New Stable Germylenes, Stannylenes, and Related Compounds. 1. Stable Germanium(II) and Tin(II) Compounds M(OCH₂CH₂NMe₂)₂ (M = Ge, Sn) with Intramolecular Coordination Metal−Nitrogen Bonds. Synthesis and Structure

Abstract

New stable monomeric germanium(II) and tin(II) compounds M(OCH 2 CH 2 NMe 2 ) 2 (M ) Ge (1); M ) Sn (2)), stabilized by two intramolecular coordination MrN bonds and containing no bulky groups on the metal atoms, were synthesized. The molecular and crystal structures of these compounds, and that of the previously synthesized compound (ArO) 2 Sn (3; Ar ) 2,4,6-(Me 2 NCH 2 ) 3 C 6 H 2 ), were determined by X-ray diffraction analysis. The electronic structures of 1 and 2 were studied by the DFT method.

Ate complexes of Ge(II) and Sn(II) with bidentate ligands [LiE14(OCH2CH2NMe2)3]2 (E14=Ge, Sn): synthesis and structure

“…We have recently studied a series of sterically nonhindered monomeric compounds RE 14 OCH 2 CH 2 NMe 2 (E 14 ¼ Ge, R ¼ Cl, OCOMe, OCH 2 CH 2 NMe 2 ; E 14 ¼ Sn, R ¼ OCH 2 CH 2 NMe 2 ) containing bidentate ligands [9,10]. Their high thermodynamical stability is due to the presence of intramolecular coordination bonds E 14 N. In this paper we report the synthesis of ate complexes [LiE 14 (OCH 2 CH 2 NMe 2 ) 3 ] 2 (E 14 ¼ Ge (1), Sn (2)) with bidentate ligands OCH 2 CH 2 NMe 2 and discussed the structural patterns in the solid-state and in solution as established by X-ray diffraction study and NMR spectroscopy.…”

New stable germylenes, stannylenes, and related compounds 7. Synthesis and structures of compounds Hal—Sn—OCH2CH2NMe2 (Hal = Cl or F)

“…The Sn-O distances in the four membered Sn 2 O 2 rings in these compounds are 2.139(4), 2.141(4) and 2.153(2), 2.156(2) Å ([ClSnOBu t ] 2 (9)), 6,7 2.168(4) and 2.173(4) Å ([(Me 3 Si) 2 NSnOBu t ] 2 ), 9 2.079(4) and 2.099(4) Å ([Ph 3 SiOSnOBu t ] 2 ), 10 2.128(4) and 2.165(4) Å ([Sn(OBu t ) 2 ] 2 ), 6 and 2.141(2), 2.167(2), and 2.169(2), 2.193(2) Å (dinuclear calixarene [Bu t calix]Sn 2 ). 11 More over, the tin atoms in chloroalkoxide 9 are involved in short intermolecular nonbonded contacts with the chlo rine atoms (3.619 or 3.722 Å; the sum of the van der Waals radii of the Sn and Cl atoms is ~4.00 Å).…”

“…Earlier, 2 we have demonstrated that bidentate β di methylaminoethoxy ligands stabilize the divalent germa nium and tin compounds M(OCH 2 CH 2 NMe 2 ) 2 (M = Ge (1) or Sn (2)) in the monomeric form without steric shielding of the reactive center M by the bulky substitu ents. In the case of the germanium(II) derivatives, the presence of only one Me 2 NCH 2 CH 2 O ligand is sufficient for stabilization of the monomeric unsymmetrical com pounds XGeOCH 2 CH 2 NMe 2 (X = Cl (3) or OAc (4)).…”

Initiation of ethylene polymerization on organoelement cations L2MMe+ (M = Ge, Sn) with intramolecular coordination bonds: a theoretical study

“…20 Calculations were carried out using the PRIRODA program. 21 We have used this approach and program earlier in studies of stable germylenes and stannylenes, 22 ionic and covalent compounds of Ge IV and Sn IV (see Refs 14 and 15), and heteroorganic betaines. 23…”