Complexes of tertiary phosphines and tertiary arsines with molybdenum(IV)

Butcher, A. V.; Chatt, J.

doi:10.1039/j19700002652

Cited by 56 publications

(24 citation statements)

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“…[35] In one case, for L = PMe 2 Ph and X = Cl, both blue and green products could be isolated, depending upon the conditions. The two species in solution exhibited identical electronic and 1 H NMR spectra (solutions of the green compound rapidly changed to blue) but did show different IR bands (for crystalline samples as Nujol mulls), at 943 and 954 cm À1 for the green and blue species, respectively.…”

Section: Case 2: Bond-stretch Isomerism-some Evidence Is More Equal Tmentioning

confidence: 98%

Controversy in Chemistry: What Counts as Evidence?—Two Studies in Molecular Structure

Labinger

Weininger

2004

Angew Chem Int Ed

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Hindsight is a wonderful thing: Controversies are always difficult to characterize while they are in progress; however, as shown for the cases of stereochemistry and bond‐stretch isomerization, it is much easier once all the evidence has been amassed. These two examples have demonstrated how important it is to consider all the experimental results before coming to a conclusion. The second example shows above all that some evidence is more equal than others—crystal‐structure analysis was considered at all stages to be the most reliable.

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Section: Case 2: Bond-stretch Isomerism-some Evidence Is More Equal Tmentioning

confidence: 98%

Controversy in Chemistry: What Counts as Evidence?—Two Studies in Molecular Structure

Labinger

Weininger

2004

Angew Chem Int Ed

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“…[35] In einem Fall (L = PMe 2 Ph und X = Cl) konnten je nach den Reaktionsbedingungen sowohl blaue als auch grüne Produkte isoliert werden. In Lösung lieferten die beiden Spezies identische UV/Vis-und 1 H-NMR-Spektren (Lösungen der grü-nen Verbindung wechselten rasch die Farbe und wurden blau), aber ihre IRBanden (bei kristallinen Proben in Nujol) waren verschieden: 943 für die grüne und 954 cm À1 für die blaue Verbindung.…”

Section: Reale Versus Idealisierte Wissenschaftunclassified

Kontroversen in der Chemie: Was gilt als Beweis? – Zwei Studien zur Struktur von Molekülen

Labinger

Weininger

2004

Angewandte Chemie

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Hinterher ist man immer schlauer: Kontroversen zu charakterisieren, während sie im Gange sind, ist schwierig. Viel leichter ist dies, wie sich bei der Stereochemie und der Bindungslängenisomerie gezeigt hat, wenn alle Beweise vorliegen. Beide Beispiele belegen, wie wichtig es ist, alle experimentellen Ergebnisse zu berücksichtigen, bevor Schlüsse gezogen werden. Vor allem das zweite Beispiel zeigt, dass manche Beweise gleicher sind als andere – der Kristallstrukturuntersuchung galt in allen Phasen das größte Vertrauen.

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“…[2] Oxo complexes of molybdenum(IV) contain the MoO 2C group and have structures derived from octahedron with very strong Mo-O t bond. The molybdenum(IV) complexes have been isolated with phosphine, [3] Schiff base, [4] phthalocyanine, [5] 1,1-dithiolate, [6] 1,2-dithiolate, [7] and isonitrile [8] ligands. In oxidation state (IV), the molybdenum complexes have both oxo and nonoxo compounds are known, but the oxo species does not dominate the chemistry of molybdenum(IV) as it does that of molybdenum(V) and molybdenum(VI).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Spectroscopic Characterization of Mononuclear Oxomolybdenum(IV)O,O′-Ditolyl Dithiophosphate Complexes and Their Adducts With 2,2′-Bipyridyl and 1,10-Phenanthroline

Saraswat¹,

Kumar

2014

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

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A series of mononuclear oxomolybdenum(IV) O,O 0 -ditolyldithiophosphate complexes, of the type MoO[S 2 P(OR) 2 ] 2 (R D o-,m-,p-C 6 H 4 Me), were synthesized by refluxing of the reaction mixture containing triphenylphosphine and binuclear oxomolybdenum(V)O, O 0 -ditolyldithiophosphate, Mo 2 O 3 [S 2 P(OR) 2 ] 4 (R D o-,m-,p-C 6 H 4 Me), in equimolar ratio in dichloromethane. The desired pink colored Mo(IV) complexes were separated out by dissolving in cold n-hexane. The equimolar adducts of mononuclear oxomolybdenum(IV) O,O 0 -ditolyldithiophosphates with heterocyclic amines, MoO[S 2 P(OR) 2 ] 2. L (R D o-,m-,p-C 6 H 4 Me; L D 2,2 0 -bipyridyl and 1,10-phenanthroline), have been prepared by reacting the corresponding oxomolybdenum(IV) complexes with an excess of 2,2 0 -bipyridyl and 1,10-phenanthroline in a 1,1 molar ratio. The complexes have been characterized by elemental analysis, IR, 1 H. and 31 P NMR spectroscopy. Based on these, a square pyramidal structure incorporating bidentate dithiophosphate moieties is suggested and a six-coordinated distorted octahedral structure for the entire base adducts complexes. It appears that oxomolybdenum(IV) is preferentially stabilized by sulfur donors.

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Complexes of tertiary phosphines and tertiary arsines with molybdenum(IV)

Cited by 56 publications

References 0 publications

Controversy in Chemistry: What Counts as Evidence?—Two Studies in Molecular Structure

Controversy in Chemistry: What Counts as Evidence?—Two Studies in Molecular Structure

Kontroversen in der Chemie: Was gilt als Beweis? – Zwei Studien zur Struktur von Molekülen

Synthesis and Spectroscopic Characterization of Mononuclear Oxomolybdenum(IV)O,O′-Ditolyl Dithiophosphate Complexes and Their Adducts With 2,2′-Bipyridyl and 1,10-Phenanthroline

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