Synthesis and structural characterization of an unusual heptameric aluminum imide and the surface fluorination products of the Al7N7 and Al4C4N4 cores

Fluorine functionalized compounds of group 13 elements

“…This class of compounds containing Al-N bonds also incorporate aluminum imide clusters which are oligomeric in nature and are of the composition (RNAlH)n (n = 4, 6, or 8) [44][45][46]. The rational synthesis of the n = 7 derivative (RCH 2 NAlH) 7 by our group adds an important compound to this series with R = 1-adamantyl [47]. Thus, the reaction of (1-adamantyl)cyanide with an excess of AlH 3 ÁNMe 3 afforded the heptameric aluminum imide cluster [(1-adamantyl)CH 2 NAlH] 7 .…”

“…We utilized this molecule to functionalize the hydrides by fluorides in a manner similar to that applied for the carbaalane clusters. This involves the treatment of [(1-adamantyl)CH 2 NAlH] 7 with Me 3 SnF [47]. However, this reaction resulted only in partial fluorination and yields a compound of an average composition [(1-adamantyl)CH 2 NAl] 7 F 2.26 H 4.74 having an asymmetric Al 7 N 7 core as shown in Scheme 5.…”

“…In contrast to the fluorination of (1-adamantyl)CH 2 NAlH) 7 cluster the fluorination of (tBuNCH 2 AlH) 4 proceeds smoothly and integrity of the Al 4 C 4 N 4 core is retained after fluorination [47]. Thus, the tetra fluoro compound (tBuNCH 2 AlF) 4 containing terminal Al-F units was obtained by the treatment of the corresponding hydride (tBuNCH 2 AlH) 4 with Me 3 SnF as depicted in Scheme 6.…”

Preparation of fluorine compounds of groups 13 and 14: a study case for the diagonal relationship of aluminum and germanium

“…The Al 4 C 4 N 4 core with four F atoms in place of the four H atoms is retained in the tetrafluoro derivative [11]. The four Al atoms form a distorted tetrahedral geometry with D 2d symmetry.…”

“…[13] À154.8 (n-Bu 4 N)((Me 3 Si) 3 CMeAlF 2 ) [13] À145.93 (t-BuNCH 2 AlF) 4 [11] À155.7 [(AlF) 6 (AlNMe 3 ) 2 (CCH 2 CH 2 SiMe 3 ) 6 ] [9] À181.5…”