@article {3831,
	title = {Interaction of derivatized capped iron(II) porphyrin complexes with CO and O-2},
	journal = {Inorganic Chemistry},
	volume = {35},
	number = {22},
	year = {1996},
	note = {ISI Document Delivery No.: VP449Times Cited: 5Cited Reference Count: 51},
	month = {Oct},
	pages = {6539-6545},
	type = {Article},
	abstract = {{A series of porphyrins strapped and capped by benzene and amidobenzene rings have been prepared. O-2 and CO bindings to their iron(II) complexes have been examined, and the role of hydrogen-bonding in stabilizing O-2 binding has been measured. Each comparison between the benzene ring (no H-bonding) and the amidobenzene ring analogues showed a free energy gain of similar to 1 kcal/mol (at -45 degrees C) for the amidobenzene derivatives. An X-ray structure analysis was carried out for the ferric (Cl-) complex of the benzene-capped porphyrin strapped by two butyl side chains. The crystals were monoclinic, with a = 10.557(3) Angstrom},
	keywords = {CARBON-MONOXIDE BINDING, cobalt, CRYSTAL-STRUCTURE, CYCLOPHANE HEMES, DIOXYGEN BINDING, DISTAL POLAR, HEME-PROTEINS, HUMAN OXYHEMOGLOBIN, LIGAND-BINDING, MYOGLOBINS, O2 BINDING},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1996VP44900026},
	author = {Tang, H. and Dolphin, D.}
}
@article {3006,
	title = {DIOXYGEN AND CARBON-MONOXIDE BINDING TO APOLAR CYCLOPHANE HEMES - DURENE-CAPPED HEMES},
	journal = {Journal of the American Chemical Society},
	volume = {116},
	number = {1},
	year = {1994},
	note = {ISI Document Delivery No.: MT212Times Cited: 40Cited Reference Count: 48},
	month = {Jan},
	pages = {6-14},
	type = {Article},
	abstract = {Detailed solution kinetic and equilibria data (mainly in toluene) are presented for the reversible binding of CO and O2 to the five-coordinate hemes Fe(por)B, where B is 1,5-dicyclohexylimidazole or 1,2-dimethylimidazole (chosen to mimic the R- and T-states, respectively) and por = the dianion of some durene-capped porphyrins with variable length linking methylene straps on either side of the durene moiety (4/4, 5/5, or 7/7 methylenes). Use of spectrophotometric equilibrium titrations from 30 to -50-degrees-C, stopped-flow data, and laser flash photolysis under either CO or CO/O2 mixtures, has allowed for determination of on and off rates, equilibrium constants, and, in the case of the 4/4-system, thermodynamic constants for the binding. Increasing steric hindrance provided by the durene cap, in the order 7/7 < 5/5 < 4/4, is generally less than expected from studies with other heme derivatives; in combination with the complete absence of polarity effects, as within nonpolar distal sites, the durene hemes exhibit poor differentiation between CO and O2. However, the distorted 4/4-derivative discriminates between CO and O2 in a novel way through a {\textquoteright}{\textquoteright}proximal effect{\textquoteright}{\textquoteright} associated with deformation of the porphyrin skeleton from planarity, the effect being largely reflected by an increased CO dissociation rate.},
	keywords = {BINDING, CO, CRYSTAL-STRUCTURE, FREE-BASE, HEMOGLOBIN, IRON(II) PORPHYRINS, LIGAND-BINDING, O-2, O2 BINDING, SPERM WHALE, T-STATE},
	isbn = {0002-7863},
	url = {<Go to ISI>://A1994MT21200002},
	author = {David, S. and James, Brian R. and Dolphin, D. and Traylor, T. G. and Lopez, M. A.}
}
