1
|
Taut J, Chambron J, Kersting B. Fifty Years of Inorganic Biomimetic Chemistry: From the Complexation of Single Metal Cations to Polynuclear Metal Complexes by Multidentate Thiolate Ligands. Eur J Inorg Chem 2023. [DOI: 10.1002/ejic.202200739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Affiliation(s)
- Josef Taut
- Institut für Anorganische Chemie Universität Leipzig Johannisallee 29 04103 Leipzig Germany
- Institut de Chimie de Strasbourg UMR 7177 CNRS-Université de Strasbourg 1, rue Blaise Pascal 67008 Strasbourg France
| | - Jean‐Claude Chambron
- Institut de Chimie de Strasbourg UMR 7177 CNRS-Université de Strasbourg 1, rue Blaise Pascal 67008 Strasbourg France
| | - Berthold Kersting
- Institut für Anorganische Chemie Universität Leipzig Johannisallee 29 04103 Leipzig Germany
| |
Collapse
|
2
|
Schmorl S, Naumov S, Abel B, Börner M, Pöppl A, Kersting B. Metalloligands based on Robson-type amino-thiophenolato macrocycles for assembly of heterotrimetallic complexes. Dalton Trans 2021; 50:5784-5788. [PMID: 33890608 DOI: 10.1039/d1dt00723h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ability of macrocyclic Co and Ni aminothiolate complexes to act as metalloligands towards cuprate ions was established. Adduct formation is enabled by a thiolate-to-Cu+ charge transfer (CT) interaction giving stable heterotrimetallics with magnetic properties.
Collapse
Affiliation(s)
- Sara Schmorl
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.
| | - Sergej Naumov
- Leibniz-Institut für Oberflächenmodifizierung (IOM), Abteilung Funktionale Oberflächen, Permoserstr. 15, D-04318 Leipzig, Germany
| | - Bernd Abel
- Leibniz-Institut für Oberflächenmodifizierung (IOM), Abteilung Funktionale Oberflächen, Permoserstr. 15, D-04318 Leipzig, Germany and Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnéstraße 2, D-04103 Leipzig, Germany
| | - Martin Börner
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany. and Leibniz-Institut für Oberflächenmodifizierung (IOM), Abteilung Funktionale Oberflächen, Permoserstr. 15, D-04318 Leipzig, Germany
| | - Andreas Pöppl
- Fakultät für Physik und Geowissenschaften, Linnestr.3, D-04103 Leipzig, Germany
| | - Berthold Kersting
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.
| |
Collapse
|
3
|
Yue K, Guo YH, Pan JQ, He K, Qiao YY, Li QS, Xu FB. Novel self-adaptive boat-shaped complexes with a tetraphosphine ligand. Dalton Trans 2018; 47:13689-13695. [PMID: 30209484 DOI: 10.1039/c8dt02498g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A series of novel boat-shaped host-guest complexes were designed and synthesized by the combination of a new calixarene fragment-based tetraphosphine ligand L with group 11 metal salts Cu(MeCN)4ClO4 and AgNO3 in a self-assembly process, and by the following anion exchange reactions of complex 1 with sodium p-toluenesulfonate, AcONa, PhCO2Na and sodium 9-anthrylcarboxylate. The host with a novel boat-shaped cavity is capable of self-adaptive encapsulation of various anions of different sizes through M(i)-O coordinations and CHπ interactions between the host and guest anion. The DFT calculations confirmed that the CHπ interaction played a vital role in the self-adaptive phenomenon in complexes 4-6.
