Chelate-stabilized zinc complexes of alcohols and carbonyl compounds: pyridylphenylketone and pyridylphenylmethanol

The reactions of various zinc salts with the chelating ketone pyridylphenylketone (PPK) and the chelating alcohol pyridylphenylmethanol (PPM) were studied. 2:1 reactions of PPK with ZnX2 yielded octahedral complexes (PPK)2ZnX2 with X=OSO2CF3, Cl, Br, NCS. 1:1 reactions yielded the square pyramidal complexes [(PPK)2ZnHal]2ZnHal4 with X=Br, I and the trigonal-bipyramidal complex [(PPK)Zn(NCS)2]2. With Zn(SC6F5)2 the tetrahedral 1:1 complex (PPK)Zn(SC6F5)2 resulted. Methanol as a coligand was incorporated in the octahedral complex [(PPK)2Zn(CH3OH)2](BF4)2. Of the PPM complexes, only (PPM)2Zn(OSO2CF3)2 was analogous to the corresponding PPK complex. The zinc halides produced the octahedral complexes [(PPM)3Zn]ZnHal4 with X=Cl, Br. Zn[N(SiMe3)2]2 and PPM yielded polymeric zinc pyridylphenylmethoxide.