Abstract
Crystal of [Fe(Phen)(3)]Cl(PHB).2(PHBH).7H(2)O (1) is triclinic, space group P-1 with a = 12.0388(11) angstrom, b = 15.5286(14) angstrom, c = 15.7794(14) angstrom, alpha = 89.759(2)degrees, beta = 75.818(2)degrees, gamma = 71.900(2)degrees and Z = 2, (phen = phenanthroline, PHBH = p-hydroxybenzoic acid, PHB = p-hydroxybenzoate anion). The phen in adjacent Fe(phen)(3)(2+) cations are pi-pi interacted forming offset face to face (OFF) motifs. Juxtaposition of four phen ligands from two cations encapsulate an R-2(2)(8) dimeric unit of H-bonded PHBH molecules within a centrosymmetric box froming a filled aryl box motif (FAB). Alternation of OFF and FAB motifs form {OFF center dot center dot center dot FAB}infinity strands. The Fe(phen)(3)(2+) cation engages its phen ligands in pi-pi and/or CH-pi interactions with two crystalographically different PHBH molecules and one PHB anion. Seven water molecules and a chloride anion per iron(II) trisphenanthroline cation fill empty spaces in the structure forming a hydrophilic cluster. Extensive intermolecular H-bond interactions occur between water molecules, chloride anions, PHBH molecules, and PHB anions. Thermal analysis of (1) was done under N-2(g). The TG, and dTG curves revealed the expected mass losses. All associated processes are endothermic as shown in the DSC curve.