The molecular structures of gaseous tetrakis(dimethylamino)-diboron, B2(NMe2)4, and tetrakis(methoxy)diboron, B2(OMe)4, as determined by electron diffraction

Abstract

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Transition Metal−Boryl Compounds: Synthesis, Reactivity, and Structure

“…55 The B-B bond distance is consistent with other known diborane(4) compounds which have been structurally characterized. 77,[110][111][112][113] The 11 B chemical shifts were also consistent with one boron atom in a typical diborane(4) environment (δ ) 40.3 ppm) and the other bound to a transition metal center (δ ) 62.7 ppm).…”

Triaminoboranes and Their Metallation toN-Lithiotriaminoboranes

“…0.04 Å is due to the negative charge at the oxygen atom. On the other hand, the BϪO distance [1.320(3) Å ] is shorter than those in B(OMe) 3 , (MeBO) 3 , [33] or B 2 (OMe) 4 , [34] and similar to the BϪO distances of 1.317(6) Å found in [thf·LiOB(mes) 2 ] 2 (mes ϭ 2,4,6-trimethlphenyl) [35] and 1.345 Å in [LiOB[CH(SiMe 3 ) 2 ] 2 . [36] The BϪO bond order in 7 is therefore higher than that in methylborates or trimethylboroxine, and this is also responsible for the longer BϪN bonds.…”

The Borane Complexes Htbo·BH3 and Htbn·BH3 (Htbo = 1,4,6‐Triazabicyclo[3.3.0]oct‐4‐ene, Htbn = 1,5,7‐Triazabicyclo[4.3.0]non‐6‐ene): Synthesis and Dehydrogenation to Dinuclear Boron Hydrides

“…[17] It also is longer than the ones measured in other diborane(4) molecules (with an average value of 170-171 pm). [18] For comparison, in B 2 Br 4 , [19] B 2 Br 2 (NMe 2 ) 2 [18] and B 2 (NMe 2 ) 4 , [20] B-B bond lengths of 168.9(2), 168.2(2) and 176.2(1) pm were measured. All B-N guanidine bond lengths are similar (av.…”