Synthesis and Crystal Structure of (18-Crown-6)(nitrato)(triphenylphosphine oxide)potassium

A new complex (18-crown-6)(nitrato)(triphenylphosphine oxide)potassium (I) is synthesized, and its crystal structure is studied by X-ray diffraction analysis (space group R3m, a = 14.336 Å, c = 13.776 Å, Z = 3). The structure is solved by the direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.034 for 1122 independent reflections (CAD4 automated diffractometer, λ MoK_α radiation). Structure I contains a complex host-guest molecule [K(NO₃)(18-crown-6)(Ph₃PO)] with crystallographic symmetry 3m (three planes m contain three Ph rings of the Ph₃PO ligand and all O atoms of the crown ligand). The coordination polyhedron of the K⁺ cation is a distorted hexagonal bipyramid with all the six O atoms of the crown ligand in the base, the O atoms of the Ph₃PO ligand, and one (or two) O atoms of a disordered NO ₃ ^? ligand in the axial positions.     

Ammonium (18-Crown-6)(Triphenylphosphine Oxide) Perchlorate: Synthesis and Crystal Structure

A new compound, ammonium (18-crown-6)(triphenylphosphine oxide) perchlorate (I), is synthesized, and its crystal structure is studied using X-ray diffraction analysis (space group R3m, a = 14.432 Å, c = 14.034 Å, Z = 3, direct method, full-matrix least-squares method in the anisotropic approximation, R = 0.064 for 1945 independent reflections, CAD4 automated diffractometer, λMoKα radiation). In the structure, the NH ₄ ⁺ cation resides in the 18-crown-6 macrocycle cavity and is hydrogen-bonded with three symmetrically equivalent O atoms of the 18-crown-6 molecule and with the phosphoryl O atom of the Ph₃PO molecule. The P=O H-N and Cl atoms occupy the partial position 3m. The oxygen atoms of the ClO ₄ ^? anion are disordered over the 3m position.     

Tetrakis(isothiocyanato)manganese(II) bis[aqua(18-crown-6)potassium] (18-crown-6)(thiocyanato)potassium

A new complex compound, i.e., tetrakis(isothiocyanato)manganese(II) bis[aqua(18-crown-6)potassium] (18-crown-6)(thiocyanato)potassium, was synthesized and its crystal structure was studied by X-ray diffraction (space group P2₁/m, a = 13.377, b = 14.690, c = 17.499 Å, β = 108.96°, Z = 2) and refined by the least-squares method in anisotropic approximation to R = 0.060 for 4715 independent reflections (CAD-4 automated diffractometer, λMoK _α). In the crystal, infinite chains are formed through the coordination bonds between its components. The monomer fragment of a chain [Mn(NCS)₅K₃(18-crown-6)₃(H₂O)₂] lies in plane m; three of the five SCN^? ligands and one of the two water molecules behave as bridges. The [Mn(NCS)₄]^2? anion has the tetrahedral structure. The coordination polyhedron of each of the three K⁺ cations is a distorted hexagonal bipyramid with six O atom of the corresponding crown ligand in a base. Three 18-crown-6 ligands have standard crown conformation.     

Synthesis and crystal structure of 18-crown-6 <Emphasis Type="Italic">E</Emphasis>-2-phenylethenylphosphonic acid diaqua(18-crown-6)sodium <Emphasis Type="Italic">E</Emphasis>-2-phenylethenylphosphonate

New complex compound, diaqua(18-crown-6)sodium E-2-phenylethenylphosphonate 18-crown-6 E-2-phenylethenylphosphonic acid, [Na(18-crown-6)(H₂O)₂]⁺·HO ₃ ^? PCH=CHPh·18-crown-6·H₂O₃PCH=CHPh, was obtained and its crystal and molecular structures were studied by the X-ray structural analysis. In this structure the complex cation [Na(18-crown-6)(H₂O)₂]⁺ is of guest-host type. The coordination polyhedron of its Na⁺ cation is a slightly screwed hexagonal bipyramid with the base consisting of all 6 O atoms of 18-crown-6 ligand and with two opposite apexes at two O atoms of two ligand water molecules. In the studied crystal structure the alternating complex cations and 18-crown-6 molecules as well as the molecules of acid and its anion HO ₃ ^? PCH=CHPh form by means of hydrogen bonds the infinite chains of two different types.     

