title: The synthesis and pH-dependent behaviour of Re(CO)3 conjugates with diimine phenolic ligands.
abstract: In this report we present a study of a series of Re(CO)3 pyridine-imine complexes with pendant phenol groups. We investigated the effects of the position of the phenol hydroxyl group (para, meta or ortho to the imine) on the steric and electronic characteristics of a series of Re(CO)3X(pyca-C6H4OH) compounds, where X = Cl, Br and pyca = pyridine-2-carbaldehyde imine. These compounds can be generated either via ligand synthesis followed by metal chelation (compound 4) or via a one-pot method (compounds 2, 3, 5 and 6). All six compounds show striking differences in pH-dependent UV-visible absorption based on the position of the phenol hydroxyl group.
authors.affiliation: Department of Chemistry, University of Akron, Akron, OH 44325-3601, USA.
authors.forename: Kullapa
authors.initials: K
authors.lastname: Chanawanno
authors.forename: James T
authors.initials: JT
authors.lastname: Engle
authors.forename: Kevin X
authors.initials: KX
authors.lastname: Le
authors.forename: Richard S
authors.initials: RS
authors.lastname: Herrick
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Ziegler
mesh_terms: D002248:Carbon Monoxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007097:Imines / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry; D012211:Rhenium / Q000737:chemistry*
chemical_list: D007097:Imines; D008024:Ligands; D009942:Organometallic Compounds; D010636:Phenols; D011725:Pyridines; D012211:Rhenium; D002248:Carbon Monoxide; C023666:pyridine
references.citation: Dalton Trans. 2011 Jul 28;40(28):7442-5
references.pmid: 21691650
references.citation: Dalton Trans. 2012 Feb 28;41(8):2304-13
references.pmid: 22183093
references.citation: Inorg Chem. 1998 Jul 13;37(14):3509-3516
references.pmid: 11670435
references.citation: Dalton Trans. 2009 Aug 21;(31):6192-200
references.pmid: 20449116
references.citation: Dalton Trans. 2010 Oct 28;39(40):9554-64
references.pmid: 20820607
references.citation: Nucl Med Biol. 2008 Feb;35(2):159-69
references.pmid: 18312825
references.citation: J Am Chem Soc. 2004 Jul 21;126(28):8598-9
references.pmid: 15250681
references.citation: Bioconjug Chem. 2002 Jul-Aug;13(4):750-6
references.pmid: 12121130
references.citation: Eur J Nucl Med Mol Imaging. 2002 Nov;29(11):1529-42
references.pmid: 12397472
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2010 Sep 30;66(Pt 10):m1335
references.pmid: 21587465
references.citation: Chembiochem. 2011 Feb 11;12(3):371-6
references.pmid: 21290535
references.citation: J Am Chem Soc. 2001 Apr 4;123(13):3181-2
references.pmid: 11457048
references.citation: Chemistry. 2008;14(31):9482-6
references.pmid: 18816564
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2010 Nov 24;66(Pt 12):m1647
references.pmid: 21589315