Alkaline-earth metal fluoroalkoxide complexes with multi-coordinated polyether appendage: synthesis and characterization

Yun Chi; Sudhir Ranjan; Po-Wen Chung; Hsi-Ying Hsieh; Shie-Ming Peng; Gene-Hsiang Lee

doi:10.1016/S0020-1693(02)00860-5

Alkaline-earth metal fluoroalkoxide complexes with multi-coordinated polyether appendage: synthesis and characterization

Yun Chi, Sudhir Ranjan, Po-Wen Chung, Hsi-Ying Hsieh, Shie-Ming Peng, Gene-Hsiang Lee

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

19 Citations (Scopus)

Abstract

Four alkaline-earth metal alkoxide complexes of formula [M(meak)₂] (1, M=Sr; 2, M=Ba) and [M(biak)₂]₂ (3, M= Sr; 4, M=Ba) were synthesized by the reaction of polyether substituted flouroalcohols, (meak)H=HOC(CF₃)₂CH₂(OCH₂CH₂)₂OMe and (biak)H=HOC(CF₃)₂CH₂OCH₂CH₂N(CH₂CH₂OMe)₂, with metal source reagents Sr(OPrⁱ)₂ and BaH₂, respectively. These complexes were characterized by ¹H and ¹⁹F NMR spectroscopies and single crystal X-ray diffraction studies. The coordination geometry of 1 is best described as distorted trigonal dodecahedron, while complex 2 shows a similar coordination geometry, but possesses a H₂O solvate linked to the alkoxy oxygen atom of the chelating meak ligands through H-bonding. Complexes [Sr(biak)₂]₂ (3) and [Ba(biak)₂]₂ (4) exist as dimers in the solid state in which the metal centers are linked by two bridging alkoxy oxygen atoms and encapsulated by a total of nine heteroatoms composed of a distorted tricapped trigonal prismatic geometry. Variable temperature ¹⁹F NMR studies of all complexes show simultaneous existence of two isomers in solution. Pyrolysis of these four complexes in air affords the expected SrF₂ and BaF₂ powders.

Original language	English
Pages (from-to)	172-182
Journal	Inorganica Chimica Acta
Volume	334
Online published	11 Apr 2002
DOIs	https://doi.org/10.1016/S0020-1693(02)00860-5
Publication status	Published - 30 May 2002
Externally published	Yes

Research Keywords

Alkaline-earth metal complexes
Crystal structures
Fluoroalkoxide complexes
Polyether complexes

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title = "Alkaline-earth metal fluoroalkoxide complexes with multi-coordinated polyether appendage: synthesis and characterization",

abstract = "Four alkaline-earth metal alkoxide complexes of formula [M(meak)2] (1, M=Sr; 2, M=Ba) and [M(biak)2]2 (3, M= Sr; 4, M=Ba) were synthesized by the reaction of polyether substituted flouroalcohols, (meak)H=HOC(CF3)2CH2(OCH2CH2)2OMe and (biak)H=HOC(CF3)2CH2OCH2CH2N(CH2CH2OMe)2, with metal source reagents Sr(OPri)2 and BaH2, respectively. These complexes were characterized by 1H and 19F NMR spectroscopies and single crystal X-ray diffraction studies. The coordination geometry of 1 is best described as distorted trigonal dodecahedron, while complex 2 shows a similar coordination geometry, but possesses a H2O solvate linked to the alkoxy oxygen atom of the chelating meak ligands through H-bonding. Complexes [Sr(biak)2]2 (3) and [Ba(biak)2]2 (4) exist as dimers in the solid state in which the metal centers are linked by two bridging alkoxy oxygen atoms and encapsulated by a total of nine heteroatoms composed of a distorted tricapped trigonal prismatic geometry. Variable temperature 19F NMR studies of all complexes show simultaneous existence of two isomers in solution. Pyrolysis of these four complexes in air affords the expected SrF2 and BaF2 powders.",

keywords = "Alkaline-earth metal complexes, Crystal structures, Fluoroalkoxide complexes, Polyether complexes",

author = "Yun Chi and Sudhir Ranjan and Po-Wen Chung and Hsi-Ying Hsieh and Shie-Ming Peng and Gene-Hsiang Lee",

year = "2002",

month = may,

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doi = "10.1016/S0020-1693(02)00860-5",

language = "English",

volume = "334",

pages = "172--182",

journal = "Inorganica Chimica Acta",

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TY - JOUR

T1 - Alkaline-earth metal fluoroalkoxide complexes with multi-coordinated polyether appendage

