Keon Sang Ryoo

cis-(1,4,8,11-Tetra­aza­cyclo­tetra­decane-κN4)bis(­thio­cyanato-κN)chromium(III) thio­cyanate

The crystal structure of [Cr(NCS)2(cyclam)]NCS (cyclam = 1,4,8,11-tetraazacyclotetradecane, C10H24N4) has been determined by using synchrotron radiation at 98 K. The CrIII atom is in a slightly distorted octahedral environment with four N atoms of the macrocyclic ligand and two N-coordinated NCS− anions in cis positions. The average Cr—N(cyclam) and Cr—NCS bond lengths are 2.085 (5) and 1.996 (15) Å, respectively. In the crystal, the uncoordinating SCN− anion is hydrogen bonded through N—H⋯S and N—H⋯N interactions to neighbouring complex cations.

Crystal structure of bis­[trans-(1,4,8,11-tetra­aza­cyclo­tetra­decane-κ4N)bis­(thio­cyanato-κN)chromium(III)] tetra­chlorido­zincate from synchrotron data

The CrIII atoms in the title compound show a distorted octahedral coordination with four N atoms of the cyclam ligand in the equatorial plane and two N-coordinated NCS− groups in axial positions. The macrocyclic ligands adopt trans-III configurations. The crystal packing is stabilized by N—H⋯S and N—H⋯Cl hydrogen bonds.

3,14-Dimethyl-2,6,13,17-tetra­aza­tricyclo­[16.4.0.07,12]docosa­ne–(naphthalen-1-yl)methanol (1/2)

In the title co-crystal, C20H40N4·2C11H10O, the macrocycle is generated by a crystallographic inversion centre. The N atoms show a pyramidal coordination, and the cyclohexane ring that is fused to the 14-membered C10N4 ring exists in a chair conformation, whereas the methyl substituent occupies an axial site. The (naphthalen-1-yl)methanol molecule forms an O—H⋯N hydrogen bond to a cyclam N atom. The mean-square-plane passing through the 14-membered ring is approximately coplanar with the naphthalene fused-ring [dihedral angle = 6.6 (1)°].

Crystal structure of bis­[trans-di­chlorido­bis(propane-1,3-di­amine-κ2N,N′)chromium(III)] dichromate from synchrotron data

In the title organic–inorganic salt, [CrCl2(tn)2]2[Cr2O7] (tn is propane-1,3-diamine), the CrIII ions are coordinated by four N atoms from two tn ligands and two chloride ions in a trans geometry, displaying a distorted octahedral arrangement. The crystal packing is stabilized by N—H⋯Cl and N—H⋯O hydrogen bonds.

Bis[trans-di­fluorido­tetra­kis­(pyridine-κN)chromium(III)] sodium tetra­chlorido­zincate perchlorate from synchrotron data

The title salt, Na[CrF2(C5H5N)4]2[ZnCl4]ClO4, consists of two cationic CrIII complexes, an Na+ cation, one [ZnCl4]2− anion and one ClO4 − anion. The CrIII atoms are coordinated by four pyridine (py) N atoms and two F atoms in a trans arrangement, displaying a distorted octahedral geometry. The mean Cr—N(py) and Cr—F bond lengths are 2.086 (8) and 1.864 (14) Å, respectively. The [ZnCl4]2− anion has a distorted tetrahedral geometry. The most notable feature of the crystal packing is the formation of weak pyridine–perchlorate C—H⋯O hydrogen bonds, resulting in supramolecular chains along the b-axis direction. The perchlorate anion was disordered over two sets of sites in a 0.868 (3):0.132 (3) ratio.

Crystal structure of silver [(propane-1,3-diyl­dinitrilo-κ2N,N′)­tetra­acetato-κ4O,O′,O′′,O′′′]chromate(III) from synchrotron X-ray data

In the title complex, the Cr3+ ion is coordinated by the four O and two N atoms of the 1,3-pdta ligand, displaying a distorted octahedral geometry. The Ag+ cation is surrounded by six O atoms from neighboring 1,3-pdta groups and water molecules.

Crystal structure of cis-aqua­bis­(2,2′-bi­pyridine-κ2N,N′)chlorido­chromium(III) tetra­chlorido­zincate determined from synchrotron data

The CrIII ion in the title complex is coordinated by two 2,2′-bipyridine ligands, one water molecule and a chloride in a cis geometry, displaying an overall distorted octahedral environment. The slightly distorted tetrahedral [ZnCl4]2− anion is connected to the cation through O—H⋯Cl hydrogen bonds.