Collapse
Affiliation(s)
- Kai Yue
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, P. R. China.
| | | | | | | | | | | | | |
Collapse
|
4
|
Beyer N, Steinfeld G, Lozan V, Naumov S, Flyunt R, Abel B, Kersting B. Structure and Bonding in Nickel-Thiolate-Iodine Charge-Transfer Complexes. Chemistry 2016; 23:2303-2314. [DOI: 10.1002/chem.201604460] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Norman Beyer
- Institut für Anorganische Chemie; Universität Leipzig; 04103 Leipzig Germany
| | - Gunther Steinfeld
- Institut für Anorganische Chemie; Universität Leipzig; 04103 Leipzig Germany
| | - Vasile Lozan
- Institut für Anorganische Chemie; Universität Leipzig; 04103 Leipzig Germany
| | - Sergej Naumov
- Leibniz-Institut für Oberflächenmodifizierung e.V.; Chemische Abteilung; 04318 Leipzig Germany
| | - Roman Flyunt
- Leibniz-Institut für Oberflächenmodifizierung e.V.; Chemische Abteilung; 04318 Leipzig Germany
| | - Bernd Abel
- Leibniz-Institut für Oberflächenmodifizierung e.V.; Chemische Abteilung; 04318 Leipzig Germany
| | - Berthold Kersting
- Institut für Anorganische Chemie; Universität Leipzig; 04103 Leipzig Germany
| |
Collapse
|
5
|
Verschoor-Kirss MJ, Hendricks O, Verschoor CM, Conry R, Kirss RU. Chemical oxidation of ferrocenyl(phenyl)phosphines and ferrocenyl(phenyl)phosphine chalcogenides. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.05.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
6
|
Golecki M, Beyer N, Steinfeld G, Lozan V, Voitekhovich S, Sehabi M, Möllmer J, Krüger HJ, Kersting B. Adsorption von I2durch makrocyclische Polyaza-Dithiophenolato-Komplexe unter Bildung von Charge-Transfer-Addukten. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405199] [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]
|
7
|
Golecki M, Beyer N, Steinfeld G, Lozan V, Voitekhovich S, Sehabi M, Möllmer J, Krüger HJ, Kersting B. Adsorption of I2by Macrocyclic Polyazadithiophenolato Complexes Mediated by Charge-Transfer Interactions. Angew Chem Int Ed Engl 2014; 53:9949-52. [DOI: 10.1002/anie.201405199] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 11/09/2022]
|
8
|
Fleischmann M, Welsch S, Krauss H, Schmidt M, Bodensteiner M, Peresypkina EV, Sierka M, Gröger C, Scheer M. Complexes of monocationic Group 13 elements with pentaphospha- and pentaarsaferrocene. Chemistry 2014; 20:3759-68. [PMID: 24615817 DOI: 10.1002/chem.201304466] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Indexed: 11/08/2022]
Abstract
Reactions of the sandwich complexes [Cp*Fe(η(5)-E5)] (Cp*=η(5)-C5Me5; E=P (1), As (2)) with the monovalent Group 13 metals Tl(+), In(+), and Ga(+) containing the weakly coordinating anion [TEF] ([TEF]=[Al{OC(CF3)3}4](-)) are described. Here, the one-dimensional coordination polymers [M(μ,η(5):η(1 -E5 FeCp*)3]n [TEF]n (E=P, M=Tl (3 a), In (3 b), Ga (3 c); E=As, M=Tl (4 a), In (4 b)) are obtained as sole products in good yields. All products were analyzed by single-crystal X-ray diffraction, revealing a similar assembly of the products with η(5)-bound E5 ligands and very weak σ-interactions between one P or As atom of the ring to the neighbored Group 13 metal cation. By exchanging the [TEF] anion of 4 a for the larger [FAl] anion ([FAl]=[FAl{OC6F10(C6F5)}3](-)), the coordination compound [Tl{(η(5)-As5)FeCp*}3][FAl] (5) without any σ-interactions of the As5-ring is obtained. All products are readily soluble in CH2 Cl2 and exhibit a dynamic coordination behavior in solution, which is supported by NMR spectroscopy and ESI-MS spectrometry as well as by osmometric molecular-weight determination. For a better understanding of the proceeding equilibrium DFT calculations of the cationic complexes were performed for the gas phase and in solution. Furthermore, the (31)P{(1)H} magic-angle spinning (MAS) NMR spectra of 3 a-c are presented and the first crystal structure of the starting material 2 was determined.
