159983-99-0Relevant academic research and scientific papers
Coordination properties of silver diphosphine complexes. Crystal and molecular structures of Ag2X2(m-PP)2 (X = I, Cl, NO3; m-PP = 1,3-bis[(diphenylphosphino)methyl]benzene) and Ag2X2(o-PP)2 (X = I, Cl; o-PP = 1,2-bis[(diphenylphosphino)methyl]benzene). Synthesis and 1H- and 31P-NMR spectroscopy
Caruso, Francesco,Camalli, Mercedes,Rimml, Heinrich,Venanzi, Luigi M.
, p. 673 - 679 (2008/10/08)
The synthesis and 1H- and 31P-NMR spectra of silver halides and silver nitrate complexes of the ligands 1,3-bis[(diphenylphosphino)methyl]benzene (m-PP) and 1,2-bis[(diphenylphosphino)methyl]benzene (o-PP) are reported. The crystal and molecular structures of Ag2X2(m-PP)2 (X = I, Cl, NO3) and Ag2X2(o-PP)2 (X = I, Cl) show that these complexes are binuclear with a rhomboid core consisting of two metals and two anionic ligands. The metal is tetrahedrally surrounded by the two bridging anions and two P atoms. For m-PP complexes, each Ag atom is bound to P atoms of different phosphines which also act as bridging ligands. On the other hand, the o-PP ligand coordinates in a chelate fashion. This difference in behavior is related to the length of the chain between the phosphine donors, which determines whether chelation can occur in complexes of composition AgX-(o-PP). The bond angle P-Ag-P, ranging from 110 to 138°, is related to the nucleophilicity of the anions. In the m-PP complexes, the shape of the rhomboid core is strongly influenced by the van der Waals interactions of the core atoms. Crystal data are as follows: Ag2I2(m-PP)2, monoclinic, P21/c, Z = 4, a = 12.082(4) A?, b = 22.536(9) A?, c = 22.438(5) A?, β = 104.22(2)°; Ag2Cl2(m-PP)2, triclinic, P1, Z = 2, a = 12.307(3) A?, b = 12.704(3) A?, c = 19.673(5) A?, α = 90.02(2)°, β = 104.55(2)°, γ = 96.97(2)°; Ag2(NO3)2(m-PP)2, triclinic, P1, Z = 2, a = 12.303(6) A?, b = 12.953(9) A?, c = 19.572(8) A?, α = 88.89(5)°, β = 74.13(3)°, γ = 80.95(5)°; Ag2I2(o-PP)2, monoclinic, P21/a, Z = 2, a = 14.542(2) A?, b = 16.828(3) A?, c = 12.857(2) A?, β = 70.71(1)°; Ag2Cl2(o-PP)2, monoclinic, P21/a, Z =2, a = 14.046(4) A?, b = 16.882(3) A?, c = 12.845(5) A?, β = 68.63(3)°.
