Formation, crystal and molecular structures of heteroleptic zinc(II) tri-tert-butoxysilanethiolates with ZnNO2S2 and ZnN2S2 coordination pattern
摘要:
Five zinc tri-tert-butoxysilanethiolates containing heterocyclic, aromatic bases coordinated to zinc ion were synthesized. All obtained complexes are monomeric with ZnS2NO2 or ZnS2N2 core and formula: Zn(SSi(OBu')(3))(2)L, where L is alpha-picoline (pic), 2,4-lutidine (lut) or N-methylimidazole (meim) or Zn(SSi(OBu')(3))(2)L-2 where L is pyridine (py) or N-methylimidazole. The complexes are formed in the two-stage synthesis. First zinc acetyloacetonate Zn(acac)2 reacts with tri-tert-butoxysilanethiol with the formation of [Zn{mu-SSi(OBu')(3)}(acac)](2) [1]. Subsequent addition of heterocycle leads to decomposition of [Zn{mu-SSi(OBu')(3)}(acac)](2) and complexes Zn(SSi(OBu')(3))(2)L or Zn(SSi(OBu')(3))(2)L-2 are formed. Crystal structure determinations of the obtained complexes reveal distorted tetrahedral (Zn(SSi(OBu')(3))(2)L-2) or bipyramidal (Zn(SSi(OBu')(3))(2)L) coordination of zinc atom. In the case of Zn(SSi(OBu')(3))(2)L the immediate environment of zinc atom consists of two thiolate sulfur atoms, aromatic nitrogen and two oxygen atoms from tert-butoxy groups of tri-tert-butoxysilanethiolate completing coordination sphere. (C) 2003 Elsevier B.V. All rights reserved.
Zinc tri-tert-butoxysilanethiolates. Syntheses, properties and crystal and molecular structures of [Zn{μ-SSi(OBut)3}(acac)]2 and [{(ButO)3SiS}(H2O)2Zn{μ-SSi(OBut)3}Zn(acac){SSi(OBut)3}]
摘要:
Heteroleptic, neutral tri-tert-butoxysilanethiolates of zinc, incorporating acetylacetonate (1) or acetylacetonate and a ater (2) as additional ligands, have been prepared by a reaction of zinc acetylacetonate with tri-tert-butoxysilanethiol in acetonitrile and characterized by IR, NMR and MS techniques. Crystal and molecular structures have been determined by single crystal X-ray structural analysis. Both are bimetallic with a distorted tetrahedral ligand arrangement at the zinc and ZnO2S2 core. Complexes 1 and 2 are the first structurally characterized thiolates where the metal is also bonded to acetylacetonate and 2 is the first neutral aqua-ligated zinc thiolate. (C) 2001 Elsevier Science Ltd. All rights reserved.