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Martı Nez-Alonso M, Sanz P, Ortega P, Espino G, Jalón FA, Martín M, Rodrı Guez AM, López JA, Tejel C, Manzano BR. Analysis of Ion Pairing in Solid State and Solution in p-Cymene Ruthenium Complexes. Inorg Chem 2020; 59:14171-14183. [PMID: 32930592 DOI: 10.1021/acs.inorgchem.0c01951] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The importance of ion pairing in different fields of chemistry is widely recognized. In this work, we have synthesized a set of cationic p-cymene ruthenium complexes of general formula [(p-cym)Ru(L')(κ2-O^N-L)]X (p-cym = p-cymene; L' = N-methylimidazole (MeIm), N-ethylpiperidylimidazole (EpipIm), 1,3,5-triaza-7-phosphaadamantane (PTA); L = 2-(1H-benzimidazol-2-yl)phenolato (L1), 2-(1,3-benzothiazol-2-yl)phenolato (L2); X = Cl-, BF4-, OTf-, BPh4-). X-ray diffraction studies on selected complexes revealed relatively strong anion-cation interactions in the solid state mainly based on N-H···X (X = Cl, F, O) and C-H···π interactions, also observed in the DFT-modeled complexes in the gas phase. Moreover, NMR studies showed that they exist as intimate ion pairs in solution and, remarkably, as head-to-tail quadruples in the particular case of the cation [(p-cym)Ru(MeIm)(κ2- O^N-L1)]+ ([1]+) with Cl- and BPh4- as counteranions. Furthermore, a value of ΔG = -2.9 kcal mol-1 at 299 K has been estimated for the equilibrium {[1]BPh4···[1]BPh4} ⇆ 2{[1]+···BPh4-} in concentrated CDCl3 solutions. In addition, preliminary studies concerning the cytotoxic properties against HeLa cell lines of the derivatives suggested a positive effect derived from the presence of the lipophilic BPh4- anion and also from the NH group of the benzimidazolyl fragment.
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Affiliation(s)
- Marta Martı Nez-Alonso
- University de Burgos. Departamento de Química, Facultad de Ciencias, Plaza Misael Bañuelos s. n., 09001-Burgos, Spain
| | - Pedro Sanz
- University de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica, CRIB, Fac. de Ciencias y Tecnologías Químicas, Avda. C. J. Cela, 10, 13071-Ciudad Real, Spain
| | - Paula Ortega
- University de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica, CRIB, Fac. de Ciencias y Tecnologías Químicas, Avda. C. J. Cela, 10, 13071-Ciudad Real, Spain
| | - Gustavo Espino
- University de Burgos. Departamento de Química, Facultad de Ciencias, Plaza Misael Bañuelos s. n., 09001-Burgos, Spain
| | - Félix A Jalón
- University de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica, CRIB, Fac. de Ciencias y Tecnologías Químicas, Avda. C. J. Cela, 10, 13071-Ciudad Real, Spain
| | - Mairena Martín
- University de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica, CRIB, Fac. de Ciencias y Tecnologías Químicas, Avda. C. J. Cela, 10, 13071-Ciudad Real, Spain
| | - Ana M Rodrı Guez
- University de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica, IRICA, Escuela Técnica Superior de Ingenieros Industriales, Avda. C. J. Cela, 3, 13071-Ciudad Real, Spain
| | - José A López
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Cristina Tejel
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Blanca R Manzano
- University de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica, CRIB, Fac. de Ciencias y Tecnologías Químicas, Avda. C. J. Cela, 10, 13071-Ciudad Real, Spain
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A computational study of hydrogen bonding motifs in halide, tetrafluoroborate, hexafluorophosphate, and tetraarylborate salts of chiral cationic ruthenium and cobalt guanidinobenzimidazole hydrogen bond donor catalysts; acceptor properties of the “BArf” anion. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114618] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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3
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Maity T, Mandal H, Bauzá A, Samanta BC, Frontera A, Seth SK. Quantifying conventional C–H⋯π(aryl) and unconventional C–H⋯π(chelate) interactions in dinuclear Cu(ii) complexes: experimental observations, Hirshfeld surface and theoretical DFT study. NEW J CHEM 2018. [DOI: 10.1039/c8nj00747k] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Conventional C–H⋯π(aryl) and unconventional C–H⋯π(chelate) interactions are explored in detail.
