1
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Mortis A, Barisic D, Eichele K, Maichle-Mössmer C, Anwander R. Scandium bis(trimethylsilyl)methyl complexes revisited: extending the 45Sc NMR chemical shift range and a new structural motif of Li[CH(SiMe 3) 2]. Dalton Trans 2020; 49:7829-7841. [PMID: 32463406 DOI: 10.1039/d0dt01247e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Depending on the molar ratio employed, the reaction of ScCl3(thf)3 with Li[CH(SiMe3)2] afforded the bis and tris(alkyl) ate complexes [Sc{CH(SiMe3)2}2(μ-Cl)2Li(thf)2]2 and Sc[CH(SiMe3)2]3(μ-Cl)Li(thf)3, respectively, in moderate yields. Treatment of these mixed alkyl/chlorido complexes with MeLi gave the mixed alkyl complexes [Sc{CH(SiMe3)2}2(μ-Me)2Li(thf)2]2 and Sc[CH(SiMe3)2]3(μ-Me)Li(thf)3. Aiming at homoleptic {Sc[CH(SiMe3)2]3} both of the mixed [CH(SiMe3)2]/Me complexes were treated with AlMe3. Although LiAlMe4 separation occurred, aluminium complex Al[CH(SiMe3)2]Me2(thf) was the only isolable crystalline complex. Ate complexes [Sc{CH(SiMe3)2}2(μ-Me)2Li(thf)2]2 and [Sc(CH2SiMe3)4][Li(thf)4] revealed the maximum downfield 45Sc NMR chemical shifts of 888.0 and 933.4 ppm, respectively, reported to date. The synthesis of putative {Sc[CH(SiMe3)2]3} was also attempted via the aryloxide route applying complexes Sc(OC6H2tBu2-2,6-Me-4)3 and [Sc(OC6H3iPr2-2,6)3]2 along with Li[CH(SiMe3)2] but the outcome was inconclusive. Instead, a cyclic octamer was found for Li[CH(SiMe3)2] in the solid state.
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Affiliation(s)
- Alexandros Mortis
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
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2
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Thompson CV, Tonzetich ZJ. Pincer ligands incorporating pyrrolyl units: Versatile platforms for organometallic chemistry and catalysis. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2020.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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3
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Gao X, Zhang CL, Fu AY. Crystal structure of di-μ 2-aqua-tetraaqua-bis(4-(1 H-1,2,4-triazol-1-yl)benzoato-κ N)disodium(I) C 18H 24N 6Na 2O 10. Z KRIST-NEW CRYST ST 2018. [DOI: 10.1515/ncrs-2017-0225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
C18H24N6Na2O10, triclinic, P1̄, a = 6.223(2) Å, b = 7.385(2) Å, c = 14.295(4) Å, α = 75.491(6)°, β = 77.953(6)°, γ = 70.523(6)°, V = 593.9(3) Å3, Z = 1, R
gt(F) = 0.0517, wR
ref(F
2) = 0.1533, T = 296(2) K.
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Affiliation(s)
- Xiaonan Gao
- College of Chemistry, Chemical Engineering and Materials Science , Shandong Normal University , Jinan 250014 , P.R. China
| | - Cun-Lan Zhang
- College of Chemistry, Chemical Engineering and Materials Science , Shandong Normal University , Jinan 250014 , P.R. China
| | - Ai-Yun Fu
- Institute of Apply Technology , Dezhou University , Dezhou, 253023, Shandong , P.R. China
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4
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Engelhardt F, Maaß C, Andrada DM, Herbst-Irmer R, Stalke D. Benchmarking lithium amide versus amine bonding by charge density and energy decomposition analysis arguments. Chem Sci 2018; 9:3111-3121. [PMID: 29732094 PMCID: PMC5916014 DOI: 10.1039/c7sc05368a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 01/30/2018] [Indexed: 12/26/2022] Open
Abstract
We investigated [{(Me2NCH2)2(C4H2N)}Li]2 (1) by means of experimental charge density calculations based on the quantum theory of atoms in molecules (QTAIM) and DFT calculations using energy decomposition analysis (EDA).
