Selected Bond Distances Research Articles

The isolation and molecular structure of trans-[PtCl(COCH 2CH 2Ph)(PPh 3) 2]·EtOH, an intermediate in the hydroformylation of styrene promoted by the cis-[PtCl 2(PPh 3) 2]/SnCl 2 catalytic system

The complex trans-[PtCl(COCH 2CH 2Ph)(PPh 3) 2]·EtOH ( 1) has been synthesized by treating cis-[PtCl 2(PPh 2] with styrene in EtOH at 100°C under 50 atm of carbon monoxide and of hydrogen. In combination with SnCl 2·2H 2O, complex 1 is an intermediate in the catalytic hydroformylation of styrene. The crystal structure of 1 has been determined by X-ray crystallography. The crystals are monoclinic, space group P2 1/ c, with a 10.95(1), b 33.16(1), c12.43(1) Å and β 109.59(3)°. The final R factor was 0.087 for 4772 observed reflexions. The platinum atom is in a slightly distorted square-planar environment. Selected bond distances are: PtP (mean) 2.31 Å, PtCl 2.427(6) Å.

ChemInform Abstract: Coordination Chemistry of 2‐Diethylphosphonato‐4,6‐dipiperidino‐1,3,5‐triazine with Uranyl Nitrate.

AbstractThe 1:2 molar reaction of UO2(NO3)2·6 H2O and the title ligand in ethanol gives the complex (I) (no yield given).

Coordination chemistry of 2-diethylphosphonato-4,6-dipiperidino-1,3,5-triazine with uranyl nitrate

The known ligand, 2-diethylphosphonato-4,6-dipiperidino-1,3,5-triazine has been prepared and the crystal and molecular structure determined by single crystal X-ray diffraction techniques. The molecule crystallized (−30°C) in the monoclinic space group P 1 (No. 2) with a = 8.698(3), b = 10.064(4), c = 12.798(5) Å, α = 67.34(3), β = 77.08(3), γ = 68.01(3)°, Z = 2, V = 954.5(6) Å 3 and ϱ calc = 1.33 g cm −3. The structure was solved by direct methods and blocked least-squares refinement converged to R F = 4.9% and R w F = 5.2% on 295 variables and 2995 unique reflections with F> 3σ( F). Selected bond distances for the ligand include: PC(1) 1.834(2) Å, PO 1.452(2) Å and CN(ring) avg 1.343(3) Å. The complex UO 2(NO 3) 2- {C 3N 3(C 5H 10N) 2[(EtO) 2P(O)]} 2 was obtained from a mixture of UO 2(NO 3) 2·6H 2O and the ligand in a 1:2 ratio and characterized by spectroscopic methods. The crystal and molecular structure of the compound was determined by single crystal X-ray diffraction methods. The molecule crystallized (20°C) in the monoclinic space group P 1 (No. 2) with a = 10.050(2), b = 10.628(2), c = 12.464(2) Å, α = 73.96(1), β = 70.25(1), γ = 75.32(3)°, Z = 1, V = 1185.2(3) Å 3, and ϱ calc=1.63 g cm −3. The structure was solved by heavy atom methods and blocked least squares refinements converged to R F = 3.4% and R w F = 3.6% on 286 variables and 5271 unique reflections with F> 3σ( F). The complex contains a linear UO 2 2+ group bonded to two bidentate nitrate ions and the phosphoryl groups of two trans situated phosphonate ligands. Several important bond distances include: UO 1.764(5) Å, UO(phosphoryl) 2.381(3) Å, UO(nitrate) avg=2.514(3) Å, PO 1.472(4) Å, PC(1) 1.817(4) Å, CN(ring) avg 1.337(6) Å.

Synthesis, Thermal, Magnetic Properties and Crystal Structure of Homodinuclear Copper(II) Complexes with New `End-off' Compartmental Schiff Bases

