Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, the author is Cusack, Paul A. and a compound is mentioned, 33100-27-5, 1,4,7,10,13-Pentaoxacyclopentadecane, introducing its new discovery. 33100-27-5
Synthetic and Structural Studies of Tin(IV) Complexes of Crown Ethers
Fourteen inorganic tin(IV) and organotin(IV) complexes of crown ethers (L), of general formulae SnX4*L*2H2O, SnCl4*L*4H2O*nCHCl3 ( n = 0 or 1), (SnR2X2)n*L*2H2O ( n = 1 or 2), and (SnPh3X)2*L*2H2O, have been synthesised.The structure and bonding in these adducts are discussed in terms of their i.r. and 119Sn Moessbauer spectroscopic data.These suggest co-ordination to the tin either by one or more of the polyether O atoms, or by the water molecules of hydration (the crown ether acting as a second-sphere ligand).The latter structure is confirmed by a single-crystal X-ray determination of Sn(OH2)2Cl4*18-crown-6*2H2O*CHCl3.The crystals are monoclinic, space group P21/n, with a = 10.315(6), b = 13.630(8), c = 20.649(13) Angstroem, and beta = 94.68(5) deg.The structure was solved using multisolution direct methods and refined by least squares to R = 0.062 (R’ = 0.068) for 3142 observed diffractometer data.The water molecules within the octahedral Sn(OH2)2Cl4 units are found to be cis to each other and are involved in an extensive hydrogen-bonding scheme.The latter links together the 18-crown-6 molecules, unco-ordinated water molecules, and Sn(OH2)2Cl4 octahedra, to give hydrogen-bonded chains which run parallel to the b axis.
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Reference£º
Chiral Catalysts,
Chiral catalysts – SlideShare