Lithium amides are versatile C–H metallation reagents with vast industrial demand because of their high basicity combined with their weak nucleophilicity, and they are applied in kilotons worldwide annually. The nuclearity of lithium amides, however, modifies and steers reactivity, region- and stereo-selectivity and product diversification in organic syntheses. In this regard, it is vital to understand Li–N bonding as it causes the aggregation of lithium amides to form cubes or ladders from the polar Li–N covalent metal amide bond along the ring stacking and laddering principle. Deaggregation, however, is more governed by the Li←N donor bond to form amine adducts. The geometry of the solid state structures already suggests that there is σ- and π-contribution to the covalent bond. To quantify the mutual influence, we investigated [{(Me2NCH2)2(C4H2N)}Li]2 (1) by means of experimental charge density calculations based on the quantum theory of atoms in molecules (QTAIM) and DFT calculations using energy decomposition analysis (EDA). This new approach allows for the grading of electrostatic Li+N–, covalent Li–N and donating Li←N bonding, and provides a way to modify traditional widely-used heuristic concepts such as the –I and +I inductive effects. The electron density ρ(r) and its second derivative, the Laplacian ∇2ρ(r), mirror the various types of bonding. Most remarkably, from the topological descriptors, there is no clear separation of the lithium amide bonds from the lithium amine donor bonds. The computed natural partial charges for lithium are only +0.58, indicating an optimal density supply from the four nitrogen atoms, while the Wiberg bond orders of about 0.14 au suggest very weak bonding. The interaction energy between the two pincer molecules, (C4H2N)22–, with the Li22+ moiety is very strong (ca. –628 kcal mol–1), followed by the bond dissociation energy (–420.9 kcal mol–1). Partitioning the interaction energy into the Pauli (ΔEPauli), dispersion (ΔEdisp), electrostatic (ΔEelstat) and orbital (ΔEorb) terms gives a 71–72% ionic and 25–26% covalent character of the Li–N bond, different to the old dichotomy of 95 to 5%. In this regard, there is much more potential to steer the reactivity with various substituents and donor solvents than has been anticipated so far.
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Affiliation(s)
- Felix Engelhardt
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany
| | - Christian Maaß
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany
| | - Diego M Andrada
- Krupp-Chair of General and Inorganic Chemistry , Universität des Saarlandes , Campus Gebäude C4.1 , 66123 Saarbrücken , Germany . ;
| | - Regine Herbst-Irmer
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany
| | - Dietmar Stalke
- Institut für Anorganische Chemie , Georg-August-Universität Göttingen , Tammannstraße 4 , 37077 Göttingen , Germany
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5
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Jana O, Mani G. New types of Cu and Ag clusters supported by the pyrrole-based NNN-pincer type ligand. NEW J CHEM 2017. [DOI: 10.1039/c7nj01009e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While the neutral ligand 2,5-bis(3,5-dimethylpyrazolylmethyl)pyrrole gives the dihalide ion bridged binuclear and coordination polymers, its anionic form affords a new type of tetranuclear ‘hourglass’ shaped copper(i) and triangular silver(i) clusters owing to its increased denticity.
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Affiliation(s)
- Oishi Jana
- Department of Chemistry
- Indian Institute of Technology – Kharagpur
- Kharagpur
- India
| | - Ganesan Mani
- Department of Chemistry
- Indian Institute of Technology – Kharagpur
- Kharagpur
- India
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6
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Guo Z, Li P, Feng P, Liu K, Wei X. 2,5-Bis[(dimethylamino)methyl]-1 H-pyrrole. IUCRDATA 2016. [DOI: 10.1107/s2414314616016175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The asymmetric unit contains two independent molecules, C10H19N3, which are linked into dimers by two Npyrrole—H...Namine hydrogen bonds.
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7
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Synthesis and structure characterization of bis- and mono(amidate) lanthanide (Ln = La, Gd) complexes and their application in the polymerization of ε-caprolactone. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.01.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Peng KF, Chen Y, Chen CT. Synthesis and catalytic application of magnesium complexes bearing pendant indolyl ligands. Dalton Trans 2016; 44:9610-9. [PMID: 25923231 DOI: 10.1039/c5dt01173f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three novel indole-based ligand precursors [HIndPh(R), R = methoxy, HIndPh(OMe) (); thiomethoxy, HIndPh(SMe) (); and N,N'-dimethylamino, HIndPh(NMe2) ()] have been synthesized via Sonogashira and cyclization reactions with moderate to high yield. Reactions of these ligand precursors with 0.6 equivalent of Mg(n)Bu2 in THF afforded the magnesium bis-indolyl complexes , respectively. All the ligand precursors and related magnesium complexes have been characterized by NMR spectroscopy and elemental analyses. The molecular structures are reported for compounds and . Under optimized conditions, compound demonstrates efficient catalytic activities towards the ring opening polymerization of l-lactide and ε-caprolactone in the presence of BnOH.