(18-Crown-6)(nitrato-<Emphasis Type="Italic">O,O</Emphasis>′)potassium and (18-crown-6)(nitrato-O,O′)potassium<Subscript>(0.91)</Subscript>silver<Subscript>(0.09)</Subscript>: Synthesis and crystal structures

Two complexes with similar compositions are synthesized: (18-crown-6)(nitrato-O,O′)potassium (I) and (18-crown-6)(nitrato-O,O′)potassium_(0.91)silver_(0.09) (II). Their isomorphic orthorhombic crystals (space group P2₁2₁2₁, Z = 4) are studied by X-ray diffraction analysis. Structure I (a = 8.553 Å, b = 11.967 Å, c = 17.871 Å) and structure II (a = 8.540 Å, b = 11.956 Å, c = 17.867 Å) are solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.044 (I) and 0.055 (II) for all 2385 (I) and 2379 (II) measured independent reflections. Complex molecules [K(NO₃)(18-crown-6)] in structure I and [K_0.91Ag_0.09(NO₃)(18-crown-6)] in compound II are of the host-guest type and rather similar in structure. Their 18-crown-6 and NO ₃ ^? ligands are disordered over two orientations. The K⁺ cation in complex I and the mixed cation (K_0.91Ag_0.09)⁺ in complex II reside in the cavity of the disordered 18-crown-6 ligand and is coordinated by its six O atoms and by two disordered O atoms of the NO ₃ ^? . ligand. The coordination polyhedron (CN = 8) of the K⁺ cation in complex I and that of (K_0.91Ag_0.09)⁺ cation in complex II is a distorted hexagonal pyramid with a base of six O atoms of the 18-crown-6 ligand and a split vertex at two O atoms of the NO ₃ ^? ligand.     

The first example of a complex of N-perfluoroarylated azacrown ether: The crystal structure of diaqua{<Emphasis Type="Italic">N,N′</Emphasis>-bis(tetrafluoropyridyl)diaza-18-crown-6}lead(II) perchlorate

Complex formation of lead(II) perchlorate with N,N′-diaryldiaza-18-crown-6 (aryl = C₆H₅, 4-MeOC₆H₄, 4-C₅F₄N) has been studied. The stability of the complexes decreases with an increase in the electron-withdrawing character of the aryl substituent in the series (logβ, methanol): 4-MeOC₆H₄ (4.7), C₆H₅ (2.7), 4-C₅F₄N (<0 in methanol, 0.9 in acetone-d ₆). The dihydrate complex of lead(II) perchlorate with N,N′-bis(tetrafluoropyridyl)diaza-18-crown-6 (L) [Pb(L)(H₂O)₂](ClO₄)₂ has been studied by X-ray crystallography. The crystals are monoclinic, a = 9.260(2) Å, b = 16.986(2) Å, c = 21.620(3) Å, β = 96.01(2)°, V = 3381.9(9) ų, Z = 4, space group P2₁/n, R = 0.0449 for 5126 reflections with I > 2σ(I). In the complex cation [Pb(L)(H₂O)₂]²⁺, the coordination geometry of the metal atom is determined by partial delocalization of the lone pair. The Pb atom is asymmetrically bound to four oxygen atoms of substituted diaza-18-crown-6 and two oxygen atoms of water molecules (Pb-O, 2.450–2.726 Å). The CN of the metal atom is completed to ten by two nitrogen atoms of the macrocycle and two ortho fluorine atoms of two tetrafluoropyridyl substituents of the ligand L at longer distances (Pb-N, 2.978 and 3.108 Å; Pb-F, 2.890 and 3.123 Å).     

Syntheses and crystal structures of hydrated complexes of strontium and barium bromides with 18-crown-6