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Affiliation(s)
- Tithi Maity
- Department of Chemistry
- P. K. College
- Purba Medinipur
- India
| | - Haridas Mandal
- Chemical División
- Geological Survey of India
- Hyderabad-500068
- India
| | - Antonio Bauzá
- Department of Chemistry
- Universitat de les Illes Balears
- 07122 Palma de Mallorca (Baleares)
- Spain
| | | | - Antonio Frontera
- Department of Chemistry
- Universitat de les Illes Balears
- 07122 Palma de Mallorca (Baleares)
- Spain
| | - Saikat Kumar Seth
- Department of Chemistry
- Universitat de les Illes Balears
- 07122 Palma de Mallorca (Baleares)
- Spain
- Department of Physics
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4
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Baradel N, Mobian P, Khalil G, Henry M. Titanium(iv)-based helicates incorporating the ortho-phenylenediamine ligand: a structural and a computational investigation. Dalton Trans 2017; 46:7594-7602. [DOI: 10.1039/c7dt00912g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report neutral Ti(iv)-based helical architectures formed with the ortho-phenylenediamine ligand and strands bearing 2,2-biphenolato units. Experimental observations are explained through a computational study.
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Affiliation(s)
- Nathalie Baradel
- Laboratoire de Chimie Moléculaire de l'Etat solide
- UMR 7140
- University of Strasbourg
- Strasbourg
- France
| | - Pierre Mobian
- Laboratoire de Chimie Moléculaire de l'Etat solide
- UMR 7140
- University of Strasbourg
- Strasbourg
- France
| | - Georges Khalil
- Laboratoire de Chimie Moléculaire de l'Etat solide
- UMR 7140
- University of Strasbourg
- Strasbourg
- France
| | - Marc Henry
- Laboratoire de Chimie Moléculaire de l'Etat solide
- UMR 7140
- University of Strasbourg
- Strasbourg
- France
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5
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Choi YW, Lee JJ, Nam E, Lim MH, Kim C. A fluorescent chemosensor for Al3+ based on julolidine and tryptophan moieties. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.02.066] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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6
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Sudhakar P, Mukherjee S, Thilagar P. Revisiting Borylanilines: Unique Solid-State Structures and Insight into Photophysical Properties. Organometallics 2013. [DOI: 10.1021/om301197f] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Pagidi Sudhakar
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Sanjoy Mukherjee
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Pakkirisamy Thilagar
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore-560012, India
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7
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Faggi E, Luis SV, Alfonso I. Minimalistic amino amides as models to study N–H⋯π interactions and their implication in the side chain folding of pseudopeptidic molecules. RSC Adv 2013. [DOI: 10.1039/c3ra41843j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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8
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Medaković VB, Bogdanović GA, Milčić MK, Janjić GV, Zarić SD. CH/π interactions in metal–porphyrin complexes with pyrrole and chelate rings as hydrogen acceptors. J Inorg Biochem 2012; 117:157-63. [DOI: 10.1016/j.jinorgbio.2012.09.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 09/01/2012] [Accepted: 09/01/2012] [Indexed: 10/27/2022]
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Weekes DM, Baradel N, Kyritsakas N, Mobian P, Henry M. Rational Synthesis of a Family of Neutral Monomeric Heteroleptic Titanium Complexes Based on an Octahedral TiO4N2Motif. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200560] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Dörr AA, Lubell WD. Synthesis of Protected 2-Pyrrolylalanine for Peptide Chemistry and Examination of Its Influence on Prolyl Amide Isomer Equilibrium. J Org Chem 2012; 77:6414-22. [DOI: 10.1021/jo3005809] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Aurélie A. Dörr