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Affiliation(s)
- Kuo-Fu Peng
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan.
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9
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Magnesium Pyrazolyl-Indolyl Complexes as Catalysts for Ring-Opening Polymerization of L-Lactide. Polymers (Basel) 2015. [DOI: 10.3390/polym7101492] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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10
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Wu MC, Hu TC, Lo YC, Lee TY, Lin CH, Lu WY, Lin CC, Datta A, Huang JH. New types of bi- and tri-dentate pyrrole-piperazine ligands and related zinc compounds: Synthesis, characterization, reaction study, and ring-opening polymerization of ε-caprolactone. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.05.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Lithium, magnesium, zinc complexes supported by tridentate pincer type pyrrolyl ligands: Synthesis, crystal structures and catalytic activities for the cyclotrimerization of isocyanates. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.08.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Tridentate pyrrolylzinc compounds: Synthesis, structures, reactivities and catalytic cyclotrimerization reaction of isocyanate. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.11.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Hänninen MM, Zamora MT, Hayes PG. Rare Earth Pincer Complexes: Synthesis, Reaction Chemistry, and Catalysis. TOP ORGANOMETAL CHEM 2015. [DOI: 10.1007/3418_2015_120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Mou Z, Liu B, Liu X, Xie H, Rong W, Li L, Li S, Cui D. Efficient and Heteroselective Heteroscorpionate Rare-Earth-Metal Zwitterionic Initiators for ROP of rac-Lactide: Role of σ-Ligand. Macromolecules 2014. [DOI: 10.1021/ma500209t] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Zehuai Mou
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University
of
Chinese Academy of Sciences, Changchun Branch, Changchun 130022, People’s Republic of China
| | - Bo Liu
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Xinli Liu
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Hongyan Xie
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University
of
Chinese Academy of Sciences, Changchun Branch, Changchun 130022, People’s Republic of China
| | - Weifeng Rong
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University
of
Chinese Academy of Sciences, Changchun Branch, Changchun 130022, People’s Republic of China
| | - Lei Li
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University
of
Chinese Academy of Sciences, Changchun Branch, Changchun 130022, People’s Republic of China
| | - Shihui Li
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Dongmei Cui
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
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15
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Maaß C, Andrada DM, Mata RA, Herbst-Irmer R, Stalke D. Effects of Metal Coordination on the π-System of the 2,5-Bis-{(pyrrolidino)-methyl}-pyrrole Pincer Ligand. Inorg Chem 2013; 52:9539-48. [DOI: 10.1021/ic401192x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Diego M. Andrada
- Instituto de Investigaciones en
Físico-químicas de Córdoba, Departamento de Química
Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria
5016, Córdoba, Argentina
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16
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Bidentate pyrrolyl lithium complexes: Synthesis, crystal structure and catalytic activity for the cyclotrimerization of isocyanates. INORG CHEM COMMUN 2013. [DOI: 10.1016/j.inoche.2013.04.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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18
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Hsiao CS, Wang TY, Datta A, Liao FX, Hu CH, Lin CH, Huang JH, Lee TY. Zinc complexes incorporating with symmetrical and asymmetrical polydentate nitrogen-donor pyrrolyl ligands: Synthesis, characterization, and ring-opening polymerization. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2012.08.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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Wang L, Liu D, Cui D. NNN-Tridentate Pyrrolyl Rare-Earth Metal Complexes: Structure and Catalysis on Specific Selective Living Polymerization of Isoprene. Organometallics 2012. [DOI: 10.1021/om300049h] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lingfang Wang
- State Key Laboratory of Polymer Physics
and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Graduate School of the Chinese Academy of Sciences, Beijing 100039,
China
| | - Dongtao Liu
- State Key Laboratory of Polymer Physics
and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Dongmei Cui
- State Key Laboratory of Polymer Physics
and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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20