Two complexes, namely, triaqua(18-crown-6)strontium dibromide monohydrate (I) and diaquabromo(18-crown-6)barium bromide (II), are synthesized. Their crystal structures are determined by X-ray diffraction analyses. For complex I, space group C2/c, a = 17.547 Å, b = 10.246 Å, c = 14.786 Å, β = 123.08°, Z = 4. For complex II, space group Pnma, a = 17.753 Å, b = 17.465 Å, c = 6.629 Å, Z = 4. The structures are solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.056 (I) and 0.042 (II) for 2696 (I) and 2440 (II) independent reflections (CAD-4 automated diffractometer, λMoK _α radiation). Both complex cations—randomly disordered [Sr(18C6)(H₂O)₃]²⁺ in complex I and [BaBr(18C6)(H₂O)₂]⁺ in complex II—are of the host-guest type. The Sr²⁺ (Ba²⁺) cation resides in the cavity of the 18-crown-6 ligand and coordinated by all six O atoms. In the structures complexes I and II, the coordination polyhedra of the Sr²⁺ and Ba²⁺ cations (coordination number 9) can be described as distorted hexagonal bipyramids with one apex at the O atom of the water molecule in complex I or at the Br^? ligand in complex II and the other split apex at the O atoms of two water molecules.     

Synthesis,crystal structure,and vibrational spectrum of lithium <Emphasis Type="Italic">N</Emphasis>-(4′-benzo-15-crown-5)-5-bromo-2-hydroxyphenylaldiminatozinc perchlorate dihydrate

The synthesis, the IR absorption spectrum, and X-ray diffraction analysis of the complex [ZnLi(L¹)₂(H₂O)](ClO₄) · H₂O (I) (HL¹ = N-(4′-benzo-15-crown-5)-5-bromo-2-hydroxyphenylaldimine) are described. The crystals of I are monoclinic, a = 19.840(4) Å, b = 13.947(3) Å, c = 19.956(4) Å, β = 117.06(3)°, V = 4917.4(17) ų, Z = 4, space group P2₁/n, R = 0.0609 for 1409 reflections with I > 2σ(I). In the complex cation [ZnLi(L¹)₂(H₂O)]⁺, the Zn atom is bound to a distorted tetrahedral array of two N atoms (av. Zn-N, 2.027(10) Å) and two O atoms (av. Zn-O, 1.8968(8) Å) of two deprotonated L¹ ligands. The Li atom linked to the five ether oxygen atoms (av. Li-O_ether, 2.254(3) Å) sits atop the benzo-15-crown-5 (B15C5) macrocyclic plane of one coordinated L¹ ligand. The Li coordination is completed by water oxygen (Li-O(w1), 1.83(5) Å). The B15C5 cavity of the second coordinated ligand L¹ is vacant.     

Synthesis and crystal structure of (dibenzo-18-crown-6)(iodo)(trichlorometane)potassium

A new complex compound (dibenzo-18-crown-6)(iodo)(trichlorometane)potassium was obtained. Its crystal structure was studied by X-ray structural analysis. The complex molecule is built by the “guest-host” type: its K⁺ cation is in the crown ligand hollow and is coordinated via its all six O atoms, and also via the iodine ligand I and one Cl atom of the ligand CHCl₃ molecule. The coordination polyhedron of this K⁺ cation is a slightly distorted hexagonal bipyramid. In the crystal structure the complex molecules are connected in infinite chains by intercomplex hydrogen bonds Cl₃C-H?I ⁱ between the ligand molecule CHCl₃ and the iodine ligand of a neighboring complex molecule.     

Synthesis and crystal structure of bis(μ-periodato-<Emphasis Type="Italic">O,O′,O″</Emphasis>)bis(18-crown-6)dirubidium

A new binuclear complex, bis(μ-periodato-O,O′,O″)bis(18-crown-6)dirubidium [Rb₂(IO₄)₂(18-crown-6)₂] (I), is synthesized. Its crystal structure is studied by single-crystal X-ray diffraction analysis (space group P2₁/n, a = 11.942 Å, b = 8.394 Å, c = 19.664 Å, β = 101.08°, Z = 4, direct method, anisotropic full-matrix least-squares approximation, R = 0.030 for 2823 independent reflections, CAD-4 automated diffractometer, λMoK _α radiation). Complex I is binuclear and centrosymmetric, consisting of two cationic monomers [Rb(18-crown-6)]⁺ of the host-guest type linked through two tridentate IO ₄ ^? bridging ligands. The coordination polyhedron of the Rb⁺ cation (coordination number 9) can be described as a distorted hexagonal pyramid with a base of six O atoms of one 18-crown-6 ligand and one threefold vertex at three O atoms of the two IO ₄ ^? bridging ligands. The 18-crown-6 ligand has a usual crown conformation.     