T2 - synthesis and characterization

AU - Chi, Yun

AU - Ranjan, Sudhir

AU - Chung, Po-Wen

AU - Hsieh, Hsi-Ying

AU - Peng, Shie-Ming

AU - Lee, Gene-Hsiang

PY - 2002/5/30

Y1 - 2002/5/30

N2 - Four alkaline-earth metal alkoxide complexes of formula [M(meak)2] (1, M=Sr; 2, M=Ba) and [M(biak)2]2 (3, M= Sr; 4, M=Ba) were synthesized by the reaction of polyether substituted flouroalcohols, (meak)H=HOC(CF3)2CH2(OCH2CH2)2OMe and (biak)H=HOC(CF3)2CH2OCH2CH2N(CH2CH2OMe)2, with metal source reagents Sr(OPri)2 and BaH2, respectively. These complexes were characterized by 1H and 19F NMR spectroscopies and single crystal X-ray diffraction studies. The coordination geometry of 1 is best described as distorted trigonal dodecahedron, while complex 2 shows a similar coordination geometry, but possesses a H2O solvate linked to the alkoxy oxygen atom of the chelating meak ligands through H-bonding. Complexes [Sr(biak)2]2 (3) and [Ba(biak)2]2 (4) exist as dimers in the solid state in which the metal centers are linked by two bridging alkoxy oxygen atoms and encapsulated by a total of nine heteroatoms composed of a distorted tricapped trigonal prismatic geometry. Variable temperature 19F NMR studies of all complexes show simultaneous existence of two isomers in solution. Pyrolysis of these four complexes in air affords the expected SrF2 and BaF2 powders.

AB - Four alkaline-earth metal alkoxide complexes of formula [M(meak)2] (1, M=Sr; 2, M=Ba) and [M(biak)2]2 (3, M= Sr; 4, M=Ba) were synthesized by the reaction of polyether substituted flouroalcohols, (meak)H=HOC(CF3)2CH2(OCH2CH2)2OMe and (biak)H=HOC(CF3)2CH2OCH2CH2N(CH2CH2OMe)2, with metal source reagents Sr(OPri)2 and BaH2, respectively. These complexes were characterized by 1H and 19F NMR spectroscopies and single crystal X-ray diffraction studies. The coordination geometry of 1 is best described as distorted trigonal dodecahedron, while complex 2 shows a similar coordination geometry, but possesses a H2O solvate linked to the alkoxy oxygen atom of the chelating meak ligands through H-bonding. Complexes [Sr(biak)2]2 (3) and [Ba(biak)2]2 (4) exist as dimers in the solid state in which the metal centers are linked by two bridging alkoxy oxygen atoms and encapsulated by a total of nine heteroatoms composed of a distorted tricapped trigonal prismatic geometry. Variable temperature 19F NMR studies of all complexes show simultaneous existence of two isomers in solution. Pyrolysis of these four complexes in air affords the expected SrF2 and BaF2 powders.

KW - Alkaline-earth metal complexes

KW - Crystal structures

KW - Fluoroalkoxide complexes

KW - Polyether complexes

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U2 - 10.1016/S0020-1693(02)00860-5

DO - 10.1016/S0020-1693(02)00860-5

M3 - RGC 21 - Publication in refereed journal

SN - 0020-1693

VL - 334

SP - 172

EP - 182

JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

ER -

Alkaline-earth metal fluoroalkoxide complexes with multi-coordinated polyether appendage: synthesis and characterization

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