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organic compounds
The structure of the title compound [N,N'-methylenedipyridinium 1-iodononahydro-closo-decaborate(2-), C11H12N2+2.B10H9I2-] has been determinated by single-crystal X-ray diffraction at room temperature. This is the first halogeno derivative of closo-[B10H10]2- with the substituent in the apical position. The square pyramid with the capping ipso-B atom is slightly compressed. The B-I distance of 2.209 (6) Å in [1-IB10H9]2- is significantly shorter than the distance of 2.230 (2) Å in the [2-IB10H9]2- isomer.