bonding capacity of the sulfur acceptor in thioureido-based compounds. Part 2. Further insight by theoretical charge density study. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.05.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
11
|
Durrant MC. A quantitative definition of hypervalency. Chem Sci 2015; 6:6614-6623. [PMID: 30090275 PMCID: PMC6054109 DOI: 10.1039/c5sc02076j] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 08/14/2015] [Indexed: 02/05/2023] Open
Abstract
The concept of hypervalency has had a long but troubled history. Although several attempts have been made to dispense with the concept altogether, it remains in widespread use. By developing a simple but quantitative measure of hypervalency, the concept can be rehabilitated to provide valuable chemical insights in the context of Lewis models.
From the inception of Lewis' theory of chemical bonding, hypervalency has remained a point of difficulty that has not been fully resolved by the currently accepted qualitative definition of this term. Therefore, in this work, a quantitative measure of hypervalency has been developed. The only required input is the atomic charge map, which can be obtained from either quantum calculations or from experiment. Using this definition, it is found that well-known species such as O3, CH2N2 and ClO4–, are indeed hypervalent, whilst others such as XeF4, PCl5 and SO42–, are not. Quantitative analysis of known species of general formulae XFnm–, XClnm–, and XOnm– shows that there are no fundamental differences in chemical bonding for hypervalent and non-hypervalent species. Nevertheless, hypervalency is associated with chemical instability, as well as a high degree of covalent rather than ionic bonding. The implications for accepted Lewis structure conventions are discussed.
Collapse
Affiliation(s)
- Marcus C Durrant
- Department of Applied Sciences , Northumbria University , Newcastle-upon-Tyne , NE1 8ST , UK .
| |
Collapse
|
12
|
Hameed A, Shafiq Z, Yaqub M, Hussain M, Ahmad HB, Tahir MN, Naseer MM. Robustness of a thioamide {⋯H–N–CS}2 synthon: synthesis and the effect of substituents on the formation of layered to cage-like supramolecular networks in coumarin–thiosemicarbazone hybrids. NEW J CHEM 2015. [DOI: 10.1039/c5nj00734h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The study has been carried out to highlight the potential of thiosemicarbazones in crystal engineering.
Collapse
Affiliation(s)
- Aminah Hameed
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800
- Pakistan
| | - Zahid Shafiq
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800
- Pakistan
| | - Muhammad Yaqub
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800
- Pakistan
| | - Mazhar Hussain
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800
- Pakistan
| | - Hafiz Badaruddin Ahmad
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800
- Pakistan
| | | | | |
Collapse
|
13
|
Jawaria R, Hussain M, Shafiq Z, Ahmad HB, Tahir MN, Shad HA, Naseer MM. Robustness of thioamide dimer synthon, carbon bonding and thioamide–thioamide stacking in ferrocene-based thiosemicarbazones. CrystEngComm 2015. [DOI: 10.1039/c4ce02566k] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of thioureas in crystal engineering as robust supramolecular synthons is now recognized, but their analogs, namely thiosemicarbazones/N-iminothioureas, have not received the attention they deserve.
Collapse
Affiliation(s)
- Rifat Jawaria
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800, Pakistan
| | - Mazhar Hussain
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800, Pakistan
| | - Zahid Shafiq
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800, Pakistan
| | - Hafiz Badaruddin Ahmad
- Institute of Chemical Sciences
- Organic Chemistry Division
- Bahauddin Zakariya University
- Multan 60800, Pakistan
| | | | | | | |
Collapse
|
14
|
PANINI PIYUSH, SHUKLA RAHUL, MOHAN TP, VISHALAKSHI B, CHOPRA DEEPAK. Analysis of intermolecular interactions in 3-(4-fluoro-3-phenoxyphenyl)-1-((4-methylpiperazin-1-yl)methyl)-1H-1,2,4-triazole-5-thiol. J CHEM SCI 2014. [DOI: 10.1007/s12039-014-0700-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
15
|
Sheng J, Larsen A, Heuberger BD, Blain JC, Szostak JW. Crystal structure studies of RNA duplexes containing s(2)U:A and s(2)U:U base pairs. J Am Chem Soc 2014; 136:13916-24. [PMID: 25188906 PMCID: PMC4183603 DOI: 10.1021/ja508015a] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
![]()
Structural studies of modified nucleobases
in RNA duplexes are
critical for developing a full understanding of the stability and
specificity of RNA base pairing. 2-Thio-uridine (s2U) is
a modified nucleobase found in certain tRNAs. Thermodynamic studies
have evaluated the effects of s2U on base pairing in RNA,
where it has been shown to stabilize U:A pairs and destabilize U:G
wobble pairs. Surprisingly, no high-resolution crystal structures
of s2U-containing RNA duplexes have yet been reported.
