Abstract:The dispersion polymerization of methylmethacrylate stabilized by poly(12-hydroxy-stearic acid) in hydrocarbon media has been investigated. Unlike earlier results [7] it was found that stable latex particles can be prepared in the initial monomer concentration range 8.5 % to 34 %'. To obtain stable particles varying amounts of stabilizer were used.
From the reaction of m-(Me2NCH2)2C6H4 with aqueous rhodium trichloride in ethanol the ortho-metalated product trans-Rhn,Cl2(N-C-N)(H20) could be isolated in 45% yield (N-C-N = C6H3(CH2NMe2)2-o,oO. Its solid-state structure was determined by an X-ray diffraction study. Crystals are monoclinic, space group P7\jn, with lattice parameters a = 9.070 (1) Á, b = 17.277 (3) Á, c = 9.855 (1) Á, ß = 91.34 (1)°, V = 1543.9 (4) Á3, Z = 4, and ¿(caled) = 1.648 g cm"3. Refinement with 3710 observed reflections converged at R = 0.042. The structure of imni-RhnlCl2(N-C-N)(H20) consists of a rhodium(III) center that is octahedrally coordinated. A mer arrangement of the C and two N atoms of the monoanionic N-C-N ligand (Rh-C(aryl) = 1. 913 (3) Á) and a coordinated water molecule trans to C(aryl) form a planar arrangement. The two mutually trans Cl atoms sited above and below this plane complete the coordination sphere. In the solid state the molecules form infinite chains via intermolecular O-H-Cl hydrogen bonds. Metathesis of this new compound with either a large excess of alkali-metal salt or a slight excess of silver salt led to the formation of a range of new arylrhodium(III) compounds, rranr-RhX2(N-C-N)(H20) (X = Br, 02CH, 02CMe, N03, and CN). Halogen-bridged biand trinuclear complexes RhCl(N-C-N)^-Cl)2M(COD) (M = Rh1, Ir1; COD = 1,5cyclooctadiene) and [RhCl(N-C-N)(^-Cl)2]2M (M = Pd", Cu") were synthesized by mixing fra«y-RhCl2(N-C-N)(H20) with the appropriate metal salt: [MCl(COD)]2, CuCI2, and PdCl2(COD) or Li2PdCl4, respectively.' The same reaction with Li(acac)
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