- Département de Chimie, Université de Montréal, C.P.6128. Succursale Centre-Ville,
Montréal, Québec, Canada H3C 3J7
| | - William D. Lubell
- Département de Chimie, Université de Montréal, C.P.6128. Succursale Centre-Ville,
Montréal, Québec, Canada H3C 3J7
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11
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Jami AK, Baskar V. Tetranuclear stiboxanes (RSb)4O6, exhibiting an adamantane-type structure. Dalton Trans 2012; 41:12524-9. [DOI: 10.1039/c2dt30587a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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12
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Xiao J, Deng L. Synthesis, Structure, and Reactivity Study of Iron(II) Complexes with Bulky Bis(anilido)thioether Ligation. Organometallics 2011. [DOI: 10.1021/om201010a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jie Xiao
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai, People’s Republic
of China 200032
| | - Liang Deng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy
of Sciences, 345 Lingling Road, Shanghai, People’s Republic
of China 200032
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Yang CM, Zhang J. Insights into intramolecular Trp and His side-chain orientation and stereospecific π interactions surrounding metal centers: an investigation using protein metal-site mimicry in solution. Chemistry 2011; 16:10854-65. [PMID: 20669189 DOI: 10.1002/chem.200903149] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Metal-binding scaffolds incorporating a Trp/His-paired epitope are instrumental in giving novel insights into the physicochemical basis of functional and mechanistic versatility conferred by the Trp-His interplay at a metal site. Herein, by coupling biometal site mimicry and (1)H and (13)C NMR spectroscopy experiments, modular constructs EDTA-(L-Trp, L-His) (EWH; EDTA=ethylenediamino tetraacetic acid) and DTPA-(L-Trp, L-His) (DWH; DTPA=diethylenetriamino pentaacetic acid) were employed to dissect the static and transient physicochemical properties of hydrophobic/hydrophilic aromatic interactive modes surrounding biometal centers. The binding feature and identities of the stoichiometric metal-bound complexes in solution were investigated by using (1)H and (13)C NMR spectroscopy, which facilitated a cross-validation of the carboxylate, amide oxygen, and tertiary amino groups as the primary ligands and indole as the secondary ligand, with the imidazole (Im) N3 nitrogen being weakly bound to metals such as Ca(2+) owing to a multivalency effect. Surrounding the metal centers, the stereospecific orientation of aromatic rings in the diastereoisomerism is interpreted with the Ca(2+)-EWH complex. With respect to perturbed Trp side-chain rotamer heterogeneity, drastically restricted Trp side-chain flexibility and thus a dynamically constrained rotamer interconversion due to π interactions is evident from the site-selective (13)C NMR spectroscopic signal broadening of the Trp indolyl C3 atom. Furthermore, effects of Trp side-chain fluctuation on indole/Im orientation were the subject of a 2D NMR spectroscopy study by using the Ca(2+)-bound state; a C-H2(indolyl)/C-H5(Im(+)) connectivity observed in the NOESY spectra captured direct evidence that the N-H1 of the Ca(2+)-Im(+) unit interacted with the pyrrole ring of the indole unit in Ca(2+)-bound EWH but not in DWH, which is assignable to a moderately static, anomalous, T-shaped, interplanar π(+)-π stacking alignment. Nevertheless, a comparative (13)C NMR spectroscopy study of the two homologous scaffolds revealed that the overall response of the indole unit arises predominantly from global attractions between the indole ring and the entire positively charged first coordination sphere. The study thus demonstrates the coordination-sphere/geometry dependence of the Trp/His side-chain interplay, and established that π interactions allow (13)C NMR spectroscopy to offer a new window for investigating Trp rotamer heterogeneity near metal-binding centers.