Collapse
Affiliation(s)
- Martin Fleischmann
- Institut für Anorganische Chemie, Universität Regensburg, 93040 Regensburg (Germany), Fax: (+49) 941-943-4439
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Malberg J, Bodensteiner M, Paul D, Wiegand T, Eckert H, Wolf R. Preparation of an Organometallic Molecular Square by Self-Assembly of Phosphorus-Containing Building Blocks. Angew Chem Int Ed Engl 2014; 53:2771-5. [DOI: 10.1002/anie.201309493] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Indexed: 11/07/2022]
|
10
|
Malberg J, Bodensteiner M, Paul D, Wiegand T, Eckert H, Wolf R. Synthese eines metallorganischen molekularen Quadrats durch Selbstorganisation phosphorhaltiger Baueinheiten. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201309493] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
11
|
Benzodicarbene-bridged dinuclear complexes as building blocks for metalosupramolecular architectures. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.08.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
12
|
Golecki M, Lach J, Jeremies A, Lungwitz F, Fronk M, Salvan G, Zahn DRT, Park J, Krupskaya Y, Kataev V, Klingeler R, Büchner B, Mahns B, Knupfer M, Siles PF, Grimm D, Schmidt OG, Reis A, Thiel WR, Breite D, Abel B, Kersting B. Chemisorption of exchange-coupled [Ni2L(dppba)]+ complexes on gold by using ambidentate 4-(diphenylphosphino)benzoate co-ligands. Chemistry 2013; 19:7787-801. [PMID: 23595564 DOI: 10.1002/chem.201300496] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Indexed: 11/09/2022]
Abstract
A new strategy for the fixation of redox-active dinickel(II) complexes with high-spin ground states to gold surfaces was developed. The dinickel(II) complex [Ni2L(Cl)]ClO4 (1ClO4), in which L(2-) represents a 24-membered macrocyclic hexaaza-dithiophenolate ligand, reacts with ambidentate 4-(diphenylphosphino)benzoate (dppba) to form the carboxylato-bridged complex [Ni2L(dppba)](+), which can be isolated as an air-stable perchlorate [Ni2L(dppba)]ClO4 (2ClO4) or tetraphenylborate [Ni2L(dppba)]BPh4 (2BPh4) salt. The auration of 2ClO4 was probed on a molecular level, by reaction with AuCl, which leads to the monoaurated Ni(II)2Au(I) complex [Ni(II)2L(dppba)Au(I)Cl]ClO4 (3ClO4). Metathesis of 3ClO4 with NaBPh4 produces [Ni(II)2L(dppba)Au(I)Ph]BPh4 (4BPh4), in which the Cl(-) is replaced by a Ph(-) group. The complexes were fully characterized by ESI mass spectrometry, IR and UV/Vis spectroscopy, X-ray crystallography (2BPh4 and 4BPh4), cyclic voltammetry, SQUID magnetometry and HF-ESR spectroscopy. Temperature-dependent magnetic susceptibility measurements reveal a ferromagnetic coupling J = +15.9 and +17.9 cm(-1) between the two Ni(II) ions in 2ClO4 and 4BPh4 (H = -2 JS1S2). HF-ESR measurements yield a negative axial magnetic anisotropy (D<0), which implies a bistable (easy axis) magnetic ground state. The binding of the [Ni2L(dppba)]ClO4 complex to gold was ascertained by four complementary surface analytical methods: contact angle measurements, atomic-force microscopy, X-ray photoelectron spectroscopy, and spectroscopic ellipsometry. The results indicate that the complexes are attached to the Au surface through coordinative Au-P bonds in a monolayer.