The homodinuclear copper(II) complex Na 2 [Cu 2- L c(OH)(H 2O) 2]·11H 2O (H 5L c is the Schiff base derived from the condensation of 2,6-diformyl-4- chlorophenol and ( + )1-aminoethanephosphonic acid in a 1:2 molar ratio) has been prepared and characterized by IR, UV data, scanning electron microprobe analysis and X-ray diffraction. The crystal structure of Na 2 [Cu 2L c(OH)(H 2O) 2]·11H 2O has been determined by X-ray crystallography and refined to the final R of 0.032. The compound is triclinic, space group P 1 , with a = 17.129(5), b = 11.558(5), c = 8.372(5) Å, α = 95.95(3), β = 104.72(3), and γ = 76.21(3)°; Z = 2. The compound is a dinuclear complex in which the copper ions are five-coordinate square pyramidal. One oxygen atom from the pentadentate pentaanionic ligand and the OH −oxygen provide bridging of the metal ions. Two water molecules are in the apical positions. The sodium ions are octahedrally surrounded by oxygen atoms from water and phosphonate groups. Selected bond distances are: CuO(base) 1.92 to 1.98 Å; CuN 1.97 Å; CuO- (axial) 2.51 and 2.28 Å; Na-O(water) 2.38 to 2.50 Å; NaO(phosphonate) 2.57 Å. The crystal lattice is stabilized by an extensive network of hydrogen bonds. The thermal and magnetic behaviour over 68–290 K temperature range are reported together with a comparison with the analogous homodinuclear copper(II) complex with the ligand H 3L A (H 3L A is the Schiff base derived from the condensation of 2,6- diformyl-4-chlorophenol and aminomethanesulphonic acid in a 1:2 molar ratio). The two copper(II)ions exhibit a significant antiferromagnetic interaction ( J = −202.5 cm −1).

Reactivity of rhenium(I) pseudo-allyl complexes with heterocumulenes. Part 2. Insertion reactions. Crystal structures of the thiazolyl-thioureido and -dithiocarbamato complexes [Re(CO)2(PPh3)2{SC(NPh)NMe(C3H2NS)}]·CH2Cl2and [Re(CO)2(PPh3)2{S2CNMe(C3H2NS)]·CH2Cl2(C3H2NS = thiazol-2-yl)

The compound [Re(CO)2(PPh3)2(mat)][mat = anion of 2-(methylamino)thiazole] reacts under anhydrous conditions with an excess of PhNCS or CS2 to give the thioureido rhenium(I) derivative [Re(CO)2(PPh3)2{SC(NPh)NMe(C3H2NS)}](1) and the dithiocarbamate rhenium(I) complex [Re(CO)2(PPh3)2{S2CNMe(C3H2NS)}](2) respectively (C3H2NS = thiazol-2-yl). They are obtained by formal insertion of the heterocumulene into the Re–N bond. Compound (1) is triclinic, space group P, with a= 15.058(6), b= 14.305(6), c= 12.371(6)A, α= 108.51(3), β= 75.16(3), γ= 104.91(3)° and Z= 2. The structure was refined to the final conventional R of 0.055. The rhenium atom is six-co-ordinate distorted octahedral. The organic ligand chelates through the nitrogen atom of the thiazole ring and the sulphur atom of the PhNCS moiety, and together with the metal forms a non-planar six-membered ring. Selected bond distances are: Re–P 2.436 (mean), Re–C 1.89 (mean), Re–N 2.20(1), Re–S 2.471(3)A. Compound (2) is monoclinic, space group P21/n, with a= 21.305(5), b= 17.873(5), c= 11.455(7)A, β= 97.81(3)°, and Z= 4. The structure was refined to the conventional R of 0.052. The rhenium atom is six-co-ordinate distorted octahedral. The organic ligand chelates through the two sulphur atoms of the CS2 moiety and together with the metal forms a planar four-membered ring. Selected bond distances are: Re-P 2.431 (mean), Re–S 2.513 (mean), and Re–C 1.88 A(mean).

The chemistry of heteroallene and heteroallyl derivatives of rhenium. Part 1. Reactivity of mixed carbonyl(formamido)(phosphine)rhenium(I) complexes with RNCS (R = Ph or p-MeC6H4) and PhNCO. Crystal structure of the thiazetidine rhenium(I) complex [Re(CO)2(PPh3)2{PhNC(OEt)–S}

The formamido rhenium(I) compound [Re(CO)2(PPh3)2(OCHNC6H4Me-p)] reacts in anhydrous benzene with an excess of PhNCS to give, after treatment with EtOH, the thioureido derivative [Re(CO)2(PPh3)2{PhNC[N(C6H4Me-p)CHO]S}] obtained by formal insertion of the heterocumulene molecule into the Re–N bond, and also the new thiazetidine rhenium(I) derivative [Re(CO)2(PPh3)2{PhNC(OEt)–S}]. The crystal structure of the latter complex was determined by X-ray crystallography. The compound is monoclinic, space group P21/n, with a= 15.563(5), b= 19.156(4), c= 15.139(5)A, β= 97.66(3)°, and Z= 4. The structure was refined to R= 0.054 for 5 886 independent reflections. The Re atom has distorted octahedral co-ordination. Selected bond distances are: Re–P 1.420 (mean), Re–S 2.548(4), Re–N 2.20(1), and Re–C 1.86 A(mean).