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Affiliation(s)
- Chi Ming Yang
- Neurochemistry & Biophysical Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
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14
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Ming Yang C. Biometal binding-site mimicry with modular, hetero-bifunctionally modified architecture encompassing a Trp/His motif: Insights into spatiotemporal noncovalent interactions from a comparative spectroscopic study. Dalton Trans 2011; 40:3008-27. [DOI: 10.1039/c0dt00237b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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New Cu (II) and Co(II) octaazamacrocyclic complexes with 2-amino-3-phenyl-propanoic acid. JOURNAL OF THE SERBIAN CHEMICAL SOCIETY 2011. [DOI: 10.2298/jsc101201062v] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
New cationic Cu(II) and Co(II) complexes with
N,N',N'',N'''-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane
(tpmc) and the anion of 2-amino-3-phenyl-propanoic acid (S-phenylalanine)
were prepared. The complexes were analyzed and characterized by elemental
analysis, conductometric, polarimetric, magnetic and cyclic voltammetric
measurements, as well as by spectroscopic data (UV/Vis, IR). Both complexes
are binuclear with the general formula [M2(S-Phe)tpmc](ClO4)3?nH2O; S-PheH =
S-phenylalanine, M(II) = Cu, n = 7; Co, n = 0. Based on previously reported
data for some familiar complexes and the present results, pentacoordinated
geometry was proposed. Both of the central metal ions are coordinated with
two pyridyl and two cyclam nitrogens and bridged with -N-(CH2)3-N- portions
of the cyclam ring and oxygen atoms of the S-phenylalaninate ion.
Antimicrobial screening of the complexes, solvent, starting salts and
ligands alone was performed against fungi, mould and some bacteria. In
certain cases, enhanced activity of Co(II) complex towards bacteria compared
with the relevant free ligands and starting salts was detected.
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Takahashi I, Inomata T, Funahashi Y, Ozawa T, Masuda H. Electron-Transfer Reactions through the Associated Interaction between Cytochromec and Self-Assembled Monolayers of Optically Active Cobalt(III) Complexes: Molecular Recognition Ability Induced by the Chirality of the Cobalt(III) Units. Chemistry 2007; 13:8007-17. [PMID: 17616958 DOI: 10.1002/chem.200700155] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Self-assembled monolayers (SAMs) of optically active Co(III) complexes ((S)-2/(R)-2) that contain (S)- or (R)-phenylalanine derivatives as a molecular recognition site were constructed on Au electrodes ((S)-2-Au/(R)-2-Au). Molecular recognition characteristics induced by the S and R configurations were investigated by measurements of electron-transfer reactions with horse heart cytochrome c (cyt c). The electrochemical studies indicate that the maximum current of cyt c reduction is obtained when the Au electrode is modified by 2 with a moderate coverage of approximately 4.0 x 10(-11) mol cm(-2). Since the Au electrode is not densely packed with the Co(III) units at this concentration, we conclude that the penetrative association process between cyt c and the Co(III) unit plays an important role in this electron-transfer system. The differences in the electron-transfer rates of (S)-2-Au and (R)-2-Au increase with increasing scan rates, a result indicating that the chiral ligand has an influence on the rate of association of the complexes with cyt c. 3-Au has a mixed monolayer composed of 2 and hexanethiol and exhibits electron-transfer behavior comparable to 2-Au. The difference in the association rates of (S)-3-Au and (R)-3-Au is larger than that between (S)-2-Au and (R)-2-Au, which indicates that the molecular recognition ability of 3-Au has been enhanced by filling the gap between molecules of 2 with hexanethiols. The differences in the oxidation rates of cyt c(II) between (S)-2-Au and (R)-2-Au and between (S)-3-Au and (R)-3-Au were larger than the differences in the rates of the reduction of cyt c(III); this suggests that the size of the heme crevice varies according to the oxidation state of cyt c.
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Affiliation(s)
- Isao Takahashi
- Department of Applied Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya 466-8555, Japan
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Milcic MK, Medaković VB, Sredojević DN, Juranić NO, Zarić SD. Electron delocalization mediates the metal-dependent capacity for CH/pi interactions of acetylacetonato chelates. Inorg Chem 2007; 45:4755-63. [PMID: 16749840 DOI: 10.1021/ic051926g] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
CH/pi interactions between the coordinated acetylacetonato ligand and phenyl rings were analyzed in the crystal structures from the Cambridge Structural Database and by quantum chemical calculations. The acetylacetonato ligand may engage in two types of interactions: it can be hydrogen atom donor or acceptor. The analysis of crystal structures and calculations show that interactions with the acetylacetonato ligand acting as hydrogen atom donor depend on the metal in an acetylacetonato chelate ring; the chelate rings with soft metals make stronger interactions. The same trend was not observed in the interactions where the acetylacetonato chelate ring acts as the hydrogen atom acceptor.
