Über Pterinchemie. 90. Mitteilung. Synthese und Kristallstruktur des ersten chinoiden Dihydropterinmolybdän (IV)-Komplexes
✍ Scribed by Berthold Fischer; Joachim Strähle; Max Viscoittinf
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- German
- Weight
- 657 KB
- Volume
- 74
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Synthesis and Crystal Structure of the First Quinoid Dihydropterinmolybdenum(1V) Complex
The first molybdenum(1V) complex with a quinoid dihydropterin, i.e. 2, was isolated and characterized by IR, UV and NMR data and single-crystal X-ray diffraction. The reaction of MoV'02CI, with the biologically important 6B-5,6,7,8-tetrahydro-~-biopterin') (7) in MeOH gave almost quantitatively trichloro(l,5-quinoid-7,8dihydro-6H-~-biopterin)oxomolybdenum(IV) (2). The complex crystallizes with one molecule of MeOH in the noncentrosymmetric orthorhombic space group P2,2,2, (No. 19) with unit cell dimensions a = 1009.3(3), h = 1104.7(3), and c = 1484.5(4) pm and Z = 4. The Mo-atom has a distorted octahedral geometry (Fig. 1). It is coordinated by N(5) and O(4) of the pterin ligand. The distance of the Mo-N(5) bond (202 pm) is unusually short compared to similar complexes. O(4) is located trans to a terminal 0x0 ligand. The octahedral coordination is completed by three C1-atoms in a meridional arrangement. Complex 2, with the Mo-atom in the enzyme-relevant oxidation state +1V and the pterin in the intermediate quinoid dihydro form, should lead to an extension of the proposed 'common molybdenum cofactor' model. ') 89. Mitteilung: [l]. ' ) Wir benutzen fur die hydrierten Pterine die konsequent und eindeutig von uns vorgeschlagene Nomenklatur [2]. Laut CIP-Regeln ware die Konfiguration dieser Substanz 1 R,2S,6R.