The crystal and molecular structure of iminodiacetic acid hydroiodide, C 4 H 7 NO 4 .HI

The crystal structure of bis(iminodiacetato)dioxouranium(VI) has been determined by Fourier methods and refined by least-squares calculations to R=0.038. The unit cell is triclinic P]" with a=8-970 (3), b=6.367 (2), c=5-843 (2)~, 0c=92.42 (4), ,8=76.38 (4), y=104.15 (4) °, Z=I. The iminodiacetate ligands are bridging the uranyl groups in infinite chains running in the [0]1] direction, cross-linked through hydrogen bonds. The carboxylate groups are both ionized and the proton is linked to the nitrogen atom. One carboxylate group of each ligand acts as monodentate, the other as bidentate on two adjacent uranium atoms. The geometry around the uranium is approximately hexagonal bipyramidal.

Section: Description Of the Structuresupporting

confidence: 82%

Section: Description Of the Structurementioning

confidence: 61%

Structural studies on the actinide carboxylates. II. The crystal and molecular structure of bis(iminodiacetato)dioxouranium(VI)

Bombieri¹,

Forsellini²,

Tomat³

et al. 1974

“…HX, where X = C1, Br or I, have been reported (Oskarsson, 1973(Oskarsson, , 1974. HX, where X = C1, Br or I, have been reported (Oskarsson, 1973(Oskarsson, , 1974.…”

Section: Introductionmentioning

confidence: 99%

The crystal and molecular structure of iminodiacetic acid hydrofluoride monohydrate, C₄H₇NO₄.HF.H₂O, at –100°C

Oskarsson¹

1974

Self Cite

The crystal and molecular structure of iminodiacetic acid hydrofluoride monohydrate, C4H7NO4.HF.HzO, has been determined from X-ray intensities collected at -100°C with a fourcircle single-crystal diffractometer. The space group is P21/c with Z= 4, and the unit-cell dimensions are a= 11-8784 (29), b= 6-4045 (9), c-10-0568 (22)/~, fl= 110"65 (2) °. The structure has been refined to R = 0.038. Positively charged iminodiacetic acid ions are connected by hydrogen bonds, via the fluoride ions and the water molecules, forming layers that are stacked in the c direction. The forces between the layers are of van der Waals type.

“…The deviation from spherical electron density distribution is thus compensated by a shift of H towards the O atom in the least-squares procedure. It is interesting to note that in the compounds C4HaNO4X this shift increases in the series F<CI<Br<I (Oskarsson, 1973(Oskarsson, , 1974a. No such effect is observed in the N-H bond.…”

Section: Table 4 Selected Interatomic Distances (A) and Angles (O) Wmentioning

confidence: 92%

“…In a systematic study of the geometry of the positively charged iminodiacetic acid ion, [CaHsNO4] +, the structures of the addition compounds of iminodiacetic acid with the hydrogen halides have been determined from X-ray intensities (Oskarsson, 1973(Oskarsson, , 1974a. They contain chains of positively charged iminodiacetic acid ions and halide ions, linked by hydrogen bonds into layers.…”

Section: Introductionmentioning

confidence: 99%

Combined X-ray and neutron diffraction studies of normal and deuterated iminodiacetic acid hydrobromide

Oskarsson¹

1976

The structures of C4HsNO4Br and C4H4D4NO4Br have been investigated at room temperature by X-ray (2= 1.5418 A) and neutron diffraction (2= 1.210 A). The compounds are isostructural, crystallizing in the space group Pmmn with Z=2 and a= 12.8150, b= 5.8707, c= 5.0870 A and a= 12.8047, b= 5.8670, c = 5.0807 A, respectively. Positively charged iminodiacetic acid ions are connected by hydrogen bonds O-H...Br and N-H...Br forming layers that are stacked in the e direction. The forces between the layers are van der Waals. (X-N) difference syntheses have been calculated for the normal compound to illustrate the electron density within the organic ion and in the hydrogen bonds.