Transition metal complexes with ‘end-off’ compartmental Schiff bases containing sulphonic or phosphonic groups

Nickel(II), manganese(II) and copper(II) complexes with ‘end-off’ compartmental ligands derived from 2,6-diformyl-4-chlorophenol and α or β-amino-sulphonic or aminophosphonic acids, have been prepared. The mono- and homobinuclear complexes, obtained by template or step by step procedures, have been characterized by IR, UV, scanning electron microprobe analysis and magnetic susceptibility measurements. The electrochemical behaviour of some complexes has been also examined. The crystal structure of {[Cu 2(C 10H 8ClN 2O 7S 2)(OH)](DMSO(H 2O)} 2 has been determined by X-ray crystallography. The compound is orthorhombic, space group Pbca, with a=17.071(5), b=11.751(5), c=20.464(4) Å, Z=4. The molecule of the compound is centrosymmetric. One five-coordinate square pyramidal and one four-coordinate square planar copper atom are present in the asymmetric unit, and the four coordinate copper also makes a contact of 2.58 Å with a DMSO molecule. Selected bond distances are: CuO (bridging) 1.95 Å (mean), CuO (base) 2.00 Å, CuN (base) 1.96 Å (mean), CuO (axial) 2.25 Å. The organic ligand is pentadentate; the hydroxo oxygen atom is bridging two copper atoms of the same asymmetric unit and is axially bonded to one copper atom of the centrosymmetric unit. The clathrate water molecules are hydrogen bonded to the compound.

The chemistry of heteroallene and heteroallyl derivatives of rhenium. Part 2. Reactivity of [ReO(OR)Cl2(PPh3)2](R = Me or Et) with RNCS (R = Ph or p-MeC6H4). Crystal structure of the thiazetidine rhenium(V) complex [ReOCl2(PPh3){p-MeC6H4NC(OEt)–S}

The complex [ReO(OR)Cl2(PPh3)2](R = Me or Et) reacts with an excess of RNCS (R = Ph or p-MeC6H4) to give the thiazetidine complexes [ReOCl2(PPh3){RNC(OR)–S}] obtained by formal insertion of the heterocumulene molecule into the Re–OR bond. The crystal structure of the complex [ReOCl2(PPh3){p-MeC6H4NC(OEt)–S}] was determined by X-ray crystallography. The compound is triclinic, space group P with a= 12.991(5), b= 11.394(5), c= 10.024(5)A, α= 93.53(3), β= 100.29(3), γ= 77.74(3)°, and Z= 2. The structure was refined to R= 0.035 for 4 626 independent reflections. The Re atom is six-co-ordinate distorted octahedral. The organic ligand is chelated through the nitrogen and sulphur atoms and makes with the metal a roughly planar four-membered ring. Selected bond distances are: Re–O 1.671(4), Re–P 2.488(2), Re–Cl 2.381(2) and 2.437(2), Re–N 2.087(5), and Re–S 2.406(2)A.

Preparation, characterization and crystal structure of a binuclear thorium(IV) complex with a pentadentate compartmental Schiff Base

The interaction of the potentially pentadentate compartmental Schiff base, (H 3L), derived by condensation of 2,6-diformyl-4-chlorophenol and o- aminophenol with thorium(IV) salts has been studied and the crystal structure of the ionic complex [Mg[Th 2L 3] 2·6H 2O determined by X-ray crystallography. The compound is monoclinic, space group P2 1/ c, with a=12.488(6), b=22.044(5), c=24.316(5) Å, and β=104.82(3)°; D c=1.66 g cm t-3 for Z= 2. The structure was refined to the final conventional R of 0.067 based on 5455 observed reflexions. The two independent Th atoms of the monoanionic [Th 2L 3] − complex are nona-coordinate and bridged by three oxygen atoms. The Mg 2+ cations, which are on crystallographic centres of symmetry, are octahedrally surrounded by H 2O molecules. Selected bond distances are: ThO (bridging) 2.47 Å (mean value), ThO 2.31 Å (mean value), ThN 2.74 ) Å (mean value), MgṫO 2.09 Å (mean value).

