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Mononuclear molybdenum(VI) complexes with Schiff bases differently bonded to molybdenum

Crystal data: (A) C_2_3H_2_3MoNO_6, Mr = 505.36, triclinic, a = 8.048(2), b = 10.283(2), c = 13.780(1) Å, alfa = 76.54(1), beta = 82.30(2), gama = 77.40(2), V = 1078.1(3) Å^3, Z = 2, space group , Dcalc = 1.557 g cm^-^3, F(000) = 516, lambda(MoK_alfa) = 0.648 mm^-^1, lambda(MoKalfa) = 0.7107 Å, (B) C_3_8H_3_6MoN_2O_1_6, Mr = 872.63, triclinic, a = 11.774(2), b = 13.789(2), c = 13.759(3) Å, alfa = 69.73(1), beta= 67.96(1), gama = 65.09(2), V = 1830.0(5) Å^3, Z = 2, space group , Dcalc = 1.584 g cm^-^3, F(000) = 896, lambda(MoK_alfa) = 0.439 mm^-1, lambda(MoK_alfa) = 0.7107 Å. (C) C_1_7H_1_9MoNO_6S, Mr = 461.33, monoclinic, a = 13.638(1), b = 8.500(1), c = 16.430(1) Å, beta = 105.98(3), V = 1830.8(2) Å^3, Z = 4, space group P21/a, Dcalc = 1.674 g cm^-^3, F(000) = 936, (MoK) = 0.864 mm^-^1, lambda(MoK_alfa) = 0.7107 Å, (D) C_1_7H_1_9MoNO_6, Mr = 429.27, triclinic, a = 7.070(1), b = 10.872(2), c = 11.843(2) Å, alfa = 74.39(1), beta = 87.44(1), gama= 82.87(2), V = 869.8(2) Å3, Z = 2, space group , Dcalc = 1.639 g cm-3, F(000) = 436, lambda(MoK_alfa) = 0.787 mm^-1, lčambda(MoK_alfa) = 0.7107 Å. In all complexes Mo(VI) atoms are octahedrally coordinated, with a characteristic cis-MoO2 group. However, Schiff bases are coordinated in a different way: in (A) monodentate ligand molecule is coordinated through oxygen atom from naphthaldimine part, with the additionally coordinated didentate acetylacetone ligand. In (B) two didentate ligands are coordinated through two oxygen atoms from 4-hydroxy-2-pyrone ring. In (C) and (D) tridentate ligand is coordinated through two oxygen atoms (one from salicylaldiminato part of the ligand and one from N-substituent) and imino nitrogen atom. Additionally, solvent molecules DMSO in (C) and ethanol in (D) are bonded to Mo thus satisfying its octahedral coordination.

Mononuclear molybdenum(VI) complexes; Schiff bases; Enaminones

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