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Palladium and platinum dihalide complexes with DL-selenomethionine
No full textPalladium and platinum dihalides react with DL-selenomethionine (sem), yielding the complexes [M(sem)X-2](M = Pd,X = Cl or Br;M = Pt,X = Cl) and, in the presence of N,N-dimethylformamide (dmf), the species [M(sem)X-2].dmf (M = Pd, X = I: M = Pt, X = Cl, Br or I). The complexes were characterized by i.r, and proton n.m.r. spectroscopy and by thermogravimetric analysis, and their properties were compared with those of the DL-methionine analogues [M(Met)Cl-2] and [Pt(Met)Cl-2].dmf. On the basis of n.m.r. data in deuteriated dimethyl sulfoxide, the platinum complexes undergo ligand rearrangement to form [Pt(sem)(2)](2+) moieties whereas the solvent does not seem to interact with the palladium coordination sphere, which contains the chelated N, Se ligand
TIN AND GERMANIUM COMPLEXES WITH MALTOL
No full textThe reaction of tin and germanium tetrachlorides with 3-hydroxy-2-methyl-4H-pyran-4-one (HMa) in benzene yielded M(HMa)(4)Cl-4.C6H6 (M = Sn or Ge) adducts, whereas in methanol the MMa(2)Cl(2) complexes have been isolated. Moreover, tin complexes with the neutral donors 2,6-dimethyl-4H-pyran-4-one (DMP) and 2,6-dimethyl-4H-pyran-4-thione (DMTP), having formulae Sn(L)(2)Cl-2 and Sn(L)(2)Cl-4(L = DMP or DMTP) have been prepared. The compounds have been characterized by ir and proton nmr spectroscopy and by thermogravimetric (TG and DTA) analysis. The thermal behaviour of all complexes has been followed to 1200 degrees C. The stability of the M(HMa)(4)Cl-4 adducts in various solvents is discussed on the basis of proton nmr spectr
COMPLEXING BEHAVIOR OF SCHIFF-BASES DERIVED FROM 3-ACETYL-4-HYDROXY-6-METHYL-2H-PYRAN-2-ONE
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