Preparation and properties of lanthanide complexes with pyridine-2,6-dicarboxylic and thiophene-2,5-dicarboxylic acids. Crystal structure of diaqua-bis(dipicolinate)lanthanum(III) tetrahydrate

Lanthanum(III), gadolinium(III) and dysprosium- (III) complexes with pyridine-2,6-dicarboxylic acid (H 2pdc) of composition Na 3[Ln(pdc) 3]· nH 2O and Ln(pdc)(Hpdc)· mH 2O (n = 5−10; m = 5−8) have been prepared by reaction of aqueous solutions of Ln(NO 3) 3· nH 2O and H 2pdc in the presence of NaOH and their physico-chemical properties studied. The thermal behaviour of Ln(pdc)(Hpdc)· mH 2O has been investigated and the structure of La(pdc)(Hpdc)· 6H 2O determined by X-ray crystallography. The compound is monoclinic, space group P2 1/ c, with a = 14.120(5), b = 11.280(5), c = 13.038(5) Å, β = 101.67(3)°, and Z = 4. Refincment of the structure based on the 3217 observed reflexions led to the final R of 0.026. The asymmetric complex unit comprises the nine-coordinate metal ion, two dipicolinato ligands and two coordinated water molecules. One dipicolinato group provides linkage with a carboxylate oxygen, allowing the formation of a polymeric chain. Selected bond distances are LaN 2.67 ) Å, LaO (water) 2.51 Å (mean), LaO (pdc) 2.55 Å (mean). The interaction of thiophene-2, 5-dicarboxylic acid (H 2tdc) with Ln(NO 3) 3· nH 2O (Ln = La, Gd, Dy; n = 6, 5, 4) has also been studied; there is a marked difference in the complexes obtained and consequently in the coordination ability of H 2tdc towards lanthanide with respect to H 2pdc.

Dioxouranium(Vl) complexes with pentadentate bases containing acetal groups

The new ligands [(OCH 3) 2CHHOC 6H 2ClCH N(CH 2) 2] 2NH, H 2(NAC), and [(OCH 3) 2CHHOC 6 H 2ClCHN(CH 2) 2] 2S, H 2(SAC), and the related uranyl complexes [UO 2(NAC)] and [UO 2(SAC)] have been prepared and characterized by infrared, 1H and 13C NMR and electronic spectroscopy. Thermogravimetric and mass spectrometry data are also reported. The crystal structures of the complexes have been determined by X-ray crystallography. [UO 2(SAC)] is monoclinic, space group P2 1/ n, with a = 20.591(5), b = 11.948(8), c = 11.780(8) Å, β = 90.11(3)°; D c = 1.86 g cm −3 for Z = 4. The structure was refined to the conventional R of 4.6%. [UO 2(NAC)] is tetragonal, space group P4 12 12, with a = 12.605(8) and c = 17.801(5) Å; D c = 1.87 g cm −3 for Z = 4. The structure was refined to the conventional R of 5.7%. In both compounds the pentadentate dianionic ligand binds equatorially to UO 2 2+ leading to seven-coordinated uranium in a distorted bipyramidal coordination geometry. Selected bond distances for [UO 2(SAC)] are: UO (uranyl) 1.77 Å (mean), UO (ligand) 2.22 Å (mean), UN 2.61 Å, (mean) and US 3.003(3) Å. In [UO 2- (NAC)] the corresponding values are: UO (uranyl) 1.72 Å, UO (ligand) 2.21 Å (mean), UN 2.56 Å, and UNH 2.60 Å.

Structure of [(.eta.-C5H5)Fe(CO)2(CS)]PF6, a comparison of metal-thiocarbonyl and metal-carbonyl bonding

The complex ((eta-C/sub 5/H/sub 5/)Fe(CO)/sub 2/(CS))PF/sub 6/ was prepared, crystallized, and its structure determined by x-ray crystallographic analysis. The atomic coordinates, isotropic thermal parameters and selected bond distances and angles are tabulated. The structure of the complex was shown to be composed of discrete cationic ((C/sub 5/H/sub 5/Fe(CO)/sub 2/(CS)/sup +/) and anionic (PF/sub 6//sup -/) species, and the coordination of the iron was found to be octahedral. 23 references, 1 figure, 4 tables.

