title: Structural and thermodiffractometric analysis of coordination polymers. Part I: tin derivatives of the Bim ligand [Bim = Bis(1-imidazolyl)methane]).
abstract: New polynuclear coordination species containing the ditopic bis(1-imidazolyl)methane (Bim) ligand have been prepared as microcrystalline powders and structurally characterized by ab initio X-ray powder diffraction methods. [Bim(Me2SnCl2)]n (1), [Bim(nBu2SnCl2)]n (3), [Bim(Ph2SnCl2)]n (4), [Bim(MeSnCl3)]n (5), and [Bim(PhSnCl3)]n (6) all contain 1D chains with octahedral tin atoms with trans N-Sn-N linkages (but 4, which displays a cis N-Sn-N linkage). Their thermodiffractometric analysis allowed the estimation of the linear thermal expansion coefficients and strain tensors derived there from. The potential-energy surface of the free Bim ligand (as defined by two torsional degrees of freedom about the two N-CH2 bonds), eventually controlling the length of the repeating unit (polymer elongation), has been estimated using molecular mechanics and correlated with experimental observations.
authors.affiliation: Dipartimento di Scienze Chimiche e Ambientali, Università dell'Insubria, via Valleggio 11, 22100 Como, Italy.
authors.forename: Norberto
authors.initials: N
authors.lastname: Masciocchi
authors.forename: Claudio
authors.initials: C
authors.lastname: Pettinari
authors.forename: Enrica
authors.initials: E
authors.lastname: Alberti
authors.forename: Riccardo
authors.initials: R
authors.lastname: Pettinari
authors.forename: Corrado Di
authors.initials: CD
authors.lastname: Nicola
authors.forename: Alessandro Figini
authors.initials: AF
authors.lastname: Albisetti
authors.forename: Angelo
authors.initials: A
authors.lastname: Sironi