Aquabis(dibenzo-18-crown-6)(tetrabromocuprato(II))dipotassium: Synthesis and crystal structure

The novel complex [K(Db18C6)(H₂O)]⁺[K(Db1)] ⁺(CuBr₄)^2? (I) was obtained. Its crystal structure (space group P2₁/c, a = 17.970 Å, b = 29.838 Å, c = 9.074 Å, β = 103.11°, Z = 4) was studied by X-ray diffraction analysis, solved by the direct method, and refined by the least-squares method in the anisotropic approximation to R = 0.098 from 6220 independent reflections (CAD-4 automated diffractometer, λMo Kα). In both “guest-host” complex ions, the K⁺ cation is in the cavity of the crown ligand Db18C6 and is coordinated by all its O atoms, as well as by a Br atom of the complex anion [CuBr₄]^2? or the water O atom. The coordination of either K⁺ cation is extended to a hexagonal bipyramid by a weak K⁺ → π\((C\dddot ---C)\) bond to two C atoms of the benzene ring of the adjacent ligand Db18C6. In the crystal, the complex anions and cations are united into infinite double chains through the above contacts and the interion hydrogen bonds O-H…Br.     

Triaqua(18-crown-6)strontium tetrachlorocuprate(II) hemihydrate: Synthesis and crystal structure

The new complex [Sr(18-crown-6)(H₂O)₃]²⁺[CuCl₄]^2? · 0.42H₂O was obtained; its crystal structure was determined by X-ray diffraction analysis: space group P2₁, a = 10.305 Å, b = 13.570 Å, c = 17.566 Å, β = 98.23 °, Z = 4 (direct method, anisotropic full-matrix least-squares method, R = 0.053 from independent reflections; CAD-4 automated diffractometer, λMoK _α). The asymmetric part of the unit cell comprises two independent “guest-host” complex cations [Sr(18-crown-6)(H₂O)₃]²⁺, two independent complex anions [CuCl₄]^2?, and a hydrate water molecule with a position population of 0.84(1).     

(18-Crown-6)sodium tribromide and (18-crown-6)potassium triiodide (with an admixture of bromodiiodide): Synthesis and crystal structure

Two crystalline host-guest complexes are synthesized and studied using X-ray diffraction analysis: (18-crown-6)sodium tribromide [Na(18-crown-6)]⁺ · Br ₃ ^? (I) and (18-crown-6)potassium tribromide (with an admixture of bromodiiodide) [K(18-crown-6)]⁺ · (Br_0.25I_2.75)^? (II). The structures of compound I (space group P2₁/_{n, a} = 8.957 Å, b = 8.288 Å, c = 14.054 Å, β = 104.80°, Z = 2) and compound II (space group Cc, a = 8.417 Å, b = 15.147 Å, c = 17.445 Å, β = 99.01°, Z = 4) are solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.098 (I) and 0.036 (II) for all 2311 (I) and 2678 (II) independent measured reflections on a CAD-4 automated diffractometer (λMoK _α). Similar crystalline complexes I and II exist as infinite chains of alternating complex cations and trihalide anions linked to each other through weak Na-Br or K-I coordination bonds. In [Na(18-crown-6)]⁺ and [K(18-crown-6)]⁺ complex cations, the Na⁺ or K⁺ cation (coordination number is eight) is located in the center of the cavity of the 18-crown-6 ligand and coordinated by the six O atoms and two terminal Br or I atoms of two trihalide anions lying on opposite sides of the rms plane of the crown ligand.     

Synthesis and crystal structure of dibenzo-18-crown-6 oxonium perchlorate

An ionized crystalline adduct of dibenzo-18-crown-6, perchloric acid, and water (H₃O)[DB 18K6](ClO₄) is synthesized and structurally studied by X-ray diffraction. The crystals are triclinic: a = 8.582 Å, b = 10.486 Å, c = 26.293 Å, α = 79.45°, β = 82.00°, γ = 79.36°, Z = 4, space group P \(\bar 1\). The structure is solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation to R = 0.098 for 5936 independent reflections (CAD4 automated diffractometer, λMoK _α radiation). The structure contains two independent DB18C6 molecules, two independent H₃O⁺ ions, and two independent ClO ₄ ^? ions. The H₃O⁺ ions each lie in the cavity of each of the two DB18C6 molecules and are retained there by three strong hydrogen bonds. Two DB18C6 molecules have close geometric parameters and a butterfly conformation with approximate symmetry C _2v . One of the two independent ClO ₄ ^? anions is disordered over two orientations.     