Synthesis, characterization and crystal structure of 2-dimethylacetal-4-chloro-6-formylphenol and aquabis(2-dimethylacetal-4-chloro-6-formylphenolato)dioxouranium(VI)

The ligand 2-dimethylacetal-4-chloro-6-formylphenol, H(ALAC), prepared by boiling 2,6-diformyl-4-chlorophenol, H(DIAL), in methanol, was reacted with uranyl acetate to obtain the complex [UO 2(ALAC) 2(H 2O)]. The ligand and the uranyl complex were characterized by X-ray crystallography, infrared, 1H NMR and electronic spectroscopy. Thermogravimetric and mass spectrometry data are also reported. In acid media H(ALAC) transforms easily into H(DIAL). H(ALAC) is monoclinic, P2 1/ n, with a=13.951(5), b=7.902(5), c=9.465(5) Å, β= 91.33(3)°. The structure was refined to R=3.9%, based on 1657 observed reflexions. [UO 2(ALAC) 2(H 2O)] is tetragonal, P4 32 12, with a=11.147(5) and c=19.150(4) Å. The structure was refined to R=4.0%, based on 2938 observed reflexions. Four ligand oxygens and one water molecule are equatorially bonded to the uranyl group in this compound. Uranium and water oxygen lie in special positions on a crystallographic twofold axis so that the two halves of this molecule are symmetrically related. Selected bond distances for [UO 2(ALAC) 2(H 2O)] are: UO (charged) 2.28(2) Å, UO (neutral) 2.45(2) Å, UO (uranyl) 1.77(2) Å, UO (water) 2.44(4) Å.

Crystal structure ofcis-diaqua bis(2,2?-bipyridyl)chromium(III) nitrate, [Cr(bipy)2(H2O)2] (NO3)3

cis-Diaquabis(2,2′-bipyridyl)chromium(III) nitrate crystallizes in the mono-clinic system, space groupP21/c, witha=16.102(6),b=10.792(5),c=15.076(6) A,β=112.90(5)°, andZ=4. The saltlike structure was determined from X-ray crystallography and refined toR=7.5% for 3342 observed reflections. The Cr atom is octahedrally surrounded by twocis water molecules and by two chelated 2,2′-bypiridyl ligands forming two nearly orthogonal planes. Selected bond distances are: Cr-O, 2.00(1) and 1.98(1) A, Cr-N, 2.04 A (mean).

Preparation, properties, crystal and molecular structure of uranyl(VI) complexes with a new cyclic schiff base compartmental ligand

Some uranyl(VI) complexes with new acyclic and cyclic Schiff base compartmental ligands have been prepared and characterized. The ligands have been obtained by reaction of 4-chloro-2,6-diformylphenol and polyamines of the type NH 2(CH 2) 2X (CH 2) 2NH 2 (X= NH, S). The structure of the uranyl(VI) complex with the ligand 1,7,15,21-tetra- aza-4,18-dithia-11,25-dichloro 8,22-bis- metadiphenyl cyclophane-gb-7,14,21,28 has been determined by X-ray crystallography. The compound crystallizes in the orthorhombic space group Pbca with eight formula units in a cell of dimensions a = 26.654(3), b = 22.871(3), c = 8.875(5) Å. The structure was solved by standard methods and refined by full- matrix least squares to the conventional R index of 4.6% for 2678 independent observed reflexions. Five donor atoms (including sulphur) of the ligand are equatorially bonded to the uranyl group to form discrete monomeric molecules with the seven-coordinated metal in the usual distorted pentagonal bipyramidal coordination geometry. Selected bond distances are: UO (equatorial), 2.22(1) and 2.25(1) Å; UN, 2.60(1) and 2.59(1) Å; US, 3.018(4) Å.

