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Baishya A, Kumar L, Barman MK, Biswal HS, Nembenna S. N-Heterocyclic Carbene–Carbodiimide (“NHC–CDI”) Adduct or Zwitterionic-Type Neutral Amidinate-Supported Magnesium(II) and Zinc(II) Complexes. Inorg Chem 2017; 56:9535-9546. [DOI: 10.1021/acs.inorgchem.7b00879] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ashim Baishya
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Lokesh Kumar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Milan Kr. Barman
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Himansu S. Biswal
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
| | - Sharanappa Nembenna
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), Homi Bhabha National Institute (HBNI), Bhubaneswar 752 050, India
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2
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Dankert F, Reuter K, Donsbach C, von Hänisch C. A structural study of alkaline earth metal complexes with hybrid disila-crown ethers. Dalton Trans 2017; 46:8727-8735. [DOI: 10.1039/c6dt04018g] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of disila-crown ether complexes have been characterized by single crystal X-ray diffraction. The complex stability of different systems were studied by DFT calculations and proton NMR experiments.
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Affiliation(s)
- Fabian Dankert
- Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften (WZMW)
- Philipps-Universität Marburg
- D-35032, Marburg
- Germany
| | - Kirsten Reuter
- Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften (WZMW)
- Philipps-Universität Marburg
- D-35032, Marburg
- Germany
| | - Carsten Donsbach
- Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften (WZMW)
- Philipps-Universität Marburg
- D-35032, Marburg
- Germany
| | - Carsten von Hänisch
- Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften (WZMW)
- Philipps-Universität Marburg
- D-35032, Marburg
- Germany
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3
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Torvisco A, Ruhlandt-Senge K. Heavy Alkaline-Earth Metal Organometallic and Metal Organic Chemistry: Synthetic Methods and Properties. TOP ORGANOMETAL CHEM 2013. [DOI: 10.1007/978-3-642-36270-5_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
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4
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Torvisco A, Ruhlandt-Senge K. s-Block Organometallics: Analysis of Ion-Association and Noncovalent Interactions on Structure and Function in Benzyl-Based Compounds. Inorg Chem 2011; 50:12223-40. [DOI: 10.1021/ic201148d] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ana Torvisco
- Department of Chemistry, Syracuse University, 1-014 CST, Syracuse, New York 13244, United States
| | - Karin Ruhlandt-Senge
- Department of Chemistry, Syracuse University, 1-014 CST, Syracuse, New York 13244, United States
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5
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Torvisco A, Ruhlandt-Senge K. Ligand and Coligand Effects on Ion Association in Magnesium Amides. Organometallics 2011. [DOI: 10.1021/om101045b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ana Torvisco
- Department of Chemistry, CST 1-014, Syracuse University, Syracuse, New York 13244, United States
| | - Karin Ruhlandt-Senge
- Department of Chemistry, CST 1-014, Syracuse University, Syracuse, New York 13244, United States
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Fedushkin IL, Nikipelov AS, Skatova AA, Maslova OV, Lukoyanov AN, Fukin GK, Cherkasov AV. Reduction of Disulfides with Magnesium(II) and Gallium(II) Complexes of a Redox-Active Diimine Ligand. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900456] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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7
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Strukturen von polaren Magnesiumorganylen: Synthese und Struktur von Basen-Addukten des Bis(cyclopentadienyl)magnesiums. Z Anorg Allg Chem 2008. [DOI: 10.1002/zaac.200700445] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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8
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Guino-o MA, Baker E, Ruhlandt-Senge K. The metal influence on the structural chemistry of alkynes: synthetic, spectroscopic and structural studies on magnesium acetylides. J COORD CHEM 2007. [DOI: 10.1080/00958970701732790] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Marites A. Guino-o
- a Department of Chemistry , 1-014 Center for Science and Technology, Syracuse University , Syracuse, New York 13244-4100
| | - Eva Baker
- a Department of Chemistry , 1-014 Center for Science and Technology, Syracuse University , Syracuse, New York 13244-4100
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Yang J, Li C, Li D, Wang D. catena-Poly[[nickel(II)-μ(3)-1,1-dicyano-ethene-2,2-dithiol-ato-κS,S':N:N'-bis-[(15-crown-5)magnesium(II)]-μ(3)-1,1-dicyano-ethene-2,2-dithiol-ato-κN:N':S,S'] dichloride]. Acta Crystallogr Sect E Struct Rep Online 2007; 64:m174. [PMID: 21200522 PMCID: PMC2915109 DOI: 10.1107/s1600536807065622] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2007] [Accepted: 12/04/2007] [Indexed: 11/16/2022]
Abstract
The reaction of MgCl2, NiCl2, and Na2(i-mnt) (i-mnt is 1,1-dicyanothene-2,2-dithiolate) with 15-crown-5 (15-C-5) leads to an infinite chain polymer, {[NiMg2(C4N2S2)2(C10H20O5)2]Cl2}n or {[Mg(15-C-5)]2[Ni(i-mnt)2]Cl2}n, which consists of two [Mg(15-C-5)]2+ complex cations, one [Ni(i-mnt)2]2− complex anion and two Cl− ions per formula unit. In the [Ni(i-mnt)2]2− complex anion, Ni2+ is located on a crystallographic mirror plane with a slightly distorted square-planar coordination by four S atoms. In the [Mg(15-C-5)]2+ complex cations, the Mg and one O atom of the crown lie on mirror planes and the Mg atoms are in sevenfold coordination environments of five O atoms from the crown and two N atoms from two i-mnt anions. The bridging of the two complexes via the Mg—N bonds leads to the formation of one-dimensional chains along the a axis.