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Affiliation(s)
- Milos K Milcic
- Department of Chemistry, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia and Montenegro
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Alcohols as Replacements of the Central Amide in β-Turns, Synthesis of Pro-Aib Hydroxyethylene Isostere and Analysis in Model β-Turn Peptides. Int J Pept Res Ther 2007. [DOI: 10.1007/s10989-007-9093-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Yang CM, Li X, Wei W, Li Y, Duan Z, Zheng J, Huang T. Dissecting the General Physicochemical Properties of Noncovalent Interactions Involving Tyrosine Side Chain as a Second-Shell Ligand in Biomolecular Metal-Binding Site Mimetics: An Experimental Study Combining Fluorescence,13C NMR Spectroscopy and ESI Mass Spectrometry. Chemistry 2007; 13:3120-30. [PMID: 17201001 DOI: 10.1002/chem.200600661] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Detailed physicochemical features inherent in the dynamic cation-pi interactions of aromatic amino acid side chains in the secondary coordination spheres around metal ions were extracted and mapped by intrinsic tyrosine fluorescence titration experiments with two homologous, artificially engineered metal-binding scaffolds which mimic metal-binding sites in metalloproteins. A newly formulated method for the treatment of fluorescence titration data allows straightforward assessment of both the magnitudes and properties of metal-chelation-assisted cation-aromatic interactions (K2) underlying a proposed two-step metallosupramolecular association process. The unprecedented linear platform-motif correlations between the two contrasting scaffolds in their changes in tyrosine fluorescence on binding of 3d metal cations help to elucidate the properties of general cation-arene recognition corresponding to the metal-responsive characteristics of the second-shell Tyr residue surrounding the metal-binding sites in the supramolecular context, and thereby define a new noncovalent design principle for metal-ion recognition in aqueous solution. As supported by NMR spectroscopic and ESI-MS analyses and molecular mechanics force field calculations, the systematic study exemplifies the concept of using steady-state tyrosine fluorescence as a powerful tool for comprehensive descriptions of cation-pi interactions in the extended environment of a metal-binding site. We established that the physicochemical properties pertaining to indirect metal-arene interactions are highly dependent on the electronic properties of the metal ions. This work suggests that second-shell cation-pi interactions may play more diverse roles, including modulation of structure, reactivity, and function of metal-binding sites, than the previously well-established direct cation-pi interactions involving hard cations (e.g., alkali metal ions). Moreover, such a study will continue to complement theoretical predications and/or the early experimental investigations in organic solvents.
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Affiliation(s)
- Chi Ming Yang
- Neurochemistry and Physical Organic Chemistry, Nankai University, Tianjin 300071, China.
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Xie Y, Yan Y, Wu HH, Yong GP, Cui Y, Wang ZY, Pan L, Li J, Fan R, Li RP, Tian YC, Pan GQ, Sheng LS, Li X. Homochiral metal–organic coordination networks from l-typtophan. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2006.09.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Probing electron transfer reactions between two azurins from Alcaligenes xylosoxidans GIFU 1051 with optically active Ru complexes as molecular recognition probes: Importance of the 43rd residue. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2006.08.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Influence of metal and ligand types on stacking interactions of phenyl rings with square-planar transition metal complexes. OPEN CHEM 2007. [DOI: 10.2478/s11532-006-0068-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractIn order to find out whether metal type influences the stacking interactions of phenyl rings in square-planar complexes, geometrical parameters for Cu, Ni, Pd and Pt complexes, with and without chelate rings, were analyzed and compared. By searching the Cambridge Structural Database, 220 structures with Cu complexes, 211 with Ni complexes, 285 with Pd complexes, and 220 with Pt complexes were found. The results show that the chelate ring has a tendency to make the stacking interaction with the phenyl ring independent of metal type in the chelate ring. However, there are some differences among metals for complexes without a chelate ring. There are a number of structures containing Pd and Pt complexes, without chelate rings, that have short carbon-metal distances and parallel orientations of the phenyl ring with respect to the coordination plane. It was found that some of these complexes have a common fragment, CN, as a part of the ligands. This indicates that the CN supports stacking interactions of square planar complexes with the phenyl ring.