Synthesis and crystal structure of triaqua[0.25(bromo)1.75(nitrato-O)]copper(II) 18-crown-6 hydrate (solvate)

A complex triaqua[0.25(bromo)1.75(nitrato-O)]copper(II) 18-crown-6 hydrate (solvate), [CuBr_0.25(NO₃)_1.75(H₂O)₃] · 18-crown-6 · 5H₂O, is synthesized, and its crystal structure is studied by X-ray diffraction analysis (space group Cmc2₁, a = 13.705, b = 14.583, c = 13.174 Å, Z = 4; direct method, full-matrix least-squares refinement in the anisotropic approximation to R = 0.069 for 2547 independent reflections; CAD-4 automated diffractometer, λMoK _α radiation). The mixed complex molecule is a randomly disordered mixture of [Cu(NO₃)₂(H₂O)₃] and [CuBr(NO₃)(H₂O)₃] molecules with site occupancies of 0.875 and 0.125, respectively. The mixed complex molecule and 18-crown-6 molecule lie on the m plane. In the main complex molecule [Cu(NO₃)₂(H₂O)₃], the coordination polyhedron of the Cu²⁺ cation is a slightly distorted square pyramid. The 18-crown-6 molecule has the conformation of a crown with the approximate symmetry D _3d .     

α- and β-diphenylphosphorylated secondary alkanols: I. general method of synthesis and extraction properties towards <Emphasis Type="Italic">f</Emphasis>-elements

A simple and effective general method of synthesis of α- and β-diphenylphosphorylated secondary alkanols by the reduction of the corresponding phosphorylalkanones with NaBH4 was developed. The extraction properties of the resulting phosphorylalkanols Ph₂P(O)(CR₂)_nCH₂CH(OH)Me (n = 0, 1; R = H, Me) were studied in the recovery of f-elements (La^III, Nd^III, Ho^III, Yb^III, U^VI, Th^IV) from nitric acid solutions into chloroform and compared with those of both related phosphorylketones and known extractants (n-BuO)₃PO, (n-C₈H₁₇)₃PO, and Ph₂P(O)CH₂C(O)N(n-Bu)₂.     

Reactions of triphenylbenzylphosphonium and tetraphenylstibonium chlorides with potassium tetrachloroplatinates in dimethylsulfoxide

Platinum complexes [Ph₃PhCH₂P]⁺[(Me₂S=O)PtCl₃]^? I and cis-Cl₂(Ph₃Sb)(Me₂S=O)Pt II were synthesized by reaction of triphenylbenzylphosphonium and tetraphenylstibonium chlorides with potassium tetrachloroplatinate in DMSO. Crystal I is formed by triphenylbenzylphosphonium tetrahedral cations [P-C_Ph 1.791(4)-1.795(4) Å, P-C_Alk 1.811(4) Å; CPC 107.57(18)°-111.46(17)°] and by square anions [(Me₂S=O)PtCl₃]^? [Pt-Cl 2.3236(11), 2.2981(12), 2.2977(11) Å; Pt-S 2.1950(10) Å; trans-angles SPtCl 177.51(4)°, ClPtCl 178.74(4)°]. In a square-planar complex II [trans-angles SPtCl 178.01(6)°, ClPtSb 177.96(4)°] with central platinum atom the chlorine atoms [Pt-Cl 2.308(1), 2.350(1) Å], triphenylstibine [Pt-Sb 2.5118(4) Å] and dimethyl sulfoxide [Pt-S 2.195(1) Å] molecules are coordinated. Compound II is a first example of mixed ligand complex of platinum(II), where in the coordination sphere of central atom the tertiary stibine is present along with DMSO ligand.     

Nickel(II), cobalt(II), copper(II), and zinc(II) complexes with 4′-(4‴-benzo-15-crown-5)methyloxy-2,2′:6′,2″-terpyridine: Syntheses and vibrational spectra

Complexes of 4′-(4′″-benzo-15-crown-5)methyloxy-2,2′:6′,2″-terpyridine (L) with metal perchlorates and hexafluorophosphates, [ML₂](ClO₄)₂ · nH₂O and [ML₂](PF₆)₂ · nH₂O · mC₂H₅OH (M = Ni(II), Co(II), Zn(II), Cu(II); n = 0–3; m = 0–2), were synthesized. Their vibrational spectra were studied. The spectral criteria for ligand coordination through the terpyridinic nitrogen atoms were established. The conformational structure of the B15C5 macrocycles of a ligand molecule in the synthesized complexes was proposed. The complexes were studied by thermogravimetry.     