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Affiliation(s)
- Junli Yang
- School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, People's Republic of China
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Krasovskiy A, Straub BF, Knochel P. Highly Efficient Reagents for Br/Mg Exchange. Angew Chem Int Ed Engl 2006; 45:159-62. [PMID: 16307460 DOI: 10.1002/anie.200502220] [Citation(s) in RCA: 209] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Arkady Krasovskiy
- Department Chemie und Biochemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany
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11
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Krasovskiy A, Straub BF, Knochel P. Hocheffiziente Reagentien für den Brom-Magnesium-Austausch. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200502220] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Sanchez ER, Caudle MT. Evidence for ditopic coordination of phosphate diesters to [Mg(15-crown-5)]2+. Implications for magnesium biocoordination chemistry. J Biol Inorg Chem 2004; 9:724-32. [PMID: 15241659 DOI: 10.1007/s00775-004-0568-6] [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] [Received: 05/07/2004] [Accepted: 05/27/2004] [Indexed: 10/26/2022]
Abstract
The interaction of a series of phosphate diesters and triesters (1=diphenyl phosphate,2=dimethyl phosphate,3=bis(2-ethylhexyl) phosphate,4=trimethyl phosphate,5=methyldiphenyl phosphate,6=triphenyl phosphate) with [Mg(15-crown-5)](2+) (15-crown-5=1,4,7,10,13-pentaoxocyclopentadecane) was studied as a simplified model for the interaction of aqueous Mg(2+) ion with phosphate-containing biomolecules such as RNA. Using electrospray mass spectrometry, we confirm the formation of 1:1 adducts in the gas phase. Proton and (31)P NMR titration data were used to construct binding isotherms, and a 1:1 binding equilibrium was fit to the isotherms at room temperature to estimate the binding affinities. The binding affinity data are consistent with ditopic coordination of neutral dialkyl phosphate ligands to the [Mg(15-crown-5)](2+) unit. This involves inner-sphere coordination to the Mg(2+) via an oxygen atom, which is complemented by a weak hydrogen-bonding interaction with the crown ether ligand. Ditopic interaction is consistent with low-temperature NMR spectra showing four different configurations for1 coordinated to [Mg(15-crown-5)](2+), which are interpreted in terms of hindered rotation around the Mg-O(phos) bond. Thermochemical analysis of the binding affinity data suggests that the second-shell interaction contributes only about 1 kcal/mol to the binding free energy, so additional factors, such as steric constraints, must be operative to give a preferred phosphate orientation in this system. However, the experimental data do suggest that second-shell interactions contribute as much as 40% of the total binding energy, consistent with the pronounced ability of aqueous Mg(2+) to form salt-bridges linking secondary and tertiary elements of RNA structure.
