New volatile heteroleptic complex of copper(II): Comparison of two polymorphs

Polyhedron ◽  
2013 ◽  
Vol 49 (1) ◽  
pp. 1-6 ◽  
Author(s):  
V.V. Krisyuk ◽  
I.A. Baidina ◽  
I.V. Korolkov ◽  
P.P. Semyannikov ◽  
P.A. Stabnikov ◽  
...  
Keyword(s):  
Heteroleptic Complex

scholarly journals Rhodium-catalyzed asymmetric hydrogenation using self-assembled chiral bidentate ligands

2006 ◽  
Vol 78 (2) ◽  
pp. 501-509 ◽  
Author(s):  
James M. Takacs ◽  
Kittichai Chaiseeda ◽  
Shin A. Moteki ◽  
D. Sahadeva Reddy ◽  
Di Wu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Metal Forming ◽  
Asymmetric Hydrogenation ◽  
Catalyst System ◽  
Asymmetric Induction ◽  
Bidentate Ligands ◽  
Catalytic Metal ◽  
Preliminary Study ◽  
Self Assembled ◽  
Heteroleptic Complex

The chirality-directed self-assembly of bifunctional subunits around a structural metal - typically, zinc(II) - is used to form a heteroleptic complex in which a second set of ligating groups are suitably disposed to bind a second metal, forming a heterobimetallic catalyst system. We find that subtle changes in the structural backbone (i.e., ligand scaffold) of such chiral bidentate self-assembled ligands (SALs) can be used to manipulate the ligand topography and chiral environment around catalytic metal; thus, the scaffold can be optimized to maximize asymmetric induction. Using this combinatorial strategy for ligand synthesis, a preliminary study was carried out in which a library of 110 SALs was evaluated in the rhodium-catalyzed asymmetric hydrogenation of a simple N-acyl enamide. The level of enantioselectivity obtained varies from near racemic to greater than 80 % ee as a function of the ligand scaffold, with the possibility of further improvement yet to be explored.

(Tnmethylphosphine)(triphenylsilyl)gold(I) and Related Compounds

1999 ◽  
Vol 54 (1) ◽  
pp. 26-29 ◽  
Author(s):  
Miguel Monge Oroz ◽  
Annette Schier ◽  
Hubert Schmidbaur
Keyword(s):  
Crystal Structure ◽  
Crystal Lattice ◽  
Coordination Compounds ◽  
Ionic Species ◽  
X Ray Diffraction ◽  
X Ray ◽  
Halide Complexes ◽  
Related Compounds ◽  
Heteroleptic Complex

Mononuclear coordination compounds of the type (R3P)AuSiR′3 with R = R’ = Ph and R = Me, R′ = Ph have been obtained from reactions of the corresponding halide complexes (R3P)AuCl with the silyllithium reagent LiSiPh3. The fully phenylated species undergoes ligand redistribution in solution to give homoleptic ionic species. (Me3P)AuSiPh3 is less susceptible to this process and crystallizes from solutions as the heteroleptic complex. The crystal structure of this compound has been determined by X-ray diffraction. In the crystal lattice the molecules are not associated.

Aluminium(III) amidinates formed from reactions of `AlCl' with lithium amidinates

2013 ◽  
Vol 69 (10) ◽  
pp. 1120-1123 ◽  
Author(s):  
Dennis H. Mayo ◽  
Yang Peng ◽  
Peter Zavalij ◽  
Kit H. Bowen ◽  
Bryan W. Eichhorn
Keyword(s):  
Molecular Structure ◽  
Rotation Axis ◽  
Asymmetric Unit ◽  
Homoleptic Complex ◽  
Independent Molecules ◽  
Cl Atoms ◽  
Heteroleptic Complex

The disproportionation of AlCl(THF)n(THF is tetrahydrofuran) in the presence of lithium amidinate species gives aluminium(III) amidinate complexes with partial or full chloride substitution. Three aluminium amidinate complexes formed during the reaction between aluminium monochloride and lithium amidinates are presented. The homoleptic complex tris(N,N′-diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)3] or Al{PhC[N(i-Pr)]2}3, (I), crystallizes from the same solution as the heteroleptic complex chloridobis(N,N′-diisopropylbenzimidamido)aluminium(III), [Al(C13H19N2)2Cl] or Al{PhC[N(i-Pr)]2}2Cl, (II). Both have two crystallographically independent molecules per asymmetric unit (Z′ = 2) and (I) shows disorder in four of its N(i-Pr) groups. Changing the ligand substituent to the bulkier cyclohexyl allows the isolation of the partial THF solvate chloridobis(N,N′-dicyclohexylbenzimidamido)aluminium(III) tetrahydrofuran 0.675-solvate, [Al(C19H27N2)2Cl]·0.675C4H8O or Al[PhC(NCy)2]2Cl·0.675THF, (III). Despite having a twofold rotation axis running through its Al and Cl atoms, (III) has a similar molecular structure to that of (II).

scholarly journals Synthesis, solid-state structures and reduction reactions of heteroleptic Ge(II) and Sn(II) β-ketoiminate complexes

2017 ◽  
Vol 72 (11) ◽  
pp. 813-820 ◽  
Author(s):  
Jessica Wiederkehr ◽  
Christoph Wölper ◽  
Stephan Schulz
Keyword(s):  
General Type ◽  
Heteronuclear Nmr ◽  
X Ray Diffraction ◽  
Group 14 ◽  
Subsequent Formation ◽  
X Ray ◽  
Tin Complexes ◽  
Ligand Transfer ◽  
Solid State Structures ◽  
Heteroleptic Complex

AbstractA series of new heteroleptic divalent germaniun and tin complexes of the general type L1,4GeN(SiMe3)2 (1, 2) and L1−4SnN(SiMe3)2 (3–6) were synthesized by reaction of β-ketimines L1−4H with Ge[N(SiMe3)2]2 and Sn[N(SiMe3)2]2, respectively. The reaction of 3 with the strong Mg(I) reductant L5Mg yielded the heteroleptic complex L1MgL57 after ligand transfer from tin to magnesium, whereas analogous reactions of L4GeN(SiMe3)22 and L4SnN(SiMe3)26 with L5Mg occurred with formation of insoluble precipitates, transfer of the amido substituent from the group 14 metal to magnesium and subsequent formation of the heteroleptic magnesium complex L5MgN(SiMe3)2 (8). 1–8 were characterized by heteronuclear NMR (1H, 13C, 119Sn) and IR spectroscopy, elemental analysis and single-crystal X-ray diffraction (L4SnN(SiMe3)26, L1MgL57).

Marked Improvement in Photoinduced Cell Death by a New Tris-heteroleptic Complex with Dual Action: Singlet Oxygen Sensitization and Ligand Dissociation

2014 ◽  
Vol 136 (49) ◽  
pp. 17095-17101 ◽  
Author(s):  
Bryan A. Albani ◽  
Bruno Peña ◽  
Nicholas A. Leed ◽  
Nataly A. B. G. de Paula ◽  
Christiane Pavani ◽  
...  
Keyword(s):  
Cell Death ◽  
Singlet Oxygen ◽  
Marked Improvement ◽  
Ligand Dissociation ◽  
Dual Action ◽  
Heteroleptic Complex
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