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1.  catena-Poly[(μ-anilido)(μ-1,2-dimeth­oxy­ethane-κ3-O,O′:O)sodium] 
In the title compound, [Na(C6H5NH)(C4H10O2)], the Na+ cation is coordinated by the N atoms of two anilide anions, two O atoms of a chelating 1,2-dimeth­oxy­ethane (dme) ligand and one O atom of an adjacent dme ligand. The coordination polyhedron around Na+ corresponds to a distorted square pyramid with the N atoms of the anilide groups and the O atoms of the chelating dme unit at the base and a third O atom at the apical position. The anilide anions act as μ-bridging ligands and the 1,2-dimeth­oxy­ethane mol­ecules display a μ2-κ3-O,O′ coordination mode. As a result of this connectivity, a polymeric chain structure parallel to [100] is formed, consisting of Na2O2 and Na2N2 four-membered rings. It should be noted that the remaining H atom of the anilide NH group is not involved in hydrogen bonding.
doi:10.1107/S1600536812040500
PMCID: PMC3470181  PMID: 23125625
2.  [3-Meth­oxy-1-(phenyl­sulfan­yl)prop­yl]triphenyl­tin(IV) benzene 0.17-solvate 
In the title compound, [Sn(C6H5)3(C10H13OS)]·0.17C6H6, the SnIV atom exhibits a slightly distorted tetra­hedral coordination geometry built up by four C atoms, which are the three ipso-C atoms of the phenyl rings and the α-C atom of the deprotonated γ-O-functionalized propyl phenyl sulfide. The benzene mol­ecule lies about a threefold rotoinversion axis.
doi:10.1107/S1600536811055474
PMCID: PMC3274883  PMID: 22346830
3.  Hydrogen 4-ammonio­phenyl­phospho­n­ate 
The title compound, C6H8NO3P, is isostructural with p-arsanilic acid. It exists as the zwitterion H3N+C6H4PO3H−. In the crystal, mol­ecules are linked by O—H⋯O and N—H⋯O hydrogen-bond bridges, giving a three-dimensional network structure. The strongest hydrogen bonds are formed between adjacent PO3H groups with O⋯O distances of 2.577 (2) Å.
doi:10.1107/S1600536811055218
PMCID: PMC3274954  PMID: 22346907
4.  Bis(hydrogen l-glutamato)palladium(II) 
In the title compound, [Pd(C5H8NO4)2], the Pd(II) atom is coordinated by two O atoms and two N atoms of two N,O-chelating hydrogen l-glutatmate ligands in a square–planar geometry with the N and O atoms in a mutually trans arrangement. The complex units are embedded in a network of N—H⋯O and O—H⋯O hydrogen-bonding inter­actions that stabilize the three-dimensional crystal structure. The strongest hydrogen bonds are formed between the γ-COOH untis of adjacent glutamate ligands, leading to dimers of the type R 2 2(8) with O⋯O separations of 2.640 (6) Å.
doi:10.1107/S1600536811035860
PMCID: PMC3201544  PMID: 22065700
5.  Tetra­carbonyl-1κ2 C,3κ2 C-bis[1,3(η5)-cyclo­penta­dien­yl]dihydroxido-2κ2 O-diirontin(2 Fe—Sn) monohydrate 
In the title hydrate, [Fe2Sn(C5H5)2(OH)2(CO)4]·H2O, the central Sn atom is tetra­hedrally coordinated by two {Cp(CO)2Fe} fragments and two hydroxide groups. The [{Cp(CO)2Fe}2Sn(OH)2] and water mol­ecules are linked by O—H⋯O hydrogen bridges, giving two-dimensional arrays with 4.82 topology that stack along the c axis.
doi:10.1107/S1600536810021975
PMCID: PMC3006954  PMID: 21587729
6.  (Acetato-κO)(2,2′-bipyridine-κ2 N,N′)trimethyl­platinum(IV) monohydrate 
In the title hydrate, [Pt(CH3)3(CH3COO)(C10H8N2)]·H2O, the PtIV atom exhibits a distorted octa­hedral coordination geometry built up by three methyl ligands in a facial arrangement, a bipyridine ligand and a monodentately bound acetate ligand. In the crystal structure, inter­molecular O—H⋯O hydrogen bonds are observed between the water mol­ecule and the platinum complex, which link the mol­ecules into chains along the c axis.