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Lu WY, Hsiao MW, Hsu SCN, Peng WT, Chang YJ, Tsou YC, Wu TY, Lai YC, Chen Y, Chen HY. Synthesis, characterization and catalytic activity of lithium and sodium iminophenoxide complexes towards ring-opening polymerization of l-lactide. Dalton Trans 2012; 41:3659-67. [DOI: 10.1039/c2dt12063a] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Huang WY, Chuang SJ, Chunag NT, Hsiao CS, Datta A, Chen SJ, Hu CH, Huang JH, Lee TY, Lin CH. Aluminium complexes containing bidentate and symmetrical tridentate pincer type pyrrolyl ligands: synthesis, reactions and ring opening polymerization. Dalton Trans 2011; 40:7423-33. [DOI: 10.1039/c1dt10442j] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Li T, Jenter J, Roesky P. New Development in Rare Earth Metal Complexes Containing Anionic Bis(imino)pyrrolyl and Bis(phosphanyl)amide Ligands. Z Anorg Allg Chem 2010. [DOI: 10.1002/zaac.201000169] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Sutar AK, Maharana T, Dutta S, Chen CT, Lin CC. Ring-opening polymerization by lithium catalysts: an overview. Chem Soc Rev 2010; 39:1724-46. [PMID: 20411192 DOI: 10.1039/b912806a] [Citation(s) in RCA: 185] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This critical review summarizes recent developments in the preparation and application of lithium catalysts/initiators such as, alkyl lithium, alkoxy lithium and bimetallic lithium compounds for ring-opening polymerization (ROP). The ROP of cyclic esters, cyclic carbonates, cyclo-silazanes, cyclo-silanes, cyclo-siloxanes, cyclo-carboxylate, cyclic phosphirene and quinodimethanes are covered in this review. The present paper emphasizes the polymerization kinetics and the control exhibited by the different types of lithium initiators/catalysts. For the cases where useful properties, such as high molecular weight, narrow PDI, or stereocontrol, have been observed, a more detailed examination of the mechanistic studies of the catalysts/initiators are provided. Furthermore, this review also focuses on the synthesis of block copolymers and graft copolymers by ROP principle. The topics covered in this review regarding lithium compounds toward ROP will be of interest to inorganic, organic and organometallic chemists, material, polymer and catalytic scientists due to its unique mode of activation as compared to transition and inner transition-metals. In addition, use of these compounds in catalysis is steadily growing, because of the complementary reactivity toward ROP as compared to other metals. Finally, some aspects and opportunities which may be of interest in the future are suggested (143 references).
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Affiliation(s)
- Alekha Kumar Sutar
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan, Republic of China
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24
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25
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Jian Z, Zhao W, Liu X, Chen X, Tang T, Cui D. Synthesis of linked half sandwich rare-earth metal chlorido and borohydrido complexes and their catalytic behavior towards MMA polymerization. Dalton Trans 2010; 39:6871-6. [DOI: 10.1039/c001824d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Jenter J, Roesky PW. Dimeric complexes of lithium and sodium forming a tetrametallacyclobuta[1,2:1,4:2,3:3,4]tetracyclopentane structure. NEW J CHEM 2010. [DOI: 10.1039/b9nj00651f] [Citation(s) in RCA: 10] [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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27
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Lien YL, Chang YC, Chuang NT, Datta A, Chen SJ, Hu CH, Huang WY, Lin CH, Huang JH. A New Type of Asymmetric Tridentate Pyrrolyl-Linked Pincer Ligand and Its Aluminum Dihydride Complexes. Inorg Chem 2009; 49:136-43. [PMID: 19950963 DOI: 10.1021/ic9016189] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Yu-Ling Lien
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 500
| | - Ya-Chi Chang
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 500
| | - Nien-Tsu Chuang
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 500
| | - Amitabha Datta
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 500
| | - Shau-Jiun Chen
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 500
| | - Ching-Han Hu
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 500
| | - Wen-Yen Huang
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 500
| | - Chia-Her Lin
- Department of Chemistry, Chung-Yuan Christian University, Chung-Li, Tau Yan, Taiwan
| | - Jui-Hsien Huang
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 500
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28
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Ho SM, Hsiao CS, Datta A, Hung CH, Chang LC, Lee TY, Huang JH. Monomeric, Dimeric, and Trimeric Calcium Compounds Containing Substituted Pyrrolyl and Ketiminate Ligands: Synthesis and Structural Characterization. Inorg Chem 2009; 48:8004-11. [DOI: 10.1021/ic900265c] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shih-Mao Ho
