Synthesis and Structures of Intramolecularly Base-Coordinated Aryl Group 15 Compounds

Several group 15 compounds of the type EAr3 (Ar =
2-[(dimethylamino)methyl]phenyl; E = As (4),
Sb (5), Bi
(6)) have been prepared via salt elimination reactions of
2-(Me2NCH2)C6H4Li
and ECl3. Treatment of the lithium
salt of the 8-(dimethylamino)-1-naphthyl ligand (Ar‘) with
AsCl3 afforded a triaryl derivative, AsAr‘3
(7). The
X-ray crystal structures of 4−7 are described,
and the observed trends in the degree of intramolecular
coordination
of the nitrogen atoms are discussed. Crystal data for
4: monoclinic, space group
P21/c, a =
8.9336(6) Å, b =
16.347(2) Å, c = 17.875(2) Å, β =
102.540(7)°, V = 2548.2(4) Å3,
Z = 4, R = 0.0579. Crystal data for
5:
monoclinic, space group P21, a =
9.288(2) Å, b = 18.356(4) Å, c =
15.566(2) Å, β = 90.28(2)°, V =
2654.1(8)
Å3, Z = 4, R = 0.0520.
Crystal data for 6: monoclinic, space group
P21, a = 9.2996(12) Å,
b = 18.445(3) Å,
c = 15.601(2) Å, β = 90.076(11)°,
V = 2676.1(7) Å3, Z = 4,
R = 0.0783. Crystal data for 7:
monoclinic, space
group P21/c, a =
9.5744(12) Å, b = 16.273(2) Å, c
= 18.884(3) Å, β = 100.708(11)°, V =
2890.9(7) Å3, Z =
4, R = 0.0495.