Synthesis and Crystal Structure of Tris(4-nitrophenyl isocyanide)bis(diethyl phenylphosphonite)cobalt(I) Perchlorate

The syntheses of five-coordinate cobalt(I) complexes of the type [Co(4-NO2C6H4NC)5-x(PhP(OEt)2)x]ClO4 (x = 2 or 3) obtained by reaction at room temperature of 4-nitrophenyl isocyanide with cobalt(II) chloride and diethyl phenylphosphonite is reported. The compounds were characterized on the basis of their chemical and physical properties (conductivities and infrared, electronic, and 1H NMR spectra). The crystal and molecular structure of tris(4-nitrophenyl isocyanide)bis(diethyl phenylphosphonite)cobalt(I) perchlorate, [Co(4-NO2C6H4NC)3(PhP(OEt)2)2]ClO4, has been determined by single-crystal x-ray analysis and refined, with full-matrix least squares using anisotropic temperature parameters for all atoms, to R = 0.072 on F2. The crystals are monoclinic, space group P21/c (C2h5), with a = 13.085 (5) Å, b = 10.826 (4) Å, c = 33.019 (8) Å, β = 91.92 (3)°, and Z = 4. The coordinated polyhedron around the cobalt atom has the shape of a slightly distorted trigonal bipyramid with isocyanide ligands in the equatorial positions. The average Co-C and Co-P distances (1.80 and 2.175 Å, respectively) clearly indicate strong double-bond character. Distortions around the phosphorus atoms are compared with those found in Ni(II) and Fe(II) complexes with the same phosphonite ligand and correlated to the M-P ir interaction. © 1976, American Chemical Society. All rights reserved

Trinitrato-(O,O')(triethylene glycol)europium(III), Eu(NO3)3 (C6H14O4).

The title compd. is monoclinic, space group P21/c, with a 12.342(5), b 9.305(4), c 14.201(5) \uc5, and \u3b2 110.88(5)\ub0; dm = 2.12(1) and dc = 2.13 for Z = 4. The final R = 3.16% for 2286 reflections. The Eu is 10-coordinated, being directly bonded to the O atoms of the glycol and of 3 bidentate NO3. The glycol mol. forms a ring-like structure around the metal together with a NO3 ion; 2 other NO3 are axial above and below the ring plane. Eu-O bond distances are 2.433(4)-2.508(4) \uc5 for the glycol and 2.488(5)-2.522(5) \uc5 for the NO3 atoms. At. coordinates are given. = 1 5 2 4 ( l ) A r . Z=4. D - ( f l o t a t i o n ) - 2 . t 2 i l ) , . ' , =2 l 3 M c m - r , M o K u , 1 : 0 . 7 t 0 6 9 4 " u : 4.55 mn-', F(om)- 952, rmm temFrarure. \uc0 = 3.16% \ucdor 2286 obsened .enections. The Eu atom \uecs @n-c6rdinated being diredly bonded to rhe oxygen aroms of the gly@l Md of thrce bidetrtate nitrates. The glycol molecule forms a ringlike strucrure around rhe metd together with a nitrate iooi go orher nitrates are uial above \uf9d below lhe ring plee. Eu-O bond dstances are in rhe range 2.433 (4F2.508 (4) A for rhe s.ly@l md 2.488 (5F2.522 (5) A for rh\u20ac ntraro oxyg\u20acn abms

The crystal and molecular structure of trans-bis(triphenylphosphine)dicarbonyl(1,3-diphenylformamidino)rhenium(I)

The title complex crystd. in monoclinic space group P21/n, with a 21.13(1), b 14.47(1), c 13.25(1) Å, and 97.58(4)°; d. = 1.44 for Z = 4. The structure was refined to R = 0.056. At. parameters are given. The coordination about the Re atom is approx. octahedral. The formamidino ligand is coordinated to the metal atom in a bidentate mode with a N(1)-Re-N(2) angle of 60(1) and a N(1)-C(53)-N(2) angle of 112(1). The Re-N(1) and Re-N(2) bond lengths are 2.22(1) and 2.22(1) Å and the N(1)-C(49) and N(2)-C(49) distances are 1.32(1) and 1.34(1) Å, resp. The entire Re-formamidino system is essentially planar, allowing a delocalization of the electron d

Sintesi e caratterizzazione di un nuovo complesso di uranio (IV): (Ph4As)2(Ph_4As)_2 [U(PDC)3] . 3H2O[U(PDC)_3] \ ^. \ 3H_2O ( H2PDCH_2PDC = acido piridin-2,6-dicarbossilico)

The preparation of $(Ph_4As)_2[U(PDC)_3] \ ^. \ 3H_20$, obtained by interaction of pyridin-2,6-dicarboxylic acid, $UCl_4$ and $Ph_4AsCl$ in water, is reported. This complex has been characterized by a series of physico-chemical measurements including the determination of the crystal structure by X-ray analysis

Crystal structure of the complex of palladium with biacetyl-bis(N-methyl,N-phenyl)osazone

In the title compound, the biacetyl bis-(N-methyl,N-phenyl)osazone acts as a tridentate ligand, the nitrogen atoms bonding via the lone pairs