Structural features of several heteroborane complexes of divalent platinum. Crystal structure of the product of the thermal treatment of 9-bis(triphenylphosphine) platina-6-carbodecaborane (in Russian)
An x-ray diffaction investigation of the product (I) of the thermal treatment of the complex 9-(PPh/sub 3/)/sub 2/Pt-6-CB/sub 8/H/sub 12/ (II) at 253/sup 0/C has been carried out (lambda Mo, least-squares method in the anisotropic (Pt, P)-isotropic approximation to R = 0.082, according to 3859 reflections). The crystals of complex I are triclinic: a = 10.466, b = 13.747, c = 15.096 A, ..cap alpha.. = 71.73, ..beta.. = 87.73, ..gamma.. = 79.77/sup 0/, Z = 2, space group P1. The structural change upon the transition from complex II to I involves the attachment of the carborane ligand to two phenyl groups (one in each of the phosphine ligands), i.e., the formation of the condensed ligand CB/sub 8/H/sub 10/(C/sub 6/H/sub 4/PPh/sub 2/)/sub 2/ (L), which forms two Pt-P sigma bonds (their mean length is 2.297 A, and the PPtP angle is 109.5/sup 0/) and a four-center Pt-3B bond of the ..pi..-allyl type (Pt-B = 2.08, 2.23, and 2.17 A). Crystals of complex I have been isolated in the form of the solvate PtL 0.5CHCl/sub 3/. A comparison of the lengths of the analogous B-B bonds in complexes I and II provides evidence that two terminal H atoms, rather than bridging atoms, are removed during the structural transition from II to I and that the five-membered PtBCCP chelate rings have folds along the B...P lines (the folding angles are 21 and 23/sup 0/).
- OSTI ID:
- 6357021
- Journal Information:
- Sov. J. Coordinat. Chem.; (United States), Vol. 11:3; Other Information: Translated from Koordinatsionnaya Khimiya; 11: No. 3, 400-410(Mar 1985)
- Country of Publication:
- United States
- Language:
- Russian
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
CARBORANES
CRYSTAL-PHASE TRANSFORMATIONS
HEAT TREATMENTS
STRUCTURAL CHEMICAL ANALYSIS
TRICLINIC LATTICES
PLATINUM COMPLEXES
BOND ANGLE
BOND LENGTHS
CATALYSTS
CATALYTIC EFFECTS
COORDINATION VALENCES
INTERATOMIC DISTANCES
LATTICE PARAMETERS
LEAST SQUARE FIT
MOLECULAR STRUCTURE
PHOSPHINES
TEMPERATURE EFFECTS
X-RAY DIFFRACTION
BORON COMPOUNDS
CARBON COMPOUNDS
COHERENT SCATTERING
COMPLEXES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
DIMENSIONS
DISTANCE
LENGTH
MAXIMUM-LIKELIHOOD FIT
NUMERICAL SOLUTION
PHASE TRANSFORMATIONS
PHOSPHORUS COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPLEXES
VALENCE
400201* - Chemical & Physicochemical Properties
360602 - Other Materials- Structure & Phase Studies