Die folgende Antwort geht davon aus, dass das Problem tatsächlich lediglich der Nickel-Komplex ist und nicht das gesamte Schema.
Der einzige etwas kompliziertere Teil ist IMHO, das Nickel in die Mitte zu platzieren – ich vermute Mal, dass das auch der springende Punkt ist, der Probleme bereitet. Der Rest ist einfach eine lange Kette, die sich irgendwann in den Schwanz beißt.
Fangen wir bei der linken unteren Methylgruppe an:
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Das war das erste Viertel. Und eigentlich geht es genauso weiter:
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Schon sind wir beim dritten Stickstoff… Noch ein bisschen mehr:
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Jetzt fehlt nur noch das Nickel. Dazu platzieren wir an den zweiten bis vierten Stickstoff je einen Anker (?[a]
, ?[b]
und ?[c]
). Diese Anker ermöglichen später, die verschiedenen Stickstoffe mit dem Nickel zu verbinden:
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Vom ersten Stickstoff aus platzieren wir das Nickel (Winkel und Bindungslänge erhält man mit ein bisschen Trigonometrie. Die Bindungslänge ergibt sich zu $\sqrt{7}/2 \approx 1.323$
, der Winkel zu $\arcsin(2/\sqrt{2}) \approx 49.1^\circ$
):
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Und zu guter Letzt verbinden wir das Nickel mit den Ankern:
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beantwortet
17 Feb '16, 23:07
cgnieder
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