Synthesis, Characteristics, and Biocidal Effect of New Protective Compositions Based on Complexes of Mn(II) with 1,10-Phenanthroline in Relation to Microscopic Fungi Isolated from Wood of the Arctic Regions of Russia

The biocidal action of new protective compounds based on polycrystalline mono-, bis-, and tris-chelate 1,10-phenanthroline acetate complexes of Mn(II) in relation to a wide range of microscopic fungi: Cadophora fastigiata ID-382 and ID-494, Hormodendrum pyri ID-126, Leptosphaeria sclerotioides ID-433, Paraphoma fimeti ID-110a, Penicillium aurantiogriseum ID-408, Thelebolus microspores ID-423, Tricellula aquatica ID-533 isolated from wood of the Arctic regions of Russia is studied. Acetate complexes of Mn(II) with mono-, bis-, and tris-chelate-coordinated 1,10-phenanthroline: Mn(phen)(OAc)2·2H2O, Mn(phen)2(OAc)2·2H2O, and [Mn(phen)3](OAc)2·5H2O are synthesized starting from manganese(II) acetate tetrahydrate Mn(OAc)2·4H2O and 1,10-phenanthroline monohydrate phen·H2O by complex formation in melts. The obtained complexes are characterized by IR spectroscopy, ESP, and diffractometry. All three compounds exhibit strong fungistatic and fungicidal activity that is most pronounced for the coordination-saturated tris-chelate [Mn(phen)3](OAc)2·2H2O with maximally hydrophobic cations. The obtained results show the prospects of searching among carboxylate complexes of manganese(II) with coordinated 1,10-phenanthroline for effective environmentally friendly biocides for protecting wood from biodegradation under the conditions of the Arctic regions of Russia.