Collapse
Affiliation(s)
- Matthias Golecki
- Institut für Anorganische Chemie, Universität Leipzig, 04103 Leipzig, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Schmidtendorf M, Pape T, Hahn FE. Molecular rectangles from platinum(ii) and bridging dicarbene, diisocyanide and 4,4′-bipyridine ligands. Dalton Trans 2013; 42:16128-41. [DOI: 10.1039/c3dt51813b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
14
|
Schmidtendorf M, Pape T, Hahn FE. Stufenweise Synthese eines molekularen Quadrats mit NR,NR- und NH,O-substituierten Dicarbenbausteinen. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107227] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
15
|
Schmidtendorf M, Pape T, Hahn FE. Stepwise Preparation of a Molecular Square from NR,NR- and NH,O-Substituted Dicarbene Building Blocks. Angew Chem Int Ed Engl 2012; 51:2195-8. [DOI: 10.1002/anie.201107227] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 11/23/2011] [Indexed: 11/09/2022]
|
16
|
Conrady FM, Fröhlich R, Schulte to Brinke C, Pape T, Hahn FE. Stepwise Formation of a Molecular Square with Bridging NH,O-Substituted Dicarbene Building Blocks. J Am Chem Soc 2011; 133:11496-9. [DOI: 10.1021/ja205021p] [Citation(s) in RCA: 132] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fabian M. Conrady
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| | - Roland Fröhlich
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - Christian Schulte to Brinke
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| | - Tania Pape
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| | - F. Ekkehardt Hahn
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| |
Collapse
|
17
|
Desbenoît N, Galardon E, Frapart Y, Tomas A, Artaud I. Reductive metalation of cyclic and acyclic pseudopeptidic bis-disulfides and back conversion of the resulting diamidato/dithiolato complexes to bis-disulfides. Inorg Chem 2011; 49:8637-44. [PMID: 20718487 DOI: 10.1021/ic101148c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclic and acyclic pseudopeptidic bis-disulfides built on an o-phenylene diamine scaffold were prepared: (N(2)H(2)S(2))(2), 1a, N(2)H(2)(S-SCH(3))(2), 1b, and N(2)H(2)(S-StBu)(2), 1c. Reductive metalation of these disulfides with (PF(6))[Cu(CH(3)CN)(4)] in the presence of Et(4)NOH as a base, or with (Et(4)N)[Fe(SEt)(4)] and Et(4)NCl, yields the corresponding diamidato/dithiolato copper(III) or iron(III) complex, (Et(4)N)[Cu(N(2)S(2))], 2, or (Et(4)N)(2)[Fe(N(2)S(2))Cl], 5. These complexes display characteristics similar to those previously described in the literature. The mechanism of the metalation with copper has been investigated by X-band electron paramagnetic resonance (EPR) spectroscopy at 10 K. After metalation of the bis-disulfide 1c and deprotonation of the amide nitrogens, the reductive cleavage of the S-S bonds occurs by two one-electron transfers leading to the intermediate formation of a copper(II) complex and a thyil radical. Complexes 2 and 5 can be converted back to the cyclic bis-disulfide 1a with iodine in an 80% yield. Reaction of 5 with iodine in the presence of CH(3)S-SCH(3) affords a 1/1 mixture of the acyclic N(2)H(2)(S-SCH(3))(2) disulfide 1b and cyclic bis-disulfide 1a. From 2, the reaction was monitored by (1)H NMR and gives 1b as major product. While there is no reaction of 2 or 5 with tBuS-StBu and iodine, reaction with an excess of tBuSI affords quantitatively the di-tert-butyl disulfide 1c. To assess the role of the Cu(III) oxidation state, control experiments were carried out under strictly anaerobic conditions with the copper(II) complex, (Et(4)N)(2)[Cu(N(2)S(2))], 6. Complex 6 is oxidized to 2 by iodine, and it reacts with an excess of tBuSI, yielding 1c as final product, through the intermediate formation of complex 2.
