ARYLDIAZENE, ARYLDIAZENIDO, AND HYDRAZINE COMPLEXES OF MANGANESE - PREPARATION, CHARACTERIZATION, AND X-RAY CRYSTAL-STRUCTURES OF [MN(CO)(3)(4-CH3C6H4N=NH)(PPH(OET)(2))(2)]BF4 AND [MN(CO)(3)(NH2NH2)(PPH(OET)(2))(2)]BPH4 DERIVATIVES
G. Albertin et al., ARYLDIAZENE, ARYLDIAZENIDO, AND HYDRAZINE COMPLEXES OF MANGANESE - PREPARATION, CHARACTERIZATION, AND X-RAY CRYSTAL-STRUCTURES OF [MN(CO)(3)(4-CH3C6H4N=NH)(PPH(OET)(2))(2)]BF4 AND [MN(CO)(3)(NH2NH2)(PPH(OET)(2))(2)]BPH4 DERIVATIVES, Inorganic chemistry, 36(7), 1997, pp. 1296-1305
Aryldiazene complexes [Mn(CO)(3)(ArN=NH)P-2]BF4 (1, 2) and [{Mn(CO)(3)
P-2}(2)(mu-HN=NArArN=NH)](BF4)(2) (3, 4) [P = PPh(OEt)(2), PPh(2)OEt;
Ar = C6H5, 2-CH3C6H4, 4-CH3C6H4, 4-CH3OC6H4; ArAr = 4,4'-C6H4C6H4, 4,4
'-(2-CH3)C6H3C6H3(2-CH3), 4,4'-C6H6CH2C6H4] were prepared by reacting
hydride species MnH(CO)(3)P-2 with the appropriate aryldiazonium catio
ns in CH2Cl2 or acetone solutions at -80 degrees C. The compounds were
characterized by IR, H-1 and P-31 NMR spectra (with N-15 isotopic sub
stitution), and a single-crystal X-ray structure determination. The co
mplex [Mn(CO)(3)(4-CH3C6H4N=NH) {PPh(OEt)(2)}(2)]BF4 (1c) crystallizes
in the space group C2/c with a 31.857(5) Angstrom, b = 11.119(2) Angs
trom, c = 22.414(3) Angstrom, beta = 97.82(1)degrees, and Z = 8. Treat
ment of aryldiazene compounds 1-4 with NEt(3) gave the pentacoordinate
aryldiazenido [Mn(CO)(2)(ArN2)P-2] (5, 6) and [{Mn(CO)(2)P-2}(2)(mu-N
-2-ArArN2)] (7, 8) [P = PPh(OEt)(2), PPh(2)OEt; Ar = C6H5, 4-CH3C6H4;
ArAr = 4,4'-C6H4C6H4, 4,4'-(2-CH3)C6H3C6H3(2-CH3)] derivatives. Proton
ation reactions of these aryldiazenido complexes 5-8 with HCl afforded
the aryldiazene [MnCl(CO)(2)(ArN=NH)P-2] (9) and [{MnCl(CO)(2)P-2}(2)
(mu-HN=NArArN=NH)] (10) derivatives. Hydrazine complexes [Mn(CO)(3)(RN
HNH(2))P-2]BPh(4) (11, 12) [P = PPh(OEt)(2), PPh(2)OEt; R = H, CH3, C6
H5, 4-NO2C6H4] were prepared by allowing hydride species MnH(CO)(3)P-2
to react first with triflic acid and then with the appropriate hydraz
ine. Their characterization by IR, H-1 and P-31 NMR spectra, and an X-
ray crystal structure determination is reported. The compound [Mn(CO)(
3)(NH2NH2){PPh(OEt)(2)}(2)]BPh(4) (11a) crystallizes in the space grou
p P (1) over bar with a = 13.772(3) Angstrom, b = 14.951(4) Angstrom,
c = 13.319(3) Angstrom, alpha = 104.47(1)degrees, beta = 100.32(1)degr
ees, gamma = 111.08(1)degrees, and Z = 2. Oxidation reactions of hydra
zine compounds 11 and 12 with Pb(OAc)(4) at -40 degrees C gave stable
aryldiazene [Mn(CO)(3)(RN=NH)P-2]BPh(4) and thermally unstable (upon r
eaching -40 degrees C) diazene [Mn(CO)(3)(HN=NH)P-2]BPh(4) derivatives
.