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 50058
| | - Ching-Sheng Hsiao
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 50058
| | - Amitabha Datta
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 50058
| | - Chen-Hsiung Hung
- Institute of Chemistry, Academia Sinica, 128 Academia Rd. Sec. 2, Nankang Taipei 115, Taiwan
| | - Ling-Chueh Chang
- Department of Applied Chemistry, National University of Kaohsiung, 811 Taiwan
| | - Ting-Yu Lee
- Department of Applied Chemistry, National University of Kaohsiung, 811 Taiwan
| | - Jui-Hsien Huang
- Department of Chemistry, National Changhua University of Education, Changhua, Taiwan 50058
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29
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Liu B, Liu X, Cui D, Liu L. Reactivity of Rare-Earth Metal Complexes Stabilized by an Anilido-Phosphinimine Ligand. Organometallics 2009. [DOI: 10.1021/om801004r] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bo Liu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China, Graduate School of the Chinese Academy of Sciences, Beijing 100039, People’s Republic of China, and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, People’s Republic of China
| | - Xinli Liu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China, Graduate School of the Chinese Academy of Sciences, Beijing 100039, People’s Republic of China, and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, People’s Republic of China
| | - Dongmei Cui
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China, Graduate School of the Chinese Academy of Sciences, Beijing 100039, People’s Republic of China, and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, People’s Republic of China
| | - Li Liu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China, Graduate School of the Chinese Academy of Sciences, Beijing 100039, People’s Republic of China, and Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, People’s Republic of China
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30
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Hamada A, Braunstein P. Lithium−Palladium Complex Supported by Phosphonatophosphine and Chloride Ligands. Inorg Chem 2008; 47:3934-6. [DOI: 10.1021/ic800355m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adel Hamada
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université Louis Pasteur, 4 rue Blaise Pascal, F-67070 Strasbourg Cédex, France
| | - Pierre Braunstein
- Laboratoire de Chimie de Coordination, Institut de Chimie (UMR 7177 CNRS), Université Louis Pasteur, 4 rue Blaise Pascal, F-67070 Strasbourg Cédex, France
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31
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Gao W, Cui D. Highly cis-1,4 selective polymerization of dienes with homogeneous Ziegler-Natta catalysts based on NCN-pincer rare earth metal dichloride precursors. J Am Chem Soc 2008; 130:4984-91. [PMID: 18338895 DOI: 10.1021/ja711146t] [Citation(s) in RCA: 209] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first aryldiimine NCN-pincer ligated rare earth metal dichlorides (2,6-(2,6-C6H3R2N=CH)2-C6H3)LnCl2(THF)2 (Ln = Y, R = Me (1), Et (2), iPr (3); R = Et, Ln = La (4), Nd (5), Gd (6), Sm (7), Eu (8), Tb (9), Dy (10), Ho (11), Yb (12), Lu (13)) were successfully synthesized via transmetalation between 2,6-(2,6-C6H3-R2N=CH)2-C6H3Li and LnCl3(THF)(1-3.5). These complexes are isostructural monomers with two coordinating THF molecules, where the pincer ligand coordinates to the central metal ion in a kappaC:kappaN:kappaN' tridentate mode, adopting a meridional geometry. Complexes 1-6, 9-11, and 13 combined with aluminum tris(alkyl)s and [Ph3C][B(C6F5)4] established a homogeneous Ziegler-Natta catalyst system, which exhibited high activities and excellent cis-1,4 selectivities for the polymerizations of butadiene (T(p) = 25 degrees C, 99.9%; 0 degrees C, 100%) and isoprene (T(p) = 25 degrees C, 98.8%). Remarkably, such high cis-1,4 selectivity almost remained at elevated polymerization temperatures up to 80 degrees C and did not vary with the type of the central lanthanide element, however, which was influenced obviously by the ortho substituent of the N-aryl ring of the ligands and the bulkiness of the aluminum alkyls. The Ln-Al bimetallic cations were considered as the active species. These results shed new light on improving the catalytic performance of the conventional Ziegler-Natta catalysts for the specific selective polymerization of dienes.
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Affiliation(s)
- Wei Gao
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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32
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Yao W, Mu Y, Gao A, Gao W, Ye L. Bimetallic anilido-aldimine Al or Zn complexes for efficient ring-opening polymerization of ε-caprolactone. Dalton Trans 2008:3199-206. [DOI: 10.1039/b719017d] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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