Quantitative ortho-cycloboronation of P-phenyl groups in metallaborane chemistry and the crystal and molecular structure of the novel iso-closo-ten-vertex metallaborane [1,1,1-H(PPh3)(Ph2P-ortho-C6H4)-iso-closo-(1-IrB9H8-2-)]

1982 ◽  
pp. 465 ◽  
Author(s):  
Jonathan Bould ◽  
Norman N. Greenwood ◽  
John D. Kennedy ◽  
Walter S. McDonald
Keyword(s):  
Molecular Structure ◽  
Crystal And Molecular Structure ◽  
The Novel

Crystal Structure of (NH4)2[Mo3S(S2)6] Containing the Novel Isolated Cluster [MO3S13]2-

1979 ◽  
Vol 34 (3) ◽  
pp. 434-436 ◽  
Author(s):  
A. Müller ◽  
S. Pohl ◽  
M. Dartmann ◽  
J. P. Cohen ◽  
J. M. Bennett ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Aqueous Solutions ◽  
Single Crystal ◽  
Ammonium Salt ◽  
Crystal And Molecular Structure ◽  
Monoclinic Space Group ◽  
The Novel ◽  
Mean Values ◽  
X Ray

Abstract The novel tri-nuclear metal-sulfur cluster [Mo3S(S2)6]2- can be obtained as its ammonium salt by the reaction of a Moiv containing aqueous solutions with polysulfide. Its crystal and molecular structure has been determined by a single crystal X-ray study. The crystals are monoclinic (space group Cm, with a = 11.577(6) Å, b = 16.448(7) Å, c = 5.716(2) Å, β = 117.30(3)°, V = 967.2 Å3 , Z = 2, dexptl. = 2.54(2) g/cm3 , dcal = 2.54 g/cm3). The structure consists of isolated [Mo3S(S2)6]2- units, with three Mo atoms at the vertices of a triangle. There are bridging as well as terminal S22--ligands lying above and below the Mo3-plane (bond distances: Mo-Mo = 2.722 Å, Mo-S(terminal) = 2.435, Mo-S(bridging) = 2.452, Mo3-S = 2.353(4) Å and S-S = 2.04 Å (mean values)).

Crystal and Molecular Structure of 7-Diethylamino-[1′,3′,3′-trimethyl-4-((1,3,3-trimethyl-1,3-dihydro-2H-indole-2-ylidene)methyl)-1′,3,3′,4-tetrahydrospiro[chromene-2,2′-indole]]: A Dicondensation Product From the Reaction of 4-Diethylaminosalicylaldehyde with Fischer's Base

2012 ◽  
Vol 65 (7) ◽  
pp. 779 ◽  
Author(s):  
Mohamed Ashraf ◽  
Graeme J. Gainsford ◽  
Andrew J. Kay
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Diffraction Data ◽  
Crystal And Molecular Structure ◽  
Atomic Resolution ◽  
Related Structure ◽  
The Novel ◽  
Data Comparison ◽  
Molecular Features

The novel molecule, 7-diethylamino-[1′,3′,3′-trimethyl-4-((1,3,3-trimethyl-1,3-dihydro-2H-indole-2-ylidene)methyl)-1′,3,3′,4-tetrahydrospiro[chromene-2,2′-indole]], was isolated as the product from the condensation of diethylaminosalicylaldehyde with two equivalents of Fischer’s base and its crystal structure determined, initially using MoKα radiation. The diffraction data at higher theta angles (d < 0.9 Å) was notably weak so a further dataset was collected using CuKα to determine the cause. Although a different crystal batch and larger crystal was used and a better dataset obtained (with significantly improved atomic resolution) the comparison shows that the essential molecular features and weak intermolecular binding are duplicated in the refinement with the latter data. Comparison is made with a closely related structure. Consistent with observations for this related structure it is proposed that the product is formed through the interception of an intermediate carbinol by Fischer’s base.

The Crystal and Molecular Structure of the Trinuclear Complex Bis[(μ-S)-α,α′-{(2-mercapto-5-methylbenzene-1,3-diyl)di(methylidyne)di(azino)}bis(cyclohexane-methanol)ato(3-)]tripalladium(II), L2Pd3. A New Coordination Mode for the Robson-Type Ligand L3-

1989 ◽  
Vol 42 (7) ◽  
pp. 1057 ◽  
Author(s):  
BF Hoskins ◽  
IAS Mcdonald
Keyword(s):  
Molecular Structure ◽  
Coordination Mode ◽  
Crystal And Molecular Structure ◽  
Trinuclear Complex ◽  
Binuclear Complexes ◽  
Central Metal ◽  
The Novel ◽  
X Ray Diffraction ◽  
Square Planar ◽  
Oxygen Groups

The crystal and molecular structure of the trinuclear complex L2Pd3 has been determined by single-crystal X-ray diffraction techniques at room temperatures, 20°C. The quinquedentate binucleating ligand, L3-, is formally the trianion α,α′-[(2-mercapto-5-methylbenzene-1,3-diyl )di(methylidyne)di(azino)]bis(cyclohexaemethano)ato(3-). Crystals of L2Pd3 are triclinic, PI, with a 11.896(1), b 13.4103(7), c 17.451(3) � , α 75.66(1), β 79.93(1) and γ88.99(1)�, Z 2. The structure was solved by the normal Fourier methods and refined by a least-squares procedure which gave final R and R, values of 0.046 and 0.049 respectively for the 7769 statistically significant reflections. The approximately square-planar coordination environments of the palladium centres give rise to a boat-shaped arrangement in which an approximate, non-crystallographic, twofold axis normal to the plane of the central metal is evident. The notable feature of the structure lies in the novel coordination mode adopted by the binucleating ligand. With respect to the binuclear complexes of this ligand, an electronic reorganization has occurred in one of the sidearms of both ligands which enables the formation of the pair of hydrazine bridges and also causes two of the terminal oxygen groups to become non-coordinating.

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