Tetrakis(μ‐guanidino­acetic acid‐κ2O:O′)­bis­[(nitrato‐κO)copper(II)]

The title compound, [Cu₂(NO₃)₂(C₃H₇N₃O₂)₄], forms a centrosymmetric dimer, with the two Cu²⁺ ions separated by 2.6525 (6) Å. The asymmetric unit contains a Cu atom coordinated to two guanidino­acetic acid ligands (via one carboxyl­ate O atom from each ligand) and to a nitrate group. The inversion centre in P generates the entire mol­ecule, in which each Cu atom is coordinated to four carboxyl­ate and to one nitrate O atom; ignoring the Cu—Cu separation, the geometry about each Cu atom is square pyramidal. The amino acid ligand is in the zwitterionic form. Strong N—H?O hydrogen bonds lead to a three‐dimensional supramolecular structure, in which the N?O distances are in the range 2.931 (4)–3.278 (3) Å, with N—H?O angles ranging from 128 to 170°.     

Tetrakis(μ‐benzothiazole‐2‐thiolato)‐1:2κ4N:S2;1:2κ4S2:N‐dichloro‐1κCl,2κCl‐dirhenium(III)(Re—Re) dichloromethane solvate: a bridged complex with a long Re—Re quadruple bond

The title compound, [Re₂(C₇H₄NS₂)₄Cl₂]·CH₂Cl₂, consists of dirhenium mol­ecules with bridging N,S‐benzo­thia­zole‐2‐thiol­ate ligands, axial Cl^? ligands and intramolecular hydrogen bonding. These mol­ecules adopt somewhat staggered conformations, with a long Re—Re quadruple bond distance of 2.2716 (3) Å.     

Bis[1‐(pyridin‐2‐yl)­ethano­ne‐κN 4‐phenyl­thio­semicarbazonato‐κ2N4,S]­manganese(II)

One half of the mol­ecule of the title complex, [Mn(C₁₄H₁₃N₄S)₂], is related to the other half by a twofold axis passing through the Mn atom. This high‐spin Mn atom is six‐coordinated, in an octahedral geometry, by the azomethine N, the pyridyl N and the thiol­ate S atom of two planar 1‐­(pyridin‐2‐yl)­ethanone N(4)‐phenyl­thio­semicarbazone lig­ands. In the crystal, the mol­ecules are interconnected by N—­H?S and C—H?N interactions, forming a three‐dimensional network.     

catena‐Poly[[(N,N‐dimethyl­formamide‐κO)(nitrato‐κO)silver(I)]‐μ‐1,2‐bis­(diphenyl­phosphino)ethane‐κ2P:P′] at 100 and 293 K: temperature effects on the volume of the solvent pocket

In the title chain compound, [Ag(NO₃)(C₃H₇NO)(C₂₆H₂₄P₂)]_n, the bis­(diphenyl­phosphino)ethane (dppe) components lie across centres of inversion. The dppe units link the Ag⁺ ions into chains along [100]. A nitrate anion is coordinated to the Ag atom, together with one mol­ecule of N,N‐dimethyl­formamide (DMF) solvent. At room temperature, the coordinated DMF shows a long Ag—O distance [2.620 (3) Å] and relatively large thermal motion, while at 100 K the Ag—O distance is shorter [2.5588 (19) Å] and the thermal motion is similar to that of the rest of the complex. The behaviour of the DMF mol­ecule is related to the size of the solvent pocket, viz. 146 ų at 293 K and 131 ų at 100 K.     

trans‐Bis­[ethane‐1,2‐di­thiol­ato(2–)‐S,S′]­bis(2‐mer­cap­to­pyri­dine‐S)­tin(IV)

The title compound, [Sn(C₅H₅NS)₂(C₂H₄S₂)₂], was obtained from a 1:2 mixture of bis­(ethane‐1,2‐di­thiol­ato)­tin(IV) and 2‐mercapto­pyridine. The mol­ecules are discrete monomeric trans‐octahedral units, with the Sn^IV atom at the centre of symmetry, planar 2‐mercapto­pyridine zwitterions and SnS₂C₂ groups in twist–envelope conformations. The 2‐mercapto­pyridine ligands are monodentate and are bonded through the S atoms. The S—Sn distances between the S atom of edt (edt is ethane‐1,2‐di­thiol­ate) and the Sn atom are 2.473 (1) and 2.505 (1) Å, which are slightly longer than the S—Sn distance in Sn(edt)₂ of 2.390 (1) Å. The bond between the 2‐mercapto­pyridine S atom and the Sn atom are, remarkably, weaker than the S—Sn bond involving edt.     

