Synthesis of Ortho- and Meta-Re(I)-Metallocarboranes in Water

• Published in: Inorganic chemistry Vol. 44; no. 25; pp. 9574 - 9584
• Main Authors: Sogbein, Oyebola O, Green, Andrew E. C, Schaffer, Paul, Chankalal, Raymond, Lee, Edwin, Healy, Brian D, Morel, Pierre, Valliant, John F
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 12.12.2005
• Subjects: Boron Compounds - chemistry; Crystallography, X-Ray; Models, Molecular; Molecular Conformation; Organometallic Compounds - chemical synthesis; Organometallic Compounds - chemistry; Rhenium - chemistry; Water - chemistry
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/ic0511221

A series of metallocarboranes of the types rac-[M(CO)3(η 5-7-R-7,8-C2B9H11)]-, rac-[M(CO)3(η 5-7-R-8-R‘-7,8-C2B9H11)]-, and rac-[M(CO)3(η 5-7-R-7,9-C2B9H11)]- (M = Re) were prepared by reacting [NEt4]2[Re(CO)3Br3] or [Re(CO)3(OH2)3]Br with the corresponding carboranes in the presence of aqueous solutions of either alkali metal or tetraalkylammonium fluoride salts. Carborane derivatives that were investigated included those containing pyridine, amino, carboxylic acid, carbohydrate, and aryl substituents. During the course of the research, it was discovered that Re metallocarboranes can be prepared directly from the respective closo-clusters under similar reaction conditions used with nido-carboranes. Reaction yields ranged from modest to excellent depending on the carborane isomer and the nature of the cage substituent(s). A crystal structure of an amine-substituted Re metallocarborane was obtained where the complex crystallized in the orthorhombic space group P212121 with a = 8.982(2) Å, b = 11.563(3) Å, c = 16.811(4) Å, α = β = γ = 90°, V = 1746.1(7) Å3, Z = 4, and R1 = 0.0684.