Benzamidinatorhodium complexes. X-Ray structures of [Rh{CPh(NPh)₂}(cod)] and [Rh₂{µ-CPh(NPh)₂}₂(tfbb)₂]

Facile Synthesis of Phosphaamidines and Phosphaamidinates using Nitrilium Ions as an Imine Synthon

“…The molecular structure of 8 shows a k 2 -phosphaamidinate complex [Rh1-P1 2.3513(6), Rh1-N1 2.085(2) ] bearing a h 4 -coordinated cod fragment and features a shortened P À C bond [P1-C1 1.820(2) ], an elongated N=C bond [N1-C1 1.309(3) ], and a P1-Rh1-N1 angle of 67.41(5)8 (Scheme 4). This bite angle is larger than that for the corresponding amidinate ligands (638) [35] because of the larger size of the P atom, which will have an effect on its reactivity, [36] and is currently under investigation. Finally, we explored whether the nitrilium ion methodology would allow extending the 1,3-P,N ligand with a second imine unit to potentially give 1,3,5-N,P,N ligands.…”

Chemistry and Biological Activity of Platinum Amidine Complexes

“…[5] The second route involves reaction of lithium or potassium formamidinates with anionic complexes [6] such as NEt 4 [M(CO) 5 Cl], or partial substitution of ancillary ligands (i.e., dienes, Cl) by RN(H)=C(R')=NR in the presence of a base, giving rise to dinuclear complexes. [7][8][9][10][11][12] Bridging N,N'-dimethylbenzamidinate (DMBA) moieties have been used to generate [Ru-(DMBA) 4 ] species as precursors of oligomeric compounds, the electronic properties of which have been investigated as electronic wires. [13,14] Flexible formamidinato ligands have been used as unique tools to study monodentate, bridging, and chelating arrangements in platinum derivatives, depending on the reaction conditions and the electronic properties determined by the nature of the substituents on the nitrogen and methine carbon atoms (Scheme 1).…”

Structure of a RhI complex of a bis(2,3-quinolino)-annulated cis,syn,cis-tricyclo[6.3.0.03,7]undecane

“…for similar complexes (Tiripicchio, Camellini, Uson, Oro, Ciriano & Viguri, 1984;Oro, Ciriano, Villarroya, Tiripicchio & Lahoz, 1984;Lahoz, Tiripicchio, Camellini, Oro & Pinillos, 1985). The central five-membered ring of ligand (1) The bite angle N-Rh-N ofligand (1) in the complex is 81.9 (2) ° with the lone pairs pointing almost directly toward the Rh t ion [C(5)-N-Rh = 175.1 (2)°1.…”

“…Many potentially binucleating ligands such as 1,8-naphthyridine (Tiripicchio, Camellini, Uson, Oro, Ciriano & Viguri, 1984), 7-azaindole (Oro, Ciriano, Villarroya, Tiripicchio & Lahoz, 1984) and pyrazole and its derivatives (Uson, Oro, Ciriano, Carmona, Tiripicchio & Camellini, 1982) form complexes in which the ligand bridges binuclear Rh 2 units. In the case of amidinato complexes of Rh I with cod (1,5-cyclooctadiene), tfbb (tetrafluorobenzo15,61bicyclo12.2.21-octa-2,5,7-triene) and nbd (norbornadiene) both mononuclear and binuclear Rh t complexes can be prepared depending upon the nature of the two ligands and upon the resulting steric interactions (Lahoz, Tiripicchio, Camellini, Oro & Pinillos, 1985). In some cases monomer-dimer equilibria have been observed by NMR techniques (Knoth, 1973).…”