<Emphasis Type="Italic">catena</Emphasis>-(μ<Subscript>3</Subscript>-Bromo)di(μ<Subscript>2</Subscript>-bromo)bromo(18-crown-6)dilead(II): Synthesis and crystal structure

A new polymeric complex, catena-(μ₃-bromo)di(μ₂-bromo)bromo(18-crown-6)dilead(II), [Pb₂Br(μ₂-Br)₂(μ₃-Br)(18-crown-6)] _n (I), is synthesized, and its crystal structure is studied using X-ray diffraction analysis (space group P \(\bar 1\), a = 7.970, b = 16.048, c = 19.153 Å, α = 72.75°, β = 88.57°, γ = 87.92°, Z = 4, direct method, full-matrix least-squares method in the anisotropic approximation, R = 0.076 for 6093 independent reflections, CAD4 automated diffractometer, λMoK_α radiation). The crystal structure of complex I contains infinite chains of the PbBr₆ octahedra along the x axis with the bridging Br^? anions as common edges. The [PbBr(18-crown-6)]⁺ host-guest complex fragments are attached through weak Pb-Br bonds to these chains on the side. In two independent terminal fragments, the coordination polyhedra of the Pb²⁺ cations are distorted hexagonal bipyramids with bases of six O atoms of the crown ligand and two Br^? anions in the axial vertices. Two Pb²⁺ cations from the [PbBr₃] _n ^? infinite polymer chain have a distorted octahedral coordination.     

Neodymium(III) triaquatrihydroxo(1,3-diamino-2-propanoltetraacetato)germanium(IV) hydrate [Ge(OH)(μ-HHpdta)(μ-OH)Nd(OH)(H<Subscript>2</Subscript>O)<Subscript>3</Subscript>] · H<Subscript>2</Subscript>O: Synthesis and crystal and molecular structure

The heteronuclear germanium(IV) and neodymium(III) complex with 1,3-diamino-2-propanoltetraacetic acid (H₅Hpdta) [Ge(OH)(μ-HHpdta)(μ-OH)Nd(OH)(H₂O)₃] · H₂O has been synthesized for the first time and characterized by physicochemical methods (elemental analysis, X-ray powder diffraction, thermogravimetry, IR spectroscopy, X-ray crystallography). The crystals are monoclinic: a = 9.331(3) Å, b= 10.279(4) Å, c = 21.474(7) Å, β = 94.59(3)°, V = 2053.0(12) ų, Z = 4, space group P2₁/n, R1 = 0.0245 for 4060 reflections with I > 2σ(I). The compound is built of complex binuclear molecules [Ge(OH)(μ-HHpdta)(μ-OH)Nd(OH)(H₂O)₃] and water molecules of crystallization. The germanium and neodymium atoms are bridged by the oxygen atom of the hydroxo group (Ge-O, 1.798(2) Å; Nd-O, 2.539(2) Å) and the deprotonated oxygen atom of the isopropanol group of the HHpdta^4? ligand (Fe-O, 1.858(2)Å; Nd-O, 2.420(2) Å) to form a dimeric molecule. Each coordination sphere (of the Ge atom and of the Nd atom) contains one nitrogen atom (Ge-N, 2.096(3) Å; Nd-N, 2.807(2) Å) and two carboxylic oxygen atoms from four acetate branches of the octadentate HHpdta^4? ligand (av. Ge-O, 1.928(2) Å; Nd-O, 2.391(2) Å). The coordination polyhedron of the Ge atom is completed to a distorted octahedron by the oxygen atom of the terminal hydroxo group (Ge-O 1.811(2) Å), and the polyhedron of the Nd atom is completed to a nine-vertex polyhedron by the oxygen atoms of the terminal hydroxo group (Nd-O 2.494(3) Å) and three water molecules (Nd-O, 2.512(3), 2.520(3), and 2.723(3) Å). In the crystal structure, the complex molecules and the water molecules of crystallization are joined by a hydrogen bond system.