Tetrakis­(pyridinium‐2‐thiol­ato)­zinc(II) dinitrate

The crystal structure of the title compound, [Zn(C₅H₅NS)₄](NO₃)₂, consists of a [Zn(C₅H₅NS)₄]²⁺ (C₅H₅NS is pyridinium‐2‐thiol­ate) cation and two nitrate anions. The central Zn^II atom lies at a site with imposed symmetry and is surrounded by four S atoms [Zn—S = 2.3371 (5) Å] from four symmetrical pyridinium‐2‐thiol­ate ligands in a distorted tetrahedral geometry. There are N—H⋯O hydrogen‐bonding interactions between the pyridinium‐2‐thiol­ate ligands and nitrate O atoms. In addition, π–π interactions via aromatic N‐containing ligands are discussed.     

catena‐Poly­[[tetra­aqua­iron(II)]‐μ‐succinato‐κ2O:O′]

The title complex, {[Fe(C₄H₄O₄)(H₂O)₄]}_n, is an infinite poly­meric compound bridged by the succinate dianion. Two carboxyl­ate groups coordinate in a monodentate manner to the Fe^II atom, in a trans fashion, with an O—Fe—O bond angle of 175.72 (6)° and Fe—O distances of 2.0886 (14) and 2.1008 (15) Å. One of the uncoordinated carboxyl­ate O atom forms an intramolecular hydrogen bond with a coordinated water mol­ecule. Extensive hydrogen bonding between parallel poly­meric complex chains results in a three‐dimensional supramolecular structure.     

Aqua­bis(2‐nitro­benzoato‐κO)(1,10‐phenanthroline‐κ2N,N′)­zinc(II)

The title compound, [Zn(C₇H₄NO₄)₂(C₁₂H₈N₂)(H₂O)], has been synthesized. X‐Ray analysis reveals that it is a neutral zinc(II) mononuclear carboxyl­ate complex based on mixed N‐ and O‐donor ligands. The Zn atom is five‐coordinate in a distorted trigonal–bipyramidal coordination environment involving two O atoms of two monodentate 2‐nitro­benzoate mol­ecules, two N atoms of a 1,10‐phenanthroline mol­ecule and one O atom of a water mol­ecule. The axial positions are occupied by a carboxyl­ate O atom from the 2‐nitro­benzoate ligand and an N atom from the 1,10‐phenanthroline ligand [N—Zn—O = 167.66 (9)°].     

Tetrakis­(tetra­hydro­furan‐κO)­lithium mer‐tris­(carbazolyl‐κN)‐trans‐di­chloro(tetra­hydro­furan‐κO)­zirconate

In the title compound, [Li(C₄H₈O)₄][ZrCl₂(C₁₂H₈N)₃(C₄H₈O)], the environment of the Zr atom is pseudo‐octahedral, with the three carbazolyl ligands in a mer configuration. The counter‐ion of the zirconium complex is composed of an Li atom surrounded by four tetra­hydro­furan (THF) mol­ecules. The THF mol­ecule attached to the Zr atom is disordered over two sites, as are two of the THF mol­ecules in the lithium moiety. All bond distances and angles are consistent with those in complexes with similar structural entities. The Zr—N bond distances are 2.2185 (18) and 2.167 (3) Å.     

Aquabromo(6‐carboxypyridine‐2‐carboxylato‐O,N,O′)mercury(II)

The title compound, [HgBr(C₇H₄NO₄)(H₂O)], was obtained by the reaction of an aqueous solution of mercury(II) bromide and pyridine‐2,6‐di­carboxylic acid (picolinic acid, dipicH₂). The shortest bond distances to Hg are Hg—Br 2.412 (1) Å and Hg—N 2.208 (5) Å; the corresponding N—Hg—Br angle of 169.6 (1)° corresponds to a slightly distorted linear coordination. There are also four longer Hg—O interactions, three from dipicH^? [2.425 (4) and 2.599 (4) Å within the asymmetric unit, and 2.837 (4) Å from a symmetry‐related mol­ecule] and one from the bonded water mol­ecule [2.634 (4) Å]. The effective coordination of Hg can thus be described as 2+4. The mol­ecules are connected to form double‐layer chains parallel to the y axis by strong O—H?O hydrogen bonds between carboxylic acid groups of neighbouring mol­ecules, and by weaker hydrogen bonds involving both H atoms of the water mol­ecule and the O atoms of the carboxylic acid groups.     

