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DOE OSTI2020

Materials Data on Ti(NF2)3 by Materials Project

TiNF6N2 crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of eight ammonia molecules and one TiNF6 framework. In the TiNF6 framework, Ti3+ is bonded to six equivalent F1- atoms to form TiF6 octahedra that share corners with six equivalent NF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All Ti–F bond lengths are 1.91 Å. N1+ is bonded to six equivalent F1- atoms to form NF6 octahedra that share corners with six equivalent TiF6 octahedra. The corner-sharing octahedral tilt angles are 0°. All N–F bond lengths are 2.08 Å. F1- is bonded in a distorted linear geometry to one Ti3+ and one N1+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Th(NF2)4 by Materials Project

ThF4(NF)4 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of eight monofluoroamine molecules and one ThF4 ribbon oriented in the (1, 0, 0) direction. In the ThF4 ribbon, Th4+ is bonded in a 6-coordinate geometry to six F1- atoms. There are a spread of Th–F bond distances ranging from 2.11–2.40 Å. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Th4+ atom. In the second F1- site, F1- is bonded in a bent 120 degrees geometry to two equivalent Th4+ atoms. In the third F1- site, F1- is bonded in a single-bond geometry to one Th4+ atom. In the fourth F1- site, F1- is bonded in a water-like geometry to two equivalent Th4+ atoms.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Sc(NF2)3 by Materials Project

(ScF3)2N2(NF)4F2 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of one ammonia molecule, one hydrofluoric acid molecule, two monofluoroamine molecules, and one scandium fluoride molecule.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Ni(NF2)2 by Materials Project

NiF4N2 is (La,Ba)CuO4 structured and crystallizes in the tetragonal I4/mmm space group. The structure is two-dimensional and consists of four ammonia molecules and two NiF4 sheets oriented in the (0, 0, 1) direction. In each NiF4 sheet, Ni2+ is bonded to six F1- atoms to form corner-sharing NiF6 octahedra. The corner-sharing octahedral tilt angles are 0°. There is two shorter (1.83 Å) and four longer (1.90 Å) Ni–F bond length. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a linear geometry to two equivalent Ni2+ atoms. In the second F1- site, F1- is bonded in a single-bond geometry to one Ni2+ atom.

36 MATERIALS SCIENCE↗

NASA NTRS1995

Preservation of auditory and vestibular function after surgical removal of bilateral vestibular schwannomas in a patient with neurofibromatosis type 2

The outcome of acoustic neuroma (vestibular schwannoma) surgery continues to improve rapidly. Advances can be attributed to several fields, but the most important contributions have arisen from the identification of the genes responsible for the dominant inheritance of neurofibromatosis types 1 (NF1) and 2 (NF2) and the development of magnetic resonance imaging with gadolinium enhancement for the early anatomic confirmation of the pathognomonic, bilateral vestibular schwannomas in NF2. These advances enable early diagnosis and treatment when the tumors are small in virtually all subjects at risk for NF2. The authors suggest that advising young NF2 patients to wait until complications develop, especially hearing loss, before diagnosing and operating for bilateral eighth nerve schwannomas may not always be in the best interest of the patient. To the authors' knowledge, this is the first reported case of preservation of both auditory and vestibular function in a patient after bilateral vestibular schwannoma excision.

Case Reports↗

DOE OSTI2020

Materials Data on MnN2F5 by Materials Project

(MnF3)2N2(NF2)2 crystallizes in the orthorhombic Pnma space group. The structure is one-dimensional and consists of four ammonia molecules; four difluoroamine molecules; and two MnF3 ribbons oriented in the (0, 1, 0) direction. In each MnF3 ribbon, Mn3+ is bonded in a distorted square co-planar geometry to four F1- atoms. There is two shorter (1.80 Å) and two longer (1.93 Å) Mn–F bond length. There are two inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Mn3+ atom. In the second F1- site, F1- is bonded in a bent 150 degrees geometry to two equivalent Mn3+ atoms.

36 MATERIALS SCIENCE↗