Publications

  1. Kaisa Helttunen, Riia Annala, Aku Suhonen, Juho Iloniemi, Elina Kalenius, Gemma Aragay, Pablo Ballester, Heikki M. Tuononen, Maija Nissinen
    Oligoamide foldamers as helical chloride receptors – the influence of electron withdrawing substituents on anion binding interactions
    Chem. Asian J., 2019, 14, 647-654. doi:10.1002/asia.201801869 Graphical Abstract The incorporation of electron‐withdrawing substituents in aryl amide foldamers stabilizes the formation of 1:2 host–guest complexes with chloride anions.
  2. Kaisa Helttunen, Riia Annala, Aku Suhonen, Elisa Nauha, Juha Linnanto, Maija Nissinen
    Supramolecular chirality and symmetry breaking of fluoride complexes of achiral foldamers
    CrystEngComm, 2017, 19, 5184-5187. doi:10.1039/C7CE01109A Graphical Abstract Fluoride binding of achiral oligoamide foldamers produces polar and chiral crystal structures and induces exceptional symmetry breaking of the bulk sample.
  3. Kaisa Helttunen, Maija Nissinen
    Inverted molecular cups: 1-D and 2-D Ag(I) coordination polymers from resorcinarene bis-thiacrowns
    CrystEngComm, 2016, 18, 4944-4951. doi:10.1039/c6ce00243a Graphical Abstract Exo-cavity binding into resorcinarene based inverted molecular cups creates 1-D and 2-D silver coordination polymers with argentophilic interactions.
  4. Kaisa Helttunen, Albano Galán, Pablo Ballester, Johan Bergenholtz, Maija Nissinen
    Solid lipid nanoparticles from amphiphilic calixpyrroles
    J. Colloid Interface Sci., 2016, 464, 59-65. doi:10.1016/j.jcis.2015.11.012
  5. Aku Suhonen, Ian S. Morgan, Elisa Nauha, Kaisa Helttunen, Heikki M. Tuononen, Maija Nissinen
    The effect of a rigid sulfonamide bond on molecular folding: a case study
    Cryst. Growth Des., 2015, 15, 2602–2608. doi:10.1021/acs.cgd.5b00424
  6. Kaisa Helttunen, Tiia-Riikka Tero, Maija Nissinen
    Influence of lower rim C-methyl group on crystal forms and metal complexation of resorcinarene bis-crown-5
    CrystEngComm, 2015, 17, 3667–3676. doi:10.1039/C5CE00311C
  7. Ludovico G. Tulli, Negar Moridi, Wenjie Wang, Kaisa Helttunen, Markus Neuburger, David Vaknin, Wolfgang Meier, Patrick Shahgaldian
    Polymorphism control of an active pharmaceutical ingredient beneath calixarene-based Langmuir monolayers
    Chem. Commun., 2014, 50, 3938-3940. doi:10.1039/C4CC00928B
  8. Kaisa Helttunen, Lauri Lehtovaara, Hannu Häkkinen, Maija Nissinen
    Crystal structures and density functional theory calculations of o- and p-nitroaniline derivatives: combined effect of hydrogen bonding and aromatic interactions on dimerization energy
    Cryst. Growth Des., 2013, 13, 3603-3612. doi:10.1021/CG4005714
  9. Aku Suhonen, Elisa Nauha, Kirsi Salorinne, Kaisa Helttunen, Maija Nissinen
    Structural analysis of two foldamer-type oligoamides - the effect of hydrogen bonding on solvate formation, crystal structures and molecular conformation
    CrystEngComm, 2012, 14, 7398-7407. doi:10.1039/C2CE25981H
  10. Kaisa Helttunen, Negar Moridi, Patrick Shahgaldian, Maija Nissinen
    Resorcinarene bis-crown silver complexes and their application as antibacterial Langmuir-Blodgett films Ph.D. Thesis
    Org. Biomol. Chem., 2012, 10, 2019-2025. doi:10.1039/C2OB06920B
  11. Kaisa Helttunen, Kirsi Salorinne, Tahnie Barboza, Hélène Campos Barbosa, Aku Suhonen, Maija Nissinen
    Cation binding resorcinarene bis-crowns: the effect of lower rim alkyl chain length on crystal packing and solid lipid nanoparticles Ph.D. Thesis
    New J. Chem, 2012, 36, 789-795. doi:10.1039/C2NJ20981K
  12. Kaisa Helttunen, Elisa Nauha, Anni Kurronen, Patrick Shahgaldian, Maija Nissinen
    Conformational polymorphism and amphiphilic properties of resorcinarene octapodands Ph.D. Thesis
    Org. Biomol. Chem., 2011, 9, 906-914. doi:10.1039/C0OB00602E
  13. Kaisa Helttunen, Patrick Shahgaldian
    Self-assembly of amphiphilic calixarenes and resorcinarenes in water Ph.D. Thesis
    New J. Chem., 2010, 34, 2704-2714 (perspective article). doi:10.1039/C0NJ00123F
  14. Kaisa Helttunen, Piotr Prus, Minna Luostarinen, Maija Nissinen
    Interaction of aminomethylated resorcinarenes with rhodamine B Ph.D. Thesis
    New J. Chem., 2009, 33, 1148-1154. doi:10.1039/B820409H
  15. Vesa P. Hytönen, Juha A.E. Määttä, Einari A. Niskanen, Juhani Huuskonen, Kaisa J. Helttunen, Katrin K. Halling, Henri R. Nordlund, Kari Rissanen, Mark S. Johnson, Tiina A. Salminen, Markku S. Kulomaa, Olli H. Laitinen, Tomi T. Airenne
    Structure and characterization of a novel chicken biotin-binding protein A (BBP-A)
    BMC Structural Biology, 2007, 7. doi:10.1186/1472-6807-7-8
  16. Vesa P. Hytönen, Jarno Hörhä, Tomi T. Airenne, Einari A. Niskanen, Kaisa J. Helttunen, Mark. S. Johnson, Tiina A. Salminen, Markku S. Kulomaa, Henri R. Nordlund
    Controlling quaternary structure assembly: subunit interface engineering and crystal structure of dual chain avidin
    J. Mol. Biol., 2006, 359, 1352-1363. doi:10.1016/j.jmb.2006.04.044