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Dörr A, Lubell WD. Synthesis of a new π-deficient phenylalanine derivative from a common 1,4-diketone intermediate and study of the influence of aromatic density on prolyl amide isomer population. Biopolymers 2007; 88:290-9. [PMID: 17143857 DOI: 10.1002/bip.20643] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Enantiopure (2S)-N-(Boc)-3-(6-methylpyridazinyl)alanine (14) has been synthesized to serve as a phenylalanine analog lacking significant pi-donor capability. Two approaches were developed to furnish the target compound from L-aspartic acid as chiral educt in respectively six and nine steps and 13% and 12% yields. In both routes, a key homoallylic ketone intermediate was synthesized by a copper-catalyzed cascade addition of vinylmagnesium bromide to a carboxylic ester. Dipeptide models Ac-Xaa-Pro-NHMe (21a-c) were prepared and the relative populations of prolyl cis- and trans-amide isomers were measured in chloroform, dimethylsulfoxide, and water by proton NMR spectroscopy in order to assess the significance of the electron density of the neighboring aromatic residue on the prolyl amide geometry.
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Affiliation(s)
- Aurélie Dörr
- Département de Chimie, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, QC, Canada
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Sredojević D, Bogdanović GA, Tomić ZD, Zarić SD. Stacking vs. CH–π interactions between chelate and aryl rings in crystal structures of square-planar transition metal complexes. CrystEngComm 2007. [DOI: 10.1039/b704302c] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Jitsukawa K, Mabuchi T, Einaga H, Masuda H. Site-Specific Recognition of Dipeptides Through Non-Covalent Inter-Ligand Interactions for the Hydrolysis of Dipeptide to Amino Acid Ligands Mediated by Ternary Cobalt(III) Complexes. Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200600400] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Miodragović DU, Bogdanović GA, Miodragović ZM, Radulović MD, Novaković SB, Kaluderović GN, Kozłowski H. Interesting coordination abilities of antiulcer drug famotidine and antimicrobial activity of drug and its cobalt(III) complex. J Inorg Biochem 2006; 100:1568-74. [PMID: 16831463 DOI: 10.1016/j.jinorgbio.2006.05.009] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2006] [Revised: 05/15/2006] [Accepted: 05/23/2006] [Indexed: 11/21/2022]
Abstract
Crystal structure of a novel cobalt(III) complex with antiulcer drug famotidine and ethylenediamine was determined. This is the second structure of a transition metal complex with famotidine resolved by a single crystal X-ray analysis, in which famotidine shows different mode of coordination than that observed in the other cases. Drug molecule is coordinated to metal ion as a tetradentate ligand through guanidine N6, thiazole N4, thioether S2 and terminal N3 atom. Two NH(2) groups (N3H(2) and N6H(2)) are deprotonated and drug coordinates as dianion. In the asymmetric unit, one chloride anion and one water molecule were found to complete the complex stoichiometry. The structure of the complex is abundant in atoms, which can be involved in hydrogen bond formation either as hydrogen acceptors or hydrogen donors. Because of that, a great number of hydrogen bonds dominates the crystal packing. Beside the hydrogen bonds, there are two interesting noncovalent interactions: CH(...)pi and NH(...)pi within the famotidine anion, which stabilize the complex structure. The pi(...)pi stacking interactions between neighboring complex cations are also observed. Antibacterial and antifungal activity of famotidine and its newly synthesized complex against representative bacteria: Escherichia coli, Staphilococcus aureus and Micrococcus lysodeikticus and fungi: Aspergillus niger and Candida albicans were examined. The results indicate a higher selectivity of the famotidine-Co(III) complex, as well as better growth inhibitory activity (lower MIC values (MIC, minimal inhibitory concentration)) in comparison with the drug alone.