Dichloro­(O‐ethyl 3‐methyl­pyridine‐2‐carboximidic acid‐κ2N,N′)copper(II)

In the title compound, [CuCl₂(C₉H₁₂N₂O)], the Cu^II atom is coordinated by two Cl⁻ anions and two N atoms of one O‐ethyl 3‐methyl­pyridine‐2‐carboximidic acid mol­ecule in a slightly distorted square‐planar geometry, with Cu—N distances of 2.0483 (17) and 1.9404 (18) Å, and Cu—Cl distances of 2.2805 (10) and 2.2275 (14) Å. In addition, each Cu^II atom is connected by one Cl⁻ anion and the Cu^II atom from a neighbouring mol­ecule, with Cu⋯Cl and Cu⋯Cu distances of 2.9098 (13) and 3.4022 (12) Å, respectively, and, therefore, a centrosymmetric dimer is formed. Adjacent mol­ecular dimers are connected by π–π stacking inter­actions between pyridine rings to form a zigzag mol­ecular chain. The mol­ecular chains are also enforced by N—H⋯Cl and C—H⋯Cl inter­actions.     

Low‐dimensional compounds containing cyano groups. I. catena‐Poly[[[dicyanoargentato(I)‐κN]bis(4‐methylpyridine‐κN)copper(II)]‐μ‐dicyanoargentato(I)‐κ2N:N′]

The structure of the title compound, [Cu(C₆H₇N)₂{Ag(CN)₂}₂]_n, is made up of neutral zigzag chains of [–NC–Ag–CN–Cu(4‐Mepy)₂{Ag(CN)₂}–NC–Ag–CN–] (4‐Mepy is 4‐methyl­pyridine). Neighbouring chains are linked by weak argentophilic interactions, with Ag?Ag distances of 3.2322 (12) Å. The Cu atom, which lies on a twofold rotation axis, is pentacoordinated by one monodentate Ag(CN)₂^? anion [Cu—N 1.985 (3) Å], the atoms of which lie on the same rotation axis, and by bridging di­cyano­argentate anions [2 × Cu—N 2.0827 (19) Å], with Ag atoms on inversion centres. The coordination polyhedron is completed by two 4‐Mepy mol­ecules [2 × Cu—N 2.038 (2) Å], which occupy the axial positions of a distorted trigonal bipyramid.     

Chloro{2,2′‐[(1S,2S)‐1,2‐di­phenyl‐1,2‐ethanediyl­bis­(nitrilo­methyl­idyne)]­diphenolato‐κ4O,N,N′,O′}(ethanol‐κO)­manganese(III)

The crystal structure of the title compound, [MnCl(C₂₈H₂₂N₂O₂)(C₂H₆O)], has been determined at 173 (2) K in the non‐centrosymmetric space group P2₁2₁2₁. The asymmetric unit contains two molecular units. An intermolecular O—H⋯Cl hydrogen bond is formed between the OH group of an ethanol mol­ecule coordinated to the Mn atom and the coordinated Cl⁻ anion, and so polymeric chains of Mn‐containing fragments are formed [O—H⋯Cl = 3.1281 (16) and 3.1282 (15) Å]. The Mn atoms have a pseudo‐octahedral coordination sphere, with the four donor atoms of the Schiff base forming an equatorial plane [Mn—O distances are 1.8740 (13), 1.8717 (13), 1.8749 (13) and 1.8823 (13) Å, and Mn—N distances are 1.9868 (15), 1.9910 (14), 1.9828 (15) and 1.9979 (14) Å]. The axial positions are occupied by an ethanol mol­ecule [Mn—O distances of 2.3069 (15) and 2.3130 (15) Å] and a Cl⁻ ligand [Mn—Cl distances of 2.5732 (6) and 2.5509 (6) Å].     

catena‐Poly[[aqua­bis(1H‐benzimidazole‐κN3)manganese(II)]‐μ‐adipato]

In the title polymeric complex, [Mn(C₆H₈O₄)(C₇H₆N₂)₂(H₂O)]_n, the Mn^II atom is surrounded by two adipate dianions, two benzimidazole mol­ecules and one coordinated water mol­ecule. The Mn atoms and coordinated water mol­ecule are located on a twofold axis, and the bridging adipate ligand is located on an inversion center. The adipate dianions bridge neighboring Mn^II atoms to form polymeric chains. Each Mn^II atom is seven‐coordinate, the longest Mn—O bond length being 2.5356 (16) Å.     

Iodo­(picolinato‐κ2N,O)(picolinic acid‐κ2N,O)mercury(II)

The title compound, [Hg(C₆H₄NO₂)I(C₆H₅NO₂)], has twofold symmetry along the Hg—I bond. The Hg^II ion coordinates one I atom [at 2.6045 (4) Å], two N and two O atoms [at 2.298 (3) and 2.481 (2) Å] from one picolinate ion, and one picolinic acid mol­ecule in a very irregular trigonal–bipyramidal coordination. The single hydr­oxy H atom required for chemical neutrality is both statistically (by crystal symmetry) and structurally disordered, and is involved in an inter­molecular O—H⋯O hydrogen bond [O⋯O = 2.455 (4) Å], connecting the mol­ecules into one‐dimensional infinite chains along the [101] direction.     

