title: Series of dicyanamide-interlaced assembly of zinc-Schiff-base complexes: crystal structure and photophysical and thermal studies.
abstract: Four new dicyanamide (dca) bridged multinuclear Zn(II)-Schiff-base complexes, {[Zn2L(1)(μ1,5-dca)dca]·CH3OH}2 (1), [Zn2L(2)(μ1,5-dca)dca]n (2), [Zn3L(3)2(μ1,5-dca)2]n (3), and [(ZnL(4))2Zn(μ1,5-dca)dca]n (4), have been synthesized using four different Schiff bases L(1)H2 = N,N(/)-bis(3-methoxysalicylidenimino)-1,3-diaminopentane, L(2)H2 = N,N'-bis(5-bromo-3-methoxysalicylidenimino)-1,3-diaminopropane, L(3)H2 = N,N'-bis(5-bromosalicylidenimino)-1,3-diaminopropane, and L(4)H2 = N,N'-bis(5-chlorosalicylidenimino)-1,3-diaminopropane and NaN(CN)2 in order to extend the metal-ligand assembly. The directional properties of linear end-to-end bridging dca ligands have resulted in different metal ion connectivities leading to unique variety of templates in each of the complexes. All the ligands and complexes have been characterized by microanalytical and spectroscopic techniques. The structures of the complexes have been conclusively determined by single crystal X-ray diffraction studies. Thermogravimetric analyses have been performed to investigate the thermal stability of the metal-organic frameworks. Finally, the photoluminescence properties of the complexes as well as their respective ligands have been investigated with a comparative approach.
authors.affiliation: Department of Chemistry, Jadavpur University , Raja S. C. Mullick Road, Kolkata 700032, West Bengal, India.
authors.forename: Monami
authors.initials: M
authors.lastname: Maiti
authors.forename: Dipali
authors.initials: D
authors.lastname: Sadhukhan
authors.forename: Santarupa
authors.initials: S
authors.lastname: Thakurta
authors.forename: Syamantak
authors.initials: S
authors.lastname: Roy
authors.forename: Guillaume
authors.initials: G
authors.lastname: Pilet
authors.forename: Ray J
authors.initials: RJ
authors.lastname: Butcher
authors.forename: Aline
authors.initials: A
authors.lastname: Nonat
authors.forename: Loïc J
authors.initials: LJ
authors.lastname: Charbonnière
authors.forename: Samiran
authors.initials: S
authors.lastname: Mitra
mesh_terms: D018360:Crystallography, X-Ray; D003484:Cyanamide / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D055668:Photochemical Processes; D012545:Schiff Bases / Q000737:chemistry*; D013696:Temperature; D015032:Zinc / Q000737:chemistry*
chemical_list: D009942:Organometallic Compounds; D012545:Schiff Bases; D003484:Cyanamide; D015032:Zinc