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Affiliation(s)
- Elizabeth R Sanchez
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287-1604, USA
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Proni G, Pescitelli G, Huang X, Nakanishi K, Berova N. Magnesium Tetraarylporphyrin Tweezer: a CD-Sensitive Host for Absolute Configurational Assignments of α-Chiral Carboxylic Acids. J Am Chem Soc 2003; 125:12914-27. [PMID: 14558840 DOI: 10.1021/ja036294g] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A protocol to determine the absolute configuration of alpha-chiral carboxylic acids based on a modified circular dichroic (CD) exciton chirality method has been developed. The protocol relies on a host-guest complexation mechanism: the chiral substrates are derivatized to give bifunctional amide conjugates ("guests") that form complexes with a dimeric magnesium porphyrin host, Mg-T (T stands for "tweezer") that acts as a "receptor". The two porphyrins in the complex adopt a preferred helicity dictated by the substituents at the chiral center in accordance with their steric sizes (assigned on the basis of conformational energy A-values) and, consequently, with the absolute configuration of the substrates under investigation. This chiroptical method, verified with a variety of chiral substrates, has been demonstrated to be reliable and generally applicable, including natural products with complex structures. Molecular modeling, NMR, and FTIR experiments of selected host-guest complexes revealed the mode of ligation of the substrates to the magnesium porphyrin species and led to clarification of the structure of the complex. When oxygen functionalities were directly attached to the chiral center, the signs of the CD couplets were opposite to those predicted on the basis of steric size. NMR and molecular modeling experiments indicated that this apparent inconsistency was due to conformational characteristics of the guest molecules. The stereochemical analysis is shown to be a sensitive technique, not only for the determination of absolute configurations of substrates but also for elucidation of their solution conformations.
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Affiliation(s)
- Gloria Proni
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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Xia A, Heeg MJ, Winter CH. Synthesis and characterization of cyclopentadienyl thiolato complexes of magnesium. J Organomet Chem 2003. [DOI: 10.1016/s0022-328x(02)02194-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Sanchez ER, Gessel MC, Groy TL, Caudle MT. Interaction of biotin with Mg-O bonds: bifunctional binding and recognition of biotin and related ligands by the Mg(15-crown-5)2+ unit. J Am Chem Soc 2002; 124:1933-40. [PMID: 11866606 DOI: 10.1021/ja016641r] [Citation(s) in RCA: 20] [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
The interaction between biotin and the macrocyclic magnesium complex Mg(15-crown-5)(Otf)2 (15-crown-5 is 1,4,7,10,13-pentaoxacyclopentadecane, Otf(-) is trifluoromethanesulfonate anion) in solution was studied as a model for metal-biotin interactions that may be important in its speciation and function. Shifts in the solution IR spectrum establish that the interaction is dominated by ligation between the carbonyl oxygen of the ureido ring of biotin and the Mg2+ cation. However, comparative binding studies using NMR spectroscopy and conductivity reveal a substantial enthalpic contribution to binding that arises from interactions between the ureido -NH moiety and the macrocyclic ring. This is interpreted in terms of a weak-to-moderate hydrogen bond formed between the -NH group and an oxygen from the crown, which is simultaneously coordinated to Mg2+. This hypothesis is reinforced by quantitative examination of the binding of N-methylated derivatives of 2-imidazolidone, which shows that N,N'-dimethylation decreases the affinity of Mg(15-crown-5)(Otf)2 for the ligand by 2 orders of magnitude. This can be understood in terms of the structure of Mg(15-crown-5)(Otf)2. It shows a pentagonal bipyramidal coordination geometry where the five equatorial positions are occupied by the macrocyclic oxygen donors. The axial positions are occupied by weakly coordinating Otf(-) anions, which are readily displaced by biotin and related derivatives. The M-O(crown) bond distance ranges from 2.1 to 2.3 A, providing structural complementarity for the 2.2 A C=O...HN- bite distance in the ureido group, which leads to strong interaction. The contribution from hydrogen bonding illustrates the importance of second-shell interactions in the biocoordination chemistry of Mg2+. These can serve to organize cofactor interactions with biomolecules, as was recently demonstrated for a biotin-selective RNA aptamer that depends on a direct biotin-magnesium interaction for recognition of biotin (Nix, J.; Sussman, D.; Wilson, C. J. Mol. Biol. 2000, 296, 1235-1244). These results are significant in the context of the observed magnesium requirement in biotin-dependent carboxylase enzymes, where noncovalent interactions with biotin may be important in its activation toward carboxylation in the first step of biotin-dependent CO2 transfer. The synthetic system presented here also suggests that the Mg-O bond may be considered a constituent design element in the rational preparation of complexes to bind and recognize biotin.