We present here two high-resolution crystal structures of heptamer
RNA duplexes (5′-uagcs2Ucc-3′ paired with 3′-aucgAgg-5′ and with 3′-aucgUgg-5′) containing s2U:A and s2U:U pairs, respectively. For comparison, we also present the structures
of their native counterparts solved under identical conditions. We
found that replacing O2 with S2 stabilizes the U:A base pair without
any detectable structural perturbation. In contrast, an s2U:U base pair is strongly stabilized in one specific U:U pairing
conformation out of four observed for the native U:U base pair. This
s2U:U stabilization appears to be due at least in part
to an unexpected sulfur-mediated hydrogen bond. This work provides
additional insights into the effects of 2-thio-uridine on RNA base
pairing.
Collapse
Affiliation(s)
- Jia Sheng
- Howard Hughes Medical Institute, Center for Computational and Integrative Biology, and Department of Molecular Biology, Simches Research Center, Massachusetts General Hospital , Boston, Massachusetts 02114, United States
| | | | | | | | | |
Collapse
|
16
|
Palmer JH, Parkin G. Synthesis and Structural Characterization of 1-Arylimidazole-2-thiones and N, N'-Aryldiethoxyethylthioureas with Electronically Diverse Substituents: A Manifold of Hydrogen Bonding Networks. NEW J CHEM 2014; 38:4071-4082. [PMID: 25214759 PMCID: PMC4157683 DOI: 10.1039/c4nj00521j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The 1-arylimidazole-2-thiones, (HmimAr) [Ar = 3,4,5-C6H2(OMe)3, 2,4-C6H3(NO2)(OMe), 2,4,6-C6H2Cl3 and 3,5-C6H3(CF3)2], which feature electronically diverse substituents, may be obtained via acid-catalyzed ring closure of the corresponding N,N'-aryldiethoxyethylthiourea derivatives, ArN(H)C(S)N(H)CH2CH(OEt)2, (H2detuAr), which in turn are obtained via treatment of aminoacetaldehyde diethyl acetal, H2NCH2CH(OEt)2, with the respective arylisothiocyanates (ArNCS). The molecular structures of all of the above N,N'-aryldiethoxyethylthioureas and 1-arylimidazole-2-thiones have been determined by X-ray diffraction, thereby demonstrating that the substituents have a profound effect on the crystal structures. For example, each of the N,N'-aryldiethoxyethylthiourea derivatives adopts a different hydrogen bonding pattern. Specifically, the hydrogen-bonding network in (i) H2detuArCl3 consists of chains of 9-membered rings, with an [ [Formula: see text](9)] motif, that feature one N-H ⋯ O and one N-H ⋯ S interaction, (ii) H2detuArOMe,NO2 consists of chains of 6-membered rings, with an [ [Formula: see text](6)] motif, that feature two head-to-tail N-H ⋯ S interactions, (iii) H2detuAr(CF3)2 consists of a dimer that features two pairs of N-H ⋯ O interactions, of which each pair is a component of an 8-membered ring with an [ [Formula: see text](8)] motif, and (iv) H2detuAr(OMe)3 consists of a chain of head-to-head dimeric rings with a basic [ [Formula: see text](16)] motif, a notable feature of which is that sulfur does not play a role as a hydrogen bond acceptor. Each of the 1-arylimidazole-2-thiones exists as a "head-to-head" hydrogen-bonded dimer in the solid state, with an [ [Formula: see text](8)] motif. However, while the hydrogen-bonded motifs for HmimArCl3 and HmimAr(OMe)3 are planar, those for HmimAr(CF3)2 and HmimArOMe,NO2 are extremely puckered, with fold angles of 24.2° (mean value) and 45.7°, respectively.