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Affiliation(s)
- Djenana U Miodragović
- Faculty of Chemistry, University of Belgrade, Studentski trg 16, P.O. Box 158, 11 000 Belgrade, Serbia and Montenegro.
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Affiliation(s)
- Michael Kruppa
- Institut für Organische Chemie, Universität Regensburg, D-93040 Regensburg, Germany
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Ma LJ, Liu YF, Wu Y. A tryptophan-containing fluoroionophore sensor with high sensitivity to and selectivity for lead ion in water. Chem Commun (Camb) 2006:2702-4. [PMID: 16786093 DOI: 10.1039/b604623a] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report herein a fluoroionophore sensor derivated from tryptophan that shows high sensitivity (detection limit up to 0.15 microM) and specific selectivity for lead ion (Pb2+) over Ca2+, Cd2+, Co2+, Cr3+, Cu2+, K+, Mg2+, Na+, Fe2+, Mn2+, Ni2+ and Zn2+ in aqueous solution.
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Affiliation(s)
- Li-Jun Ma
- Key Laboratory for Supramolecular Structure and Material of Ministry of Education, Jilin University, 2699 Qianjin Street, Changchun, P. R. China
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Medaković VB, Milcić MK, Bogdanović GA, Zarić SD. C-H. . .pi interactions in the metal-porphyrin complexes with chelate ring as the H acceptor. J Inorg Biochem 2005; 98:1867-73. [PMID: 15522414 DOI: 10.1016/j.jinorgbio.2004.08.012] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2004] [Revised: 07/27/2004] [Accepted: 08/09/2004] [Indexed: 11/22/2022]
Abstract
Specific C-H. . .pi interactions with the pi-system of porphyrinato chelate ring were found in crystal structures of transition metal complexes from the Cambridge Structural Database and statistical analysis of geometrical parameters for intramolecular and intermolecular interactions was done. By density functional theory calculations on a model system it was evaluated that an interaction energy is above 1.5 kcal/mol and that the strongest interaction occurs when the distance between hydrogen atom and the center of the chelate ring is 2.6 A. This prediction is in good agreement with the distances for intermolecular interactions found in the crystal structures. In many cases the intramolecular interaction distances are much shorter than 2.6 A, and these short distances are caused by geometrical constrains. The C-H. . .pi interactions with chelate ring of porphyrinato ligand can influence the structure, contribute to its stability, and play some role in the function of biomolecules with metalo porphyrins.
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Affiliation(s)
- Vesna B Medaković
- Department of Chemistry, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia and Montenegro
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NH···π Interactions Stabilize the Most-Hindered Rotamer of the(S)-Tyrosinato Side Group in Bis[(S)-tyrosinato](diamine)cobalt(III) Complexes: An NMR Spectroscopic and DFT Study. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400873] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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Li Y, Yang CM. A Tryptophan-Containing Open-Chain Framework for Tuning a High Selectivity for Ca2+ and 13C NMR Observation of a Ca2+−Indole Interaction in Aqueous Solution. J Am Chem Soc 2005; 127:3527-30. [PMID: 15755174 DOI: 10.1021/ja046517i] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two molecular architectures featuring the cation-responsive tryptophan indole were designed and investigated for the development of a novel fluorescent chemosensor for Ca2+. We observed that the Trp-based open-framework chemosensor EW2 exhibits remarkable selectivity for Ca2+ over Mg2+, Ba2+, K+, Na+, and Li+ in water between pH 4.6 and 7.0 on the basis of Ca2+-induced high fluorescence enhancement of the Trp residue. A combined 13C NMR and CD spectroscopic study has demonstrated a dynamic reorientation of the indole ring due to the cation-indole interaction accompanying the Ca2+-induced dramatic fluorescence enhancement. The results suggest that the highly sensitive, metal-ion-dependent Trp indolyl C(3) chemical shifts may serve as a promising indicator for monitoring metal ion-indole noncovalent interaction in solution.
