New complexes of manganese(II) corresponding to [ Mn] and [ Mn.nL] ( CH3C6H4 and p-Cl-m-CH3C6H3; , L？=？N2C12H8, N2C10H8; , L？=？NC5H5, P(C6H5)3) have been synthesized and characterized by microelemental analyses (C, H, and N), magnetic susceptibility, molar conductance, thermogravimetric, cyclic voltammetry, and spectral analyses including ESI mass spectrometry, IR, and UV-visible. The presence of a four-and-six coordinated Mn atoms has been established in the complexes and adducts, respectively. Antimicrobial screening of the complexes against gram negative bacteria E. coli, K. pneumonia, and P. aeruginosa and fungus S. rolfsii has shown potential bioactivity. 1. Introduction Manganese has attracted the attention of several researchers owing to the fascinating physical and biochemical characteristics. The utility of manganese is quite diversified such as an alloying agent for aluminium, in dry cell batteries (carbon-zinc Leclanche type), oxidizing agent, and so forth [1]. In nature, manganese is present at the active site of a wide range of enzymes such as catalase and ribonucleotide reductase and participates in a variety of biological reactions [2]. Manganese(II) in its coordination compounds exhibits marked preference for hard donor atoms such as oxygen and nitrogen. Manganese(II) complexes containing soft donor atoms are scanty in number as compared with those of other transition metals, presumably due to difficulties encountered in preparing and preserving such complexes [3]. The first evidence for manganese binding to sulfur donor group in metalloprotein is tryptophan-modified Mn(III) containing acid phosphatise [4]. As compared to the other transition metals, manganese forms complexes with 1,1-dithio and 1,2-dithiolene ligands such as [Mn(SPh)4]2？, [MnCl(SPh)3]2？, [Mn4(SPh)10]2？, [Mn(edt)2]2？, [Mn2(edt)4]2？ (edt = ethane-1,2-dithiolate), and [Mn2(S2-O-xyl)2X2]2？ (X = PhS？, Et2NCS2？; X2 = S2-O-xyl2？) [5]. The high efficacy of the ligands containing sulfur atoms has been well established in metal chelation therapy and has high potency as fungicides and pesticides [6]. Among sulfur donor ligands, O,O′-dialkyl and alkylene dithiophosphates have been used for producing potential coordination compounds with most of the metals [7–10]. These soft donor ligands are versatile ligands which show both monodentate [11, 12]and bidentate [13–18] behaviour and form complexes with various metal ions, mainly transition metals [16–18]. Various dithiophosphate derivatives find extensive applications in agriculture [19], industries [20, 21], analytical studies [22],
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