Reactions of Molybdate(VI) with Hydroxylamine and N‐Methylhydroxylamine

Abstract

Two remarkable molybdenum complexes have been isolated on recation of aqueous solutions of MoVI oxo anions with H2NOH or MeHNOH: the yellow NO complex (1) and the colorless NO‐free neutral complex (2). This shows that many yellow Mo complexes characterized only in solution pribably contain NO ligands.

Structure of tetraphenylphosphonium (bipyridine)tetrachloromolybdate(III) [PPh4][MoCl4(bpy)]

“…1. Atomic coordinates and some relevant bond distances and angles are listed in Tables 1 and 2 The Mo-N distances 2.156 (3) and 2.169 (2) A are in the range observed for other molybdenum complexes, such as [Mo(H2NO)2(NO)(bpy)], (Mo-N)av = 2.189 A (Weighardt, Holzback, Weiss, Nuker & Prikner, 1979) and [Mo(OPri)2(bpy)2], (Mo-N)av= 2.118A (Chisholm, Huffman, Rothwell, Bradley, Kress & Woodruff, 1981). The bipyridine ligand parameters in [MoC14(bpy)]-do not vary significantly from those in the free ligand, which contains transnitrogen atoms.…”

Inhibition of yeast growth by molybdenum-hydroxylamido complexes correlates with their presence in media at differing pH values

“…The compound was prepared using a slight modification of an earlier preparation [17]. To a stirred, 40 mL aqueous solution of Na 2 MoO 4 AE 2H 2 O (7.20 g, 29.7 mmol) at 40°C, was added solid MeHNOH AE HCl (5.22 g, 62.5 mmol).…”

“…The slightly off-white [MoO 2 (Et 2 -NO) 2 ] (3) 2 was prepared as described previously [18]. The synthetic procedure was simplified as described below for the preparation of [MoO 2 (MeHNO) 2 ] (1) [17] and [MoO 2 (Me 2 NO) 2 ] (2) [18] [31] complexes were prepared as previously reported and their characterization was found to be satisfactory.…”

“…Mo complexes with hydroxylamido ligands were chosen for these studies, in part because of the known chemistry of representative simple complexes [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], and in part because of their anticipated analogy with their corresponding vanadium-hydroxylamido complexes [16,19,[23][24][25]. The most common bonding modes for hydroxylamines are the end-on and the bidentate modes.…”

“…The most common bonding modes for hydroxylamines are the end-on and the bidentate modes. The simple mono-and dialkylhydroxylamido Mo complexes [MoO 2 (MeHNO) 2 ] (1), [MoO 2 (Me 2 NO) 2 ] (2) and [MoO 2 (Et 2 NO) 2 ] (3) have the MoO 2 unit coordinated to two bidentate hydroxylamido ligands to give a distorted six-coordinate geometry [16,17]. The structure of these complexes is similar to that of the simple peroxo derivatives, which tend to be six-coordinate mononuclear or seven-coordinate dinuclear complexes [26].…”