Low-temperature Neutron Diffraction Study of Reh5(pphipr2)2(sihph2)2 and Low-temperature X-ray Diffraction Study of Reh5(pcyp3)2(sih2ph)2

Content Provider	Semantic Scholar
Author	Howard, Judith A. K. Keller, Peter A. Vogt, Thomas Taylor, Alicia L. Dix, Norman Spencer, John L.
Copyright Year	1992
Abstract	Crystals of bis[diisopropyl(phenyl)phosphine]bis(diphenylsilyl)pentahydridorhenium [ReHs(pPhipr2)2 (SiHPh2)2] (I) grow as transparent prisms from nhexane in the space group P1. Mr = 946.38, a = 11.879(1), b =16.754(1), c =12 .637(1)A, a 96.824(3), /3=116.169(3), y=87 .313(4 ) °, U = 2238.8 (6) ]k 3 (15 K), Z = 2, Dx = 1.41 g cm -3 (293 K), A = 1.3168 A (thermal neutrons; Ge monochromator), Iz = 2.74 cmi , F(000) = 208 × 1013 cm, R = 0.072 (3160 reflections used). Crystals of pentahydridobis(phenylsilyl)bis(tricyclopentylphosphine)rhenium [ReHs(PCyp3)E(SiHzPh)2] (II) grow from n-hexane as transparent prisms in the space group P212121. Mr = 882.38, a = 12.448 (2), b = 17.579 (4), c = 19.433 (4) A, U = 4252 (3)/k 3 (200 K~), Z = 4, Dx = 1 .36gcm -3 (293 K), A =0.71073 A (X-rays: Mo Ka; graphite monochromator), Iz = 30.2 cmi , F(000) = 1832.0, R=0.041 (6014 reflections used). For (I), the Re P bond lengths and P R e P bond angle are 2.444 (8), 2.444 (7)A and 141.2 (3) °, and the Re---Si bond lengths and Si--Re---Si bond angle are 2.500 (8), 2.510 (9) A and 117.9 (3) °. For (II), the corresponding lengths and angles are 2.439(1), 2.444 (1) A, 139.5 (1) ° and 2.501 (2), 2.490 (2) A, 97.9 (1) °. The closest intramolecular contact between hydride ligands in (I) is 2.002 (29)A, and that * Author to whom correspondence should be addressed. Present address: Department of Chemistry, University of Durham, Durham DHI 3LE, England. 0108-7681/92/040438-07506.00 between a hydride ligand and a silicon atom is 2.048 (13) A.
Starting Page	438
Ending Page	444
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1107/S0108768191014428
Volume Number	48
Alternate Webpage(s)	http://journals.iucr.org/b/issues/1992/04/00/ha0088/ha0088.pdf
Alternate Webpage(s)	https://doi.org/10.1107/S0108768191014428
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article