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Affiliation(s)
- Elizabeth R Sanchez
- Department of Chemistry and Biochemistry, Arizona State University, Box 871604, Tempe, Arizona 85287-1604, USA
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Englich U, Ruhlandt-Senge K. Thiolates, selenolates, and tellurolates of the s-block elements. Coord Chem Rev 2000. [DOI: 10.1016/s0010-8545(00)00319-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
The synthesis and structural characterization of a family of barium thiolates and selenolates is described. The thiolates were synthesized by metallation of thiols, the selenolates by reductive insertion of the metal into the selenium-selenium bond of diorganodiselenides. Both reaction sequences were carried out by using barium metal dissolved in ammonia; this afforded barium thiolates and selenolates in good yield and purity. The structural principles displayed in the target compounds span a wide range of solid-state formulations, including monomeric and dimeric species, and separated ion triples, namely [Ba(thf)4(SMes*)2] (1; Mes* = 2,4,6-tBU3C6H2), [Ba(thf)4(SeMes*)2] (2), [Ba([18]crown-6)(hmpa)2][(SeMes*)2] (3), the dimeric [(Ba(py)3(thf)(SeTrip)2)2] (4; py = pyridine, Trip = 2,4.6-iPr3C6H2), and [Ba([18]crown-6)(SeTrip)2] (5). The full range of association modes is completed by [Ba([18]crown-6)(hmpa)SMes*][SMes*] (6) communicated earlier by this group. In the solid state, this compound displays an intermediate ion coordination mode: one anion is bound to the metal, while the second one is unassociated. Together these compounds provide structural information about all three different association modes for alkaline earth metal derivatives. This collection of structural data allows important conclusions about the influence of solvation and ligation on structural trends.
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Affiliation(s)
- K Ruhlandt-Senge
- Department of Chemistry, Syracuse University, Center for Science and Technology, NY 13244-4100, USA.
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Teng W, Englich U, Ruhlandt-Senge K. Syntheses, structures, and reactivities of heteroleptic magnesium amide thiolates. Inorg Chem 2000; 39:3875-80. [PMID: 11196783 DOI: 10.1021/ic9913738] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The syntheses and characterizations of a family of novel heteroleptic magnesium amide thiolates are presented. The compounds are synthesized by ligand redistribution chemistry involving reactions of equimolar amounts of magnesium amides and magnesium thiolates. Utilization of the smaller thiolates [Mg(SPh)2]n and [Mg(S-2,4,6-iPr3C6H2)2]n results in the isolation of dimeric species, [Mg(THF)(N(SiMe3)2)(mu-SR)]2 (R = Ph (1), 2,4,6-iPr3C6H2 (2)), with four-coordinate metal centers and bridging thiolate functions. The sterically more encumbered thiolate S-2,4,6-tBu3C6H2 induces the formation of the four-coordinate, monomeric species Mg(THF)2(N(SiMe3)2)(S-2,4,6-tBu3C6H2) (3)). Careful choice of reaction conditions allows the successful syntheses of pure heteroleptic compounds; however, it remains difficult to obtain the compounds in high yields, since a tendency toward product symmetrization and ligand redistribution under re-formation of the starting materials is prevalent. One of these symmetrized products is also included in this report: the dimeric, four-coordinate magnesium thiolate [Mg-(THF)(S-2,4,6-tBu3C6H2)(mu-S-2,4,6-tBu3C6H2)]2 (4), isolated as the product of the reaction between [Mg-(N(SiMe3)2)2]2 and Mg(THF)2(S-2,4,6-tBu3C6H2)2. All compounds were characterized by NMR and IR spectroscopy, elemental analyses, and X-ray crystallography. Crystal data obtained with Mo K alpha (lambda = 0.710 73 A) radiation are as follows. 1: C16H31MgNOSSi2, a = 11.2100(1) A, b = 17.4512(3) A, c = 11.2999(2) A, beta = 97.952(1) degrees, V = 2189.32(6) A3, Z = 4, monoclinic, space group P2(1)/n, R1 (all data) = 0.0934. 2: C25H49MgNOSSi2, a = 11.1691(1) A, b = 11.0578(1) A, c = 26.0671(4) A, beta = 99.906(1) degrees, V = 3171.44(6) A3, Z = 4, monoclinic, space group P2(1)/c, R1 (all data) = 0.0557. 3: C36H71MgNO3SSi2, a = 42.8293(16) A, b = 10.9737(5) A, c = 16.8305(7) A, beta = 98.755(3) degrees, V = 7818.1(6) A3, Z = 8, monoclinic, space group C2/c, R1 (all data) = 0.1331. 4: C80H132Mg2O2S4, a = 18.8806(2) A, b = 19.3850(2) A, c = 27.3012(4) A, beta = 97.250(1) degrees, V = 9912.4(2) A3, Z = 4, monoclinic, space group P2(1)/n, R1 (all data) = 0.1023.
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Affiliation(s)
- W Teng
- Department of Chemistry and W.M. Keck Center for Molecular Electronics, Center for Science and Technology, Syracuse University, Syracuse, New York 13244-4100, USA
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