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Affiliation(s)
- Yitong Li
- Neurochemistry and Physical Organic Chemistry, Nankai University, Tianjin 300071, China
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32
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Milčić MK, Tomić ZD, Zarić SD. Very strong metal ligand aromatic cation-π interactions in transition metal complexes: intermolecular interaction in tetraphenylborate salts. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.06.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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The structure of Λ-β1-[Co(R,R-picchxn)(S-tyr)]Br2·3.5H2O and solution configuration of Λ-β1-[Co(R,R-picchxn)(aromatic S-aminoacidate)]2+ complexes: model systems for the investigation of non-covalent aromatic interactions. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.01.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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34
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Emseis P, Hibbs DE, Leverett P, Reddy N, Williams PA. Weak intramolecular interactions in perchlorate salts of Λ-β1-[Co(R,R-picchxn)(R-aa)]2+ [picchxn=N,N′-di(2-picolyl)-1,2-diaminocyclohexane; aa=phenylalaninato(1−), tyrosinato(1−)] and their diastereoisomeric equilibration in solution. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2004.01.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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35
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Tomić Z, Novaković S, Zarić S. Intermolecular Interactions between Chelate Rings and Phenyl Rings in Square-Planar Copper(II) Complexes. Eur J Inorg Chem 2004. [DOI: 10.1002/ejic.200400086] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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36
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Intramolecular NH–π and π–π interactions in ternary cobalt(III) complexes of aromatic aminoacids: a structural and NMR study. Polyhedron 2004. [DOI: 10.1016/j.poly.2004.04.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Jitsukawa K, Katoh A, Funato K, Ohata N, Funahashi Y, Ozawa T, Masuda H. Kinetic Resolution of rac-Phenylalanine by Stereoselective Complexation to a Chiral Cobalt Complex through π−π Stacking Interaction. Inorg Chem 2003; 42:6163-5. [PMID: 14514289 DOI: 10.1021/ic030135g] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A cobalt(III) complex with chiral ligand, H2cpel (N-carboxymethyl-N-pyridylethyl-l-leucine), was prepared for chiral recognition of amino acids. Through the competitive coordination of racemic phenylalanine to the chiral cobalt complex, [Co(cpel)(CO(3))](-) (1), enantioselective recognition was achieved on the ternary complex, which was determined on the basis of HPLC analysis with a chiral column. The formation rate for the [Co(cpel)(l-phe)] complex (2) was 6-times superior to that of [Co(cpel)(d-phe)] (3). The preferential formation of 2 might be illustrated by the interligand pi-pi stacking interaction. Crystal structural analysis for 2 and 3 revealed that aromatic rings, pyridine ring of CPEL and phenylalanine sidechain, in 2 were very close each other but those in 3 were far apart. Such interligand aromatic interaction in 2 was also examined by the use of (1)H NMR spectra.
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Affiliation(s)
- Koichiro Jitsukawa
- Department of Applied Chemistry, Nagoya Institute of Technology, Gokiso-cho Showa-ku, Nagoya 466-8555, Japan.
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Esteban J, Font-Bardia M, Gallego C, González G, Martı́nez M, Solans X. Substitution reactions on cyclometallated Pt(IV) complexes; a kinetic survey of the bond strength of PtS, N, and P-based ligands. Inorganica Chim Acta 2003. [DOI: 10.1016/s0020-1693(03)00117-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Tomić Z, Leovac V, Pokorni SV, Zobel D, Zarić S. Crystal Structure of Bis[acetone-1-naphthoylhydrazinato(−1)]copper(II) and Investigations of Intermolecular Interactions. Eur J Inorg Chem 2003. [DOI: 10.1002/ejic.200390158] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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Yamauchi O, Odani A, Takani M. Metal–amino acid chemistry. Weak interactions and related functions of side chain groups. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b202385g] [Citation(s) in RCA: 180] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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