Collapse
Affiliation(s)
- Joshua H. Palmer
- Department of Chemistry, Columbia University, New York, New York 10027,
USA
| | - Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027,
USA
| |
Collapse
|
17
|
New ferrocene containing 3-(arylthio)propan-1-ones: Synthesis, spectral characterization and crystal structure of 3-[(4-chlorophenyl)thio]-1-ferrocenylpropan-1-one, 3-[(4-chlorophenyl)thio]-1-ferrocenyl-3-phenylpropan-1-one and 3-[(4-chlorophenyl)thio]-3-ferrocenyl-1-phenylpropan-1-one. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
18
|
Transition metal complexes with thiosemicarbazide-based ligands. Part 61. Comparative analysis of structural properties of the pyridoxal thiosemicarbazone ligands. Crystal structure of PLTSC·HCl·2H2O and its complex [Fe(PLTSC)Cl2(H2O)]Cl. Struct Chem 2014. [DOI: 10.1007/s11224-014-0491-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
19
|
Pachuta-Stec A, Kosikowska U, Mazur L, Swatko-Ossor M, Pitucha M, Malm A, Ginalskad G. Synthesis, Characterization and Evaluation of Antimicrobial and Antituberculosis Activities of NewN-(Substituted-thioureido)aminobicyclo Dicarboximide and 3,4-Disubstituted 1,2,4-Triazolino-5-thione. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300362] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
20
|
Does the environment around the H-cluster allow coordination of the pendant amine to the catalytic iron center in [FeFe] hydrogenases? Answers from theory. J Biol Inorg Chem 2013; 18:693-700. [DOI: 10.1007/s00775-013-1014-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Accepted: 05/29/2013] [Indexed: 01/08/2023]
|
21
|
Tooyserkani Z, Kumar L, Sokhansanj S, Saddler J, Bi XT, Lim CJ, Lau A, Melin S. SO2-catalyzed steam pretreatment enhances the strength and stability of softwood pellets. BIORESOURCE TECHNOLOGY 2013; 130:59-68. [PMID: 23347905 DOI: 10.1016/j.biortech.2012.12.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Revised: 11/28/2012] [Accepted: 12/01/2012] [Indexed: 06/01/2023]
Abstract
Densification can partially resolve the logistical challenges encountered when large volumes of biomass are required for bioconversion processes to benefit from economies-of-scale. Despite the higher bulk density of pellets, their lower mechanical strength and sensitivity to moisture are still recurring issues hindering long term transportation and storage. In this study, we have evaluated the potential benefits of SO(2)-catalyzed steam treatment to achieve both the needed size reduction prior to pelletization while improving the stability of the produced pellets. This pretreatment substantially reduced the particle size of the woodchips eliminating any further grinding. The treated pellets had a higher density and exhibited a two-time higher mechanical strength compared to untreated pellets. Despite a higher moisture adsorption capacity, treated pellets remained intact even under highly humid conditions. The high heating values, low ash content and good overall carbohydrate recovery of treated pellets indicated their potential suitability for both biochemical and thermochemical applications.
Collapse
Affiliation(s)
- Zahra Tooyserkani
- Biomass and Bioenergy Research Group, Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC, Canada V6T 1Z3.
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Chopra D. Advances in understanding of chemical bonding: inputs from experimental and theoretical charge density analysis. J Phys Chem A 2012; 116:9791-801. [PMID: 22928665 DOI: 10.1021/jp306169f] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The development of charge density analysis has undergone a major renaissance in the last two decades. In recent years, the characterization of bonding features associated with atoms in molecules and in crystals has been explored using high-resolution X-ray diffraction data (laboratory or synchrotron) complemented by high level ab initio theoretical calculations. The extraction of one electron topological properties, namely, electrostatic charges, dipole moment and higher moments, electrostatic potential, electric field gradients, in addition to evaluation of the local kinetic and potential energy densities, have contributed toward an understanding of the electron density distributions in molecular solids. New topological descriptors, namely, the source function (SF) and electron localization function (ELF) provide additional information as regards characterization of the topology of the electron density. In addition, delocalization indices have also been developed to account for bonding features pertinent to M-M bonds. The evaluation of these properties have contributed significantly toward the understanding of intra- and intermolecular bonding features in organic, inorganic, and biomolecules in the crystalline phase, with concomitant applications in the understanding of chemical reactivity and material/biological properties. In recent years, the focus has strongly shifted toward the understanding of structure-property relationships in organometallic complexes containing labile M-C bonds in the crystal structure with subsequent implications in catalysis. This perspective aims to highlight the major developments in electron density measurements in the past few years and provides pointers directed toward the potential use of this technique in future applications for an improved understanding of chemical bonding in systems that have been unexplored.
Collapse
Affiliation(s)
- Deepak Chopra
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal 462023, India.
| |
Collapse
|
23
|
Nakanishi W, Hayashi S, Pitak MB, Hursthouse MB, Coles SJ. Dynamic and Static Behaviors of N–Z–N σ(3c–4e) (Z = S, Se, and Te) Interactions: Atoms-in-Molecules Dual Functional Analysis with High-Resolution X-ray Diffraction Determination of Electron Densities for 2-(2-Pyridylimino)-2H-1,2,4-thiadiazolo[2,3-a]pyridine. J Phys Chem A 2011; 115:11775-87. [DOI: 10.1021/jp2044898] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Waro Nakanishi
- Department of Material Science and Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama, 640-8510 Japan
| | - Satoko Hayashi
- Department of Material Science and Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakaedani, Wakayama, 640-8510 Japan
| | - Mateusz B. Pitak
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, United Kingdom
| | - Michael B. Hursthouse
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, United Kingdom
| | - Simon J. Coles
- School of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, United Kingdom
| |
Collapse
|