The crystal and molecular structure of a dinuclear copper(II) complex of a Robson-type macrocycle, [Cu2(C26H30N4O2)(H2O)2](BF4)2

The crystal structure of the dinuclear complex [Cu2(C26H30-N4O2)(H2O)2](BF4)2 was determined by x-ray crystallography. The crystals are triclinic, P¯1, witha = 10.945(5),b = 8.703(5),c = 8.495(5) A, α = 103.86(3)°, β = 105.73(3)°, γ = 85.77(3)°, V = 756 A3 Dc = 1.65 g cm−3 for Z = 1. The copper(II) atoms are 5-coordinate and square-pyramidal. Selected bond distances are: Cu-N, 1.91 A (mean); Cu-O(base) = 1.90(1) and 1.91(1) A; Cu-O(apical) = 2.47(1) A; There are O(water)-H ... F interionic hydrogen bonds in the structure. The Cu .. Cu distance is 2.847 A.

ChemInform Abstract: REACTIONS OF PERTECHNETATE ANION WITH TRIPHENYLPHOSPHINE. MOLECULAR STRUCTURE (AT ‐100°C) OF (1,1‐DIMETHYL‐3‐OXOBUTYL)TRIPHENYLPHOSPHONIUM PENTACHLORO(TRIPHENYLPHOSPHINE)TECHNETATE(IV)

AbstractDas Ion [TcO4]′ reagiert mit PPh3 im Verhältnis 1 :7 und HCl in stöchiometrischem Verhältnis bzw. mit PPh3 im Verhältnis 1 : l0 und HCl (1:100) in Me, CO bei Raumtemp. zu den Komplexen (I) bzw. (II).

Reactions of pertechnetate anion with triphenylphosphine. Molecular structure (at –100 °C) of (1,1-dimethyl-3-oxobutyl)triphenylphosphonium pentachloro(triphenylphosphine)technetate(IV)

The reactions of the [TcO4]– anion with PPh3 in various concentrations of HCl are reported. [TcCl4(PPh3)2], [TcCl5(PPh3)]–, and [TcCl6]2– were obtained and the anionic complexes were isolated with cations such as [PPh3H]+, [AsPh4]+, or [Ph3PC(Me)2CH2COMe]+. The crystal structure of the title complex was determined at –100 °C from 1 761 independent reflections and refined to R= 0.065. Crystals are monoclinic, space group P21/n, a= 21.909(4), b= 18.963(4), c= 9.896(3)A, β= 103.05(5)°, and Z= 4. The structure consists of well separated units of octahedral [TcCl5(PPh3)]– anions, and tetrahedral phosphonium cations, in which the phenyl groups are in a ′ propeller ′ configuration around P. Selected bond distances and angles are Tc–Cl (mean) 2.34(1), Tc–P 2.57(1)A, Cl–Tc–Cl (mean) 90.7(4), Cl–Tc–P 88.7(4)°.

Structural studies of Fe(III) and Cu(II) complexes of salycylaldehyde benzoyl hydrazone, a synthetic chelating agent exhibiting diverse biological properties

Salicylaldehyde benzoyl hydrazone (SBH) is a Schiff base that can function as a tridentate chelating agent [l-3]. Some thirty years ago, it was shown that this compound has modest bacteriostatic properties when tested in vitro against microorganisms such as Mycobacten’um tuberculosis, Mycobacterium smegmatis, Candida albicans and Aspergillus niger, although these effects were not sufficiently marked to encourage further study at that time [4, 51. Recently, however, interest in the biological properties of SBH has been renewed with the recognrtion that aroylhydrazones of this type are able to induce iron excretion in mammals and thus are potentially of use in the treatment of iron overload on man [6, 71. SBH itself can mobilize iron from iron-loaded reticulocytes in vitro [8] and produces high levels of iron excretion when administered to rats [9] . preliminary studies have also shown that SBH is an unusually potent inhibitor of DNA synthesis in a variety of cultured human and rodent cells and that the complex [CuCl(SBH)]*H,O produces significant inhibition of tumor growth when given to mice bearing a transplanted fibrosarcoma [lo-121. The common mechanism underlying these various biological effects of SBH appears to be an ability to penetrate cell membranes and disrupt the intracellular metabolism of essential metal ions. The exact nature of such disruptions, and the extent to which they may be exploited for therapeutic purposes, require much additional study, including detailed elucidation of the chemical properties of complexes formed between SBH and physiologically-important transition metals. This paper reports single crystal X-ray diffraction studies of two such complexes, [FeCla(SBH)(CHsOH)] and [CuCl(SBH)]~H,O. TABLE I. Selected Bond Distances, in A.