Department of Chemistry, Patna University, Patna-800 005, Bihar, India Manuscript received 1 October 2007, accepted 12 December 2007 A number of stable heterobinuclear alkali metal complexes of general formula MaPhN.MbL, where M8 Cull or Nill; Mb = Li, Na or K; PhN = N,N'-1,2-phenylene-bis(2-hydroxy-1-naphthaldimine); L = deprotonated onitrophenol (ONP), 2,4-dinitrophenol (DNP), 2,4,6-trinitrophenol (TNP) or 1-nitroso-2-naphthol (1N2N) have been synthesized using CuII or NiII metal chelates of Schiff base and alkali metal salts of ONP, DNP, TNP and 1N2N. The IR spectra suggest bonding between the NiII or CuII metal chelate and alkali metal which appear by dative bond via oxygen atoms of C-O (phenolic). Low value of molar conductance would suggest them to be non-electrolyte. These complexes are biologically active against bacteria viz. E. coli and S. aureus and fungus viz. C. albicans and so these may be treated as good antibacterial agents and fungicides. It was therefore, though interesting to synthesize the title compounds and examine their antimicrobial activity.