Group 12 metal complexes of tetradentate N2O2–Schiff-base ligands incorporating pyrazole: Synthesis, characterisation and reactivity toward S-donors, N-donors, copper and tin acceptors

摘要: New [M(Q)2(X)] derivatives (where M=Zn, Cd or Hg; Q=1-phenyl-3-methyl-4-R(C=O)-pyrazolon-5-ato; in detail: QL, R=C6H5; QB, R=CH2C(CH3)3; QS, R=CH(C6H5)2; X=EtOH H2O) have been synthesised and characterised. These compounds undergo a condensation reaction with the appropriate diamine ethanol, affording novel Schiff-base metal [M(diaquo)bis(1-phenyl-3methyl-4-R(C=N)-pyrazolone)(CH2)ndiimmine] (LnH2, R=C6H5, n=2, 3 4; BnH2, R=CH2C(CH3)3, SnH2, R=CH(C6H5)2, n=2 3; Hg). possess six-coordinate environment. A 113Cd NMR study has carried out on cadmium derivatives. The derivative [Zn(L2)(H2O)2] reacted CuCl2 Cu(ClO4)2 [Cu(QL)2] [Cu(en)2](ClO4)2 (en=ethylendiamine), respectively, upon breaking of C=N bond donor. In addition 1,10-phenanthroline (phen), yielding [Zn(QL)2(phen)]. Whereas when CdCl2, formation [Cd(L2)(H2O)2] due to exchange centre was observed. Finally [Zn(L2)(Hmimt)], likely containing five-coordinate ZnN2O2S central core, obtained from between 1-methylimidazolin-2-thione (Hmimt).