Bis(μ‐diphenyl­phosphinato‐κ2O:O′)bis­[aqua­(diphenyl­phosphinato‐κO)bis­(pyridine‐κN)cobalt(II)]

In the centrosymmetric title compound, [Co₂(C₁₂H₁₀O₂P)₄(C₅H₅N)₄(H₂O)₂], each approximately octa­hedral Co atom features two trans‐coordinated pyridine mol­ecules, one water mol­ecule, a terminally coordinated monodentate diphenyl­phosphinate ligand, and two bidentate diphenyl­phosphinate ligands that bridge the two Co atoms across a centre of inversion to form a dimeric binuclear complex. The discrete mol­ecules are linked by double hydrogen bonds between the terminally coordinated diphenyl­phosphinate ligand and the water mol­ecule to form a continuous chain along the crystallographic b axis.     

Bis(μ‐pyridine‐2‐thiol­ato)‐κ4S:N;N:S‐bis­[(pyridine‐2‐thiol­ato‐κS)(2‐pyridyl­phen­yl‐κ2N,C2)platinum(III)](Pt—Pt): the non‐solvated and acetonitrile‐solvated forms

The title dinuclear platinum(III) complex, [Pt₂(C₁₁H₈N)₂(C₅H₄NS)₄], forms two crystal structures, viz. the non‐solvated and acetonitrile‐solvated (C₂H₃N) forms. For both forms, two (2‐pyridylphenyl)platinum units are bridged by two pyridine‐2‐thiol­ate (pyt) anions in a head‐to‐tail configuration, and the other two pyridine‐2‐thiol­ate anions occupy the axial position, coordinated through their S atoms. The most remarkable difference between the two forms is the orientation of the axial monodentate ligands. Those for the solvated form are located over the 2‐pyridylphenyl ligands, being related by a twofold axis which lies through the centre of the Pt—Pt bond, while the axial pyt ligands for the non‐solvated form are oriented irregularly, which is attributable to the dimeric arrangement in the crystal.     

catena‐Poly[[(1,10‐phenanthroline‐κ2N,N′)manganese(II)]‐di‐μ‐salicylato‐κ4O:O′]

In the title polymeric complex, [Mn(C₇H₅O₃)₂(C₁₂H₈N₂)]_n, the Mn^II atom is located on a twofold axis and displays a distorted octa­hedral coordination geometry, formed by four salicylate anions and one 1,10‐phenanthroline (phen) mol­ecule. The salicylate anions doubly bridge the Mn^II atoms to form one‐dimensional polymeric chains. A comparison of Mn—O bond distances with the corresponding Mn—O—C angles suggests a significant electrostatic content in the Mn—O bonds. A face‐to‐face distance of 3.352 (7) Å between neighbouring parallel phen planes indicates π–π stacking inter­actions between polymeric chains.     

A dinuclear CoII complex: bis(μ‐di­hydrogen phosphato‐κ2O:O′)­bis­[(bipyridine‐κ2N,N′)(di­hydrogen phosphato‐κO)­cobalt(II)]

The title compound, [Co₂(H₂PO₄)₄(C₁₀H₈N₂)₂], is dinuclear, centred on a symmetry centre of the P space group. Each Co atom has a distorted square‐pyramidal coordination involving two N atoms from a bi­pyridine mol­ecule and three O atoms from two bridging and one terminal di­hydrogen ortho­phosphate anion. The molecular structure and packing are stabilized by intermolecular hydrogen‐bond interactions.     

catena‐Poly[[[diaqua­bis(pyridine‐4‐carboxamide‐κN)copper(II)]‐μ2‐squarato‐κO1:O3] dihydrate]

The asymmetric unit of the title compound, {[Cu(C₄O₄)(C₆H₆N₂O)₂(H₂O)₂]·2H₂O}_n, consists of one pyridine‐4‐carbox­amide (isonicotinamide or ina) ligand, one‐half of a squarate dianion, a coordinated aqua ligand and a solvent water mol­ecule. Both the Cu^II and the squarate ions are located on inversion centers. The Cu^II ions are octa­hedrally surrounded by four O atoms of two water mol­ecules and two squarate anions, and by two N atoms of the isonicotinamide ligands. The crystal structure contains chains of squarate‐1,3‐bridged Cu^II ions. These chains are held together by N—H⋯O and O—H⋯O inter­molecular hydrogen‐bond inter­actions, forming an extensive three‐dimensional network.