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Crystal and Molecular Structure of the Cyclodimeric Propylene-1,3-phenylenediacetate and of Its Di-n-butyltin Dichloride Complex

Paolo Dapporto ; Dipartimento di Energetica »Sergio Stecco«, Università di Firenze, I-50139 Firenze, Italy
Stefano Roelens ; CNR, Centro di Studio sulla Chimica e la Struttura dei Composti Eterociclici e loro Applicazioni, Dipartimento di Chimica Organica, Università di Firenze, I-50121 Firenze, Italy
Patrizia Rossi ; Dipartimento di Energetica »Sergio Stecco«, Università di Firenze, I-50139 Firenze, Italy


Puni tekst: engleski pdf 115 Kb

str. 327-340

preuzimanja: 334

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Sažetak

As part of a systematic Study on the synthesis and binding properties of a series of cyclophane ester hosts, the crystal structures of the cyclodimeric propylene-1,3-phenylenediacetate (C26H28O8) and of its di-n-butyltin dichloride complex {(C26H26O8) [SnCl2(C4H9)2]2} have been determined by X-ray analyses. The crystals of the free macrocycle are triclinic, space group P1̅, with a = 5.071(6), b = 8.108(3), c = 14.640(4) Å, α = 76.46(3), β = 85.35(8), γ= 86.04(7)°, Z = 1. Similarly, the crystals of the complex belong to the P1̅ space group of the triclinic system and have the following cell parameters: a = 8.378(4), b = 11.524(3), c = 14.009(4) Å, α = 109.16(2), β = 92.64(2), γ= 100.93(3)°, Z= 1. The most important feature of the complex structure is represented by the unambiguous interaction between two cyclophane ester carbonyls and two molecules of Bu2SnCl2, the distance being 2.865(4) Å. The usual tetrahedral geometry of the organotin(IV) center is significantly influenced by the interaction, changing into a distorted trigonal bipyramid, with a longer apical distance, typical of the five-coordinate stannate complexes. Conformations of the cyclophane in the two structures have been analyzed in some detail.

Ključne riječi

tin complex; X-ray structure; cyclophane derivatives

Hrčak ID:

132175

URI

https://hrcak.srce.hr/132175

Datum izdavanja:

1.9.1999.

Posjeta: 640 *