@article { ISI:000390294600013,
	title = {Synthesis and Coordination Chemistry of Hexadentate Picolinic Acid Based Bispidine Ligands},
	journal = {Inorg. Chem.},
	volume = {55},
	number = {24},
	year = {2016},
	month = {DEC 19},
	pages = {12531-12543},
	abstract = {<p>The synthesis and Cu-II, Ni-II, Zn-II, Co-II, and Ga-III coordination chemistry of the two isomeric hexadentate N5O ligands 6-{[}{[}9-hydroxy-1,5-bis(methoxycarbony1)-7-methyl-6,8-bis(pyridin-2-yl )-3,7-diazabicyclo{[}3.3.1]nonan-3-yl]methyl] picolinic acid (Hbispa(1a)) and 6-{[}{[}9-hydroxy-1,5-bis(methoxycarbony1)-7-methyl-2,4-bis(pyridin-2-yl )-3,7-diazabicyclo{[}3.3.1]nonan-3-yl]methyl]picolinic acid (Hbispa(1b)), picolinic acid-appended bispidines, are described. The two ligands are highly preorganized for octahedral coordination geometries and are particularly well suited for tetragonal symmetries, i.e., for Jahn-Teller labile ground states. This is confirmed by all data presented: solid-state structures, solution spectroscopy, electrochemistry, and CuII complex stabilities. Differences in the preorganization of the two isomers for the Jahn-Teller labile Cu-II centers are thoroughly analyzed on the basis of the crystal structures and an angular-overlap-model-based ligand-field analysis.</p>},
	issn = {0020-1669},
	doi = {10.1021/acs.inorgchem.6b01787},
	author = {Comba, Peter and Grimm, Laura and Orvig, Chris and Rueck, Katharina and Wadepohl, Hubert}
}
