The elegant 2D multiquantum (MQ) MAS NMR has been applied to investigate the coordination of Al atoms in SAPO-34. The results show that the effects of the template and/or water on the coordination of Al atoms are sig...The elegant 2D multiquantum (MQ) MAS NMR has been applied to investigate the coordination of Al atoms in SAPO-34. The results show that the effects of the template and/or water on the coordination of Al atoms are significant, which lead to the formation of various Al species. Up to four kinds of Al species are distinctly resolved.展开更多
Reaction of W (CO)6 with HSC3H3N2, Et3N and Et4NCl. H2O inCH3CN afforded a mononuclear compound (Et4N] [W(CO)4 (SC4H3N2)]. The crystalstructure was determined by X-ray diffraction. The crystallographic data: C16H23-N3...Reaction of W (CO)6 with HSC3H3N2, Et3N and Et4NCl. H2O inCH3CN afforded a mononuclear compound (Et4N] [W(CO)4 (SC4H3N2)]. The crystalstructure was determined by X-ray diffraction. The crystallographic data: C16H23-N3O4SW, Mr = 537- 29, monoclinic, C2/c, a = 19. 3l7 (l0), b = 13. 75l (8), c=16. 350(8) A, β= l09. 93°, V= 4082. 7 A3, Z= 8, D.= 1. 75 g/cm', F(000) =2096, μ= 59. 0 cm-1, Final R=0. O29 and Rw= O. 036 for 2769 reflections with I>3σ(I). The X-ray structure analysis revealed that the center W atom is coordinated by Sand N atoms from 2-mercapto pyrimidine ligand and four C atoms from carbonyl,which displays a distorted octahedral geometry.展开更多
基金We are grateful to the support of the National Natural Science Foundation of China and the Ministry of Science and Technology of China. We appreciate Dr. R. Fu (NHMFL Tallahassee) for his kind help regarding the MQ MAS NMR experiments.
文摘The elegant 2D multiquantum (MQ) MAS NMR has been applied to investigate the coordination of Al atoms in SAPO-34. The results show that the effects of the template and/or water on the coordination of Al atoms are significant, which lead to the formation of various Al species. Up to four kinds of Al species are distinctly resolved.
文摘Reaction of W (CO)6 with HSC3H3N2, Et3N and Et4NCl. H2O inCH3CN afforded a mononuclear compound (Et4N] [W(CO)4 (SC4H3N2)]. The crystalstructure was determined by X-ray diffraction. The crystallographic data: C16H23-N3O4SW, Mr = 537- 29, monoclinic, C2/c, a = 19. 3l7 (l0), b = 13. 75l (8), c=16. 350(8) A, β= l09. 93°, V= 4082. 7 A3, Z= 8, D.= 1. 75 g/cm', F(000) =2096, μ= 59. 0 cm-1, Final R=0. O29 and Rw= O. 036 for 2769 reflections with I>3σ(I). The X-ray structure analysis revealed that the center W atom is coordinated by Sand N atoms from 2-mercapto pyrimidine ligand and four C atoms from carbonyl,which displays a distorted octahedral geometry.
