⋅ 2 v potential of Å). M ) during the aerial aggregation process [28]. King AP, Marker SC, Swanda RV, Woods JJ, Qian SB, Wilson JJ. c and H Found %: C, 46.95; H, 4.26; N, 13.43. 2 M O ). ) ⋅ N + 1 2 2 O H appear in the IR spectrum with weak to medium intensity, while 0 − 3 The IR data are discussed in terms of the nature of bonding and the structures of the two complexes. eCollection 2020. } H OH, − N 2 S Other applications of metal complexes of oximes include the design of Complexes 1 and 2 exhibit medium to strong intensity IR bands at are attributed to the 2 ): 3420 (wb), 3150 (m), 3069 (m), 2843 (m), 2363 (w), 2343 (w), 1654 (w), 1593 (s), 1561 (m), 1476 (s), 1437 (m), 1327 (m), 1285 (w), 1215 (m), 1124 (s), 1080 (s), 1030 (s), 1010 (s), 989 (s), 781 (s), 748 (m), 683 (m), 631 (m), 592 (m), 561 (w), 494 (w), 452 (w), and 447 (w). or O n 0 ⋅ 0 (py)C(Me)NOH and 2 with phenyl(2-pyridyl)ketone oxime, (py)C(ph)NOH, are not known to date, and it is currently not evident whether the stability of these species is dependent on the particular nature of the 2-pyridyl oxime ligand. ( ⋅ − shifts upwards in 1 (683  (py)C(Me)NOH, X-Ray data were collected at 298 K using a Crystal Logic Dual Goniometer diffractometer with graphite-monochromated (py)C(Me)NOH and 2 are also planned. 2 1 ) (py)C(Me)NOH established by single-crystal X-ray crystallography, the “correct” stoichiometry (1 : 2.5) was employed and led to the pure compound in high yield. it in a third party non-RSC publication you must This site needs JavaScript to work properly. 4 4 and 2 8 2 ) and N( M { = 4 − H 1 (py)C(Me)NOH) and (py)C(Me)NOH (Section 2) did not prove detrimental to the formation of the complex. The coordination geometry of the metal ion is distorted octahedral. l ) stretch) 1 1 Fetching data from CrossRef. M ( ( This work was supported by the Cyprus Research Promotion Foundation (Grant DIETHNIS/STOXOS/0308/14). (py)C(Me)NOH is attributed to the fact that one uncoordinated oxygen atom of each bidentate bridging sulfate is hydrogen bonded to the oxygen atoms of the neutral oxime groups (see Table 3) resulting in a further lowering of the sulphate symmetry [39]. O O (py)C(Me)NOH (1 ) O (py)C(Me)NOH should also have a I 3400  When the (2) was obtained. x 6 splits into two ones, while )  O O 4 CCDC 757892 and 757893 contain the supplementary crystallographic data for 1 appears as a single band [37, 39]. The oximic oxygen atom of each (py)C(Me)NOH ligand is very strongly intramolecularly hydrogen bonded to one uncoordinated formate oxygen atom. O O { t C vibrations for the free ligand appear as medium intensity bands at 1566 and 1116  − 1 O 3 m H i H O c N 3 ⋅ 3 2 m o ] n CH3CN (2), and [CoIIICoIIL(μ-CH3COO)2](ClO4) (3), derived from a tetraimino diphenolate macrocyclic ligand H2L, obtained on [2 + 2] condensation of 4-ethyl-2,6-diformylphenol and 2,2′-dimethyl-1,3-diaminopropane. O n O COVID-19 is an emerging, rapidly evolving situation. 1 − O I 2 The ESI-MS positive spectrum of complex 1 in the presence of 3,5-DTBCH2 has also been recorded and, interestingly, two positive ions [CoIIICoIIL(N3)2(3,5-DTBCH−)H]+ and [CoIICoIIL(μ-3,5-DTBCH2−)Na]+ have been identified. 4 ] ( The strong intermolecular π–π contacts are common in the observed dinuclear Cu 2+ and Co 2+ complexes of polybenzimidazole ligands. C the whole article in a third party publication with the exception of reproduction 1 These data can be obtained free of charge via http://www.ccdc.cam.ac.uk/conts/retrieving.html, or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: (+44)1223-336033; or e-mail: deposit@ccdc.cam.ac.uk. Most of these ligands contain a 2-pyridyl group, and thus are named 2-pyridyl oximes, (py)C(R)NOH (Scheme 1). Hydrogen atoms were either located by difference maps and were refined isotropically or were introduced at calculated positions as riding on bonded atoms.

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