Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1251, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molstruc.2021.131966
Keywords
Thiourea; Thiourea-dianion; Platinum; Palladium; Phosphine
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Funding
- Tikrit University
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A series of heterocyclic thiourea complexes were synthesized and their coordination properties and structures were analyzed by spectroscopic data. Some of these complexes exhibited high activity in antibacterial tests.
Treatment of one molar equivalent of [M(HCPPT)(2)] (M=Pd, Pt; H2CPPT = 1-(5-chloropyridin-2-yl)-3-phenylthiourea) with one molar equivalent of kappa(2)-diphos (diphos = dppe, dppp, dppb, and dppf) or two molar equivalent of kappa(1)-phos afforded eight heterocyclic thiourea dianion complexes (1-8). The spectroscopic data analysis showed clear AX splitting pattern, which indicates that the two coordinated phosphorus atoms are non-equivalent. Meaning that, the metal's center is attached to both S,N donor atoms in a chelating fashion. In addition, the splitting system show a good resemblance to the previously synthesized thiourea dianion complexes. Furthermore, the reaction is believed to undergo a square planar substitution mechanism at which five coordinate intermediate is formed. Generally, the reported complexes (1-8) are believed to resemble their analogues thiourea dianion complexes at which a four membered ring structure is formed with Pt(II) or Pd(II) being centered, adopting a square planar geometry. Four of the synthesized complexes (1-4) were tested against Salmonella typhimurium and Bacillus subtilis bacteria at which complexes 4 and 2 showed highest activity values. (C) 2021 Elsevier B.V. All rights reserved.
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