Collapse
Affiliation(s)
- Nicolas Desbenoît
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, Université Paris Descartes, UMR 8601, CNRS, 45 rue des Saints Pères, 75270 Paris Cedex 06, France
| | | | | | | | | |
Collapse
|
18
|
Rit A, Pape T, Hepp A, Hahn FE. Supramolecular Structures from Polycarbene Ligands and Transition Metal Ions. Organometallics 2010. [DOI: 10.1021/om101102j] [Citation(s) in RCA: 161] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arnab Rit
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| | - Tania Pape
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| | - Alexander Hepp
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| | - F. Ekkehardt Hahn
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany
| |
Collapse
|
19
|
Lehmann U, Klingele J, Lozan V, Steinfeld G, Klingele MH, Käss S, Rodenstein A, Kersting B. Dependence of the Chemical Properties of Macrocyclic [NiII2L(μ-O2CR)]+Complexes on the Basicity of the Carboxylato Coligands (L2−= macrocyclic N6S2ligand). Inorg Chem 2010; 49:11018-29. [DOI: 10.1021/ic101574a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ulrike Lehmann
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Julia Klingele
- Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, D-79104 Freiburg, Germany
| | - Vasile Lozan
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Gunther Steinfeld
- Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, D-79104 Freiburg, Germany
| | - Marco H. Klingele
- Institut für Anorganische und Analytische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, D-79104 Freiburg, Germany
| | - Steffen Käss
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Axel Rodenstein
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Berthold Kersting
- Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| |
Collapse
|
20
|
Krupskaya Y, Alfonsov A, Parameswaran A, Kataev V, Klingeler R, Steinfeld G, Beyer N, Gressenbuch M, Kersting B, Büchner B. Interplay of magnetic exchange interactions and Ni-S-Ni bond angles in polynuclear nickel(II) complexes. Chemphyschem 2010; 11:1961-70. [PMID: 20408157 DOI: 10.1002/cphc.200900935] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The ability of bridging thiophenolate groups (RS(-)) to transmit magnetic exchange interactions between paramagnetic Ni(II) ions is examined. Specific attention is paid to complexes with large Ni-SR-Ni angles. For this purpose, dinuclear [Ni(2)L(1)(mu-OAc)I(2)][I(5)] (2) and trinuclear [Ni(3)L(2)(OAc)(2)][BPh(4)](2) (3), where H(2)L(1) and H(2)L(2) represent 24-membered macrocyclic amino-thiophenol ligands, are prepared and fully characterized by IR- and UV/Vis spectroscopy, X-ray crystallography, static magnetization M measurements and high-field electron spin resonance (HF-ESR). The dinuclear complex 2 has a central N(3)Ni(2)(mu-S)(2)(mu-OAc)Ni(2)N(3) core with a mean Ni-S-Ni angle of 92 degrees . The macrocycle L(2) supports a trinuclear complex 3, with distorted octahedral N(2)O(2)S(2) and N(2)O(3)S coordination environments for one central and two terminal Ni(II) ions, respectively. The Ni-S-Ni angles are at 132.8 degrees and 133.5 degrees . We find that the variation of the bond angles has a very strong impact on the magnetic properties of the Ni complexes. In the case of the Ni(2)-complex, temperature T and magnetic field B dependencies of M reveal a ferromagnetic coupling J=-29 cm(-1) between two Ni(II) ions (H=JS(1)S(2)). HF-ESR measurements yield a negative axial magnetic anisotropy (D<0) which implies a bistable (easy axis) magnetic ground state. In contrast, for the Ni(3)-complex we find an appreciable antiferromagnetic coupling J'=97 cm(-1) between the Ni(II) ions and a positive axial magnetic anisotropy (D>0) which implies an easy plane situation.
Collapse
Affiliation(s)
- Yulia Krupskaya
- Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany.
| | | | | | | | | | | | | | | | | | | |
Collapse
|