doi:10.1107/S160053681000499X
PMCID: PMC2983493  PMID: 21580231
7.  Time-resolved flow-flash FT-IR difference spectroscopy: the kinetics of CO photodissociation from myoglobin revisited 
Analytical and Bioanalytical Chemistry  2009;394(7):1869-1877.
Fourier-transform infrared (FT-IR) difference spectroscopy has been proven to be a significant tool in biospectroscopy. In particular, the step-scan technique monitors structural and electronic changes at time resolutions down to a few nanoseconds retaining the multiplex advantage of FT-IR. For the elucidation of the functional mechanisms of proteins, this technique is currently limited to repetitive systems undergoing a rapid photocycle. To overcome this obstacle, we developed a flow-flash experiment in a miniaturised flow channel which was integrated into a step-scan FT-IR spectroscopic setup. As a proof of principle, we studied the rebinding reaction of CO to myoglobin after photodissociation. The use of microfluidics reduced the sample consumption drastically such that a typical step-scan experiment takes only a few 10 ml of a millimolar sample solution, making this method particularly interesting for the investigation of biological samples that are only available in small quantities. Moreover, the flow cell provides the unique opportunity to assess the reaction mechanism of proteins that cycle slowly or react irreversibly. We infer that this novel approach will help in the elucidation of molecular reactions as complex as those of vectorial ion transfer in membrane proteins. The potential application to the oxygen splitting reaction of cytochrome c oxidase is discussed.
doi:10.1007/s00216-009-2871-0
PMCID: PMC2709881  PMID: 19521691
Carbonmonoxymyoglobin; Cytochrome c oxidase; Microfluidics; Step-scan spectroscopy; Vibrational spectroscopy
8.  Dibromidodimethyl­dipyridine­platinum(IV) 
In the title complex, [PtBr2(CH3)2(C5H5N)2], the PtIV metal centre lies on a twofold rotation axis and adopts a slightly distorted octa­hedral coordination geometry. The structure displays weak intra­molecular C—H⋯Br hydrogen-bonding inter­actions.
doi:10.1107/S160053680803208X
PMCID: PMC2959558  PMID: 21580838
9.  N,N′-Bis[2-(methoxycarbonyl)ethyl]ethane-1,2-diammonium dichloride 
In the crystal structure of the title compound, C10H22N2O4 2+·2Cl− or (H2Me2eddp)Cl2 (H2Me2eddp2+ is the dimethyl N,N′-di-3-propane­carboxylato­ethane-1,2-diyldiimin­ium cation), the packing is stabilized by an infinite two-dimensional ⋯Cl⋯H—N—H⋯Cl⋯ hydrogen-bonding network. In addition, short C—H⋯Cl contacts are observed.
doi:10.1107/S1600536808016565
PMCID: PMC2961765  PMID: 21202869
10.  Tris(propane-1,2-diamine-κ2 N,N′)nickel(II) tetra­cyanidoplatinate(II) 
In the title compound, [Ni(C3H10N2)3][Pt(CN)4], the [Pt(CN)4]2− anion with the environment of the PtII atom, lying on a mirror plane, is square planar, whereas the NiII atom in the [Ni(C3N2H10)3]2+ cation, also lying on a mirror plane, has a slightly distorted octa­hedral coordination geometry. Three chiral 1,2-diamino­propane mol­ecules, which are disordered equally over two sets of positions, adopt Δ(δδδ) and Δ(λλλ) configurations. The average Ni—N and Pt—C bond lengths are 2.131 (10) and 1.988 (10) Å, respectively. The cations and anions are connected by N—H⋯N hydrogen bonds.
doi:10.1107/S1600536807066913
PMCID: PMC2915156  